Silicone Plug

Our factory supplies premium custom silicone plug (silicone stopper / silicone rubber plug / silicone bung) solutions for food-grade and industrial-grade applications across laboratory, food & beverage, automotive, electronics, plumbing and industrial sectors. Made from 100% virgin silicone rubber with precise durometer control, superior high/low temperature resistance, excellent aging & ozone resistance, high elasticity and reliable waterproof/airtight/fluid-tight sealing performance, these silicone plugs feature a tapered/stepped conical design that fits a range of opening sizes, an integrated pull tab/handle for easy removal, and full customizability in size, shape, hardness, color and surface finish - engineered to meet the exact sealing and capping requirements of test tubes, bottles, pipes, holes, enclosures and equipment. A safe, durable and high-performance sealing solution that outperforms traditional rubber, cork, plastic, glass and metal stoppers.

Full parameters are listed in the table below:

The silicone plug - also known as a silicone stopper, silicone bung or silicone rubber plug - is one of the most versatile and widely used sealing components across laboratory, food, medical, automotive, electronics, plumbing and industrial applications. Its function is simple but essential: insert into an opening (test tube, bottle, pipe, hole, port, enclosure) to create a reliable seal that prevents the leakage of liquids, gases or vapors, keeps contaminants out, and maintains pressure or vacuum inside the vessel. Despite this simple function, choosing the wrong stopper material can lead to costly failures - leaks that contaminate samples or products, stoppers that pop out under pressure, materials that degrade from heat or chemicals, or stoppers that become stuck and impossible to remove. Traditional stopper materials each have significant drawbacks. Rubber stoppers (natural rubber, nitrile, SBR) are elastic and cheap but have limited temperature range (typically -30℃ to +120℃), are susceptible to ozone cracking and UV degradation, can have a strong rubber odor that contaminates samples or food, may contain curing agents or plasticizers that leach into contents, and can harden and lose elasticity with age. Cork stoppers are traditional and biodegradable but absorb liquids (wine, chemicals, water), can crumble and leave residue, are not reusable (expand permanently after insertion), cannot withstand high temperatures or autoclaving, and can harbor bacteria or mold. Plastic stoppers (PE, PP, nylon, PTFE) are lightweight and chemical-resistant but have poor elasticity (do not conform well to irregular openings), can become brittle at low temperatures, may melt or deform at high temperatures, and can crack under impact or overtightening. Glass stoppers are inert and heat-resistant but heavy, extremely fragile (easy to break - especially dangerous in laboratory settings with chemicals), can become permanently stuck (glass-on-glass seizure), and are not suitable for pressure or vacuum applications. Metal stoppers (aluminum, stainless steel, brass) are durable and heat-resistant but heavy, can corrode or gall, do not provide a compliant seal (require gaskets), can scratch or damage delicate openings, and are not suitable for glassware. Our silicone plugs address every one of these shortcomings with a material that offers an unmatched combination of temperature resistance, elasticity, durability, chemical stability, non-stick surface and sealing reliability - plus thoughtful design features like tapered conical shape and integrated pull tabs.

Crafted from 100% virgin silicone rubber (VMQ), our plugs offer exceptional performance across a wide range of demanding environments. The standard temperature range of -60℃ to +230℃ covers virtually all laboratory, food, industrial and automotive applications - with high-temperature grades available up to +260℃ and low-temperature grades down to -80℃ for extreme environments. Unlike rubber stoppers that harden and crack at high temperatures, or cork that disintegrates, silicone maintains its elasticity and sealing performance even after prolonged exposure to heat, cold, ozone and UV radiation - and can be autoclaved repeatedly for laboratory sterilization. The high elasticity and low compression set (less than 15% at 70℃ x 22h) ensure that the plug retains its sealing force even after years of compression - and unlike cork that expands permanently, silicone returns to its original shape after removal, making it fully reusable. The tapered conical design is one of the most practical features - a single plug can fit a range of opening sizes (the taper allows it to seat at different depths), eliminating the need for exact-size matching and providing a self-tightening seal (the more pressure inside, the tighter the seal). The integrated pull tab/handle/ring makes removal effortless - no more stuck stoppers, no need for tools, and no risk of breaking glassware while trying to extract a stubborn plug. Silicone is also inherently food-safe - our food-grade formulations comply with FDA 21 CFR 177.2600 and LFGB standards, making them ideal for food and beverage applications, brewing equipment and kitchen use. For medical and laboratory applications, our medical-grade silicone is biocompatible per ISO 10993 and autoclavable. The non-porous, non-stick silicone surface does not absorb liquids, odors or contaminants - unlike cork that absorbs wine and chemicals, or rubber that retains odors - making it easy to clean and sanitize, and preventing cross-contamination between uses. The material is also an excellent electrical insulator (dielectric strength 20kV/mm), making it ideal for electronic and electrical applications. Every plug is fully customizable - we can produce virtually any size (from 1mm diameter for micro-vials to 200mm for large pipes), any shape (tapered, stepped, cylindrical, flanged, T-shape, with through-hole, with pull tab), any hardness (20A to 80A Shore A), and any color - with precision tolerances down to ±0.05mm. This level of customization, combined with material performance that outperforms traditional stopper materials, makes our silicone plugs the preferred choice for laboratories, food processors, medical device manufacturers, automotive OEMs, electronics companies and industrial maintenance teams worldwide.

Core Selling Points

This page emphasizes 100% virgin silicone material + tapered conical multi-size fit + integrated pull tab for easy removal + extreme temperature resistance & autoclavability + high elasticity & reusability + food-grade/medical-grade/industrial-grade formulations + full customizability as the differentiated selling angle.

Tapered conical design, one plug fits a range of opening sizes: The most distinctive and practical feature of our silicone plugs is the tapered conical (frustum) shape. Unlike cylindrical plugs that require an exact diameter match (and can be too loose or too tight if the opening is slightly off-size), the tapered design allows a single plug to fit a range of opening sizes - the plug seats at different depths depending on the opening diameter, creating a secure seal at any point along its tapered body. This self-adjusting fit eliminates the need for exact-size matching, reduces the number of SKUs you need to stock, and provides a forgiving seal even for openings that are slightly irregular, out-of-round or worn. The taper also creates a self-tightening seal - as internal pressure increases (from heating, fermentation or vacuum), the plug is pushed deeper into the opening, increasing the sealing force rather than popping out. This is a critical advantage over cylindrical stoppers that can be pushed out by internal pressure, or cork stoppers that can blow out of carbonated bottles. The tapered design also makes insertion easy - simply push the plug into the opening until it seats firmly, no twisting or forcing required. We offer taper angles from 2° to 15° - shallow tapers (2°-5°) for precise, deep insertion and maximum seal contact; medium tapers (5°-10°) for general-purpose use; and steep tapers (10°-15°) for quick insertion and removal, or for openings with significant size variation. For applications requiring a specific depth or shoulder stop, we offer stepped/shouldered plugs with a defined flange that limits insertion depth. Standard lab stopper sizes (#00 through #10) cover openings from 6mm to 80mm, and custom sizes are available for openings up to 200mm.

Integrated pull tab/handle, effortless removal without tools or breakage: One of the most common frustrations with traditional stoppers is removal - cork stoppers can break during extraction (requiring a corkscrew), rubber stoppers can become stuck and require prying with tools (risking damage to the vessel or injury), glass stoppers can seize permanently (glass-on-glass adhesion), and plastic stoppers can be difficult to grip when wet or slippery. Our silicone plugs solve this problem with an integrated pull tab/handle/ring that is molded as part of the plug - no separate parts, no adhesives, no weak points. The pull tab provides a secure, non-slip grip that allows you to remove the plug with a simple pull - even when wearing gloves, when the plug is wet, or when your hands are slippery (common in laboratory, food processing and industrial settings). The pull tab also serves as a visual indicator that the plug is properly seated, and can be color-coded for size identification or content labeling. For applications where a low-profile plug is required (flush-mount, space-constrained), we offer plugs with a recessed pull tab, a finger-loop ring, or a T-shape handle that sits flush with the surface. For through-hole applications (tubing pass-through, electrode feed-through), we offer plugs with a precision-drilled center hole that accommodates tubing or probes while maintaining a seal around the pass-through. The integrated pull tab is made from the same high-strength silicone as the plug body - it can withstand repeated pulling (thousands of cycles) without tearing or breaking, and maintains its shape and flexibility over the entire service life of the plug. This thoughtful design feature significantly improves user experience and safety - no more broken glassware, no more stuck stoppers, no more tools required for removal.

Extreme temperature resistance & autoclavability, stable from -60℃ to +230℃: Silicone plugs offer exceptional temperature resistance that outperforms all traditional stopper materials. Standard silicone plugs maintain their elasticity and sealing performance across a temperature range of -60℃ to +230℃ (-76℉ to +446℉) - a range that covers virtually all laboratory, food, industrial and automotive applications. For extreme environments, high-temperature grades are available up to +260℃ (+500℉) and low-temperature grades down to -80℃ (-112℉). This is in stark contrast to: rubber stoppers (typically -30℃ to +120℃, harden and crack at higher temperatures); cork stoppers (degrade above 120℃, cannot be autoclaved); plastic stoppers (PE/PP melt at 120-160℃, become brittle at low temperatures); and glass stoppers (can shatter from thermal shock). One of the most important temperature-related benefits for laboratory and medical applications is autoclavability - our silicone plugs can be repeatedly autoclaved at 121℃ (250℉) / 15 psi for 20-30 minutes without degradation, hardening or loss of elasticity. This makes them ideal for sterile laboratory applications (test tubes, culture tubes, media bottles) and medical device sterilization - where cork and many plastic stoppers cannot withstand autoclaving, and rubber stoppers degrade after repeated autoclave cycles. For food and beverage applications, the high temperature resistance means the plugs can be used with hot liquids (hot filling, pasteurization, brewing) without melting or deforming - and can be cleaned in dishwashers or boiling water. For automotive and industrial applications, the wide temperature range means the plugs can be used in engine compartments (hot), outdoor equipment (cold winters), and cryogenic systems (extreme cold) without material failure. Silicone also has excellent thermal stability - it does not soften excessively at high temperatures or become brittle at low temperatures, maintaining consistent sealing force and easy insertion/removal across the entire temperature range.

High elasticity & reusability, non-porous non-stick surface prevents contamination: A stopper's ability to create and maintain a seal depends on its elasticity - its ability to conform to the opening shape and return to its original form after compression. Our silicone plugs feature high elasticity (elongation at break 200-600%, tensile strength 5-10 MPa) and exceptionally low compression set (less than 15% at 70℃ x 22h per ASTM D395), meaning the plug conforms tightly to the opening (even if slightly irregular or out-of-round) and returns to its original shape after removal - making it fully reusable. This is a critical advantage over cork stoppers, which expand permanently after insertion (the cork cells crush and do not recover) and are single-use; over plastic stoppers, which have high compression set and can deform permanently; and over rubber stoppers, which can harden and lose elasticity with age. The reusability of silicone plugs reduces long-term costs and waste - a single silicone plug can be used hundreds or thousands of times, replacing dozens of disposable cork or plastic stoppers. Equally important is the non-porous, non-stick silicone surface - unlike cork, which is porous and absorbs liquids (wine, chemicals, blood, media), odors and contaminants (and can harbor bacteria or mold), and unlike rubber, which can absorb oils and odors, silicone is completely non-porous. It does not absorb anything - liquids bead on the surface, odors do not penetrate, and contaminants can be easily wiped or washed away. This makes silicone plugs ideal for: laboratory applications (no cross-contamination between samples, no absorption of reagents or media); food and beverage applications (no absorption of flavors, oils or odors - a plug used for wine can be washed and used for oil without flavor transfer); medical applications (no absorption of bodily fluids or medications, easy sterilization); and industrial applications (no absorption of oils, fuels or chemicals). The non-stick surface also means the plug does not adhere to glass, plastic or metal openings - unlike glass stoppers that can seize to glass joints, or rubber stoppers that can stick to openings after prolonged contact. Removal is always smooth and effortless.

Food-grade & medical-grade safety, FDA/LFGB/ISO 10993 compliant & fully customizable: One of the most important differentiators of silicone plugs is their availability in food-grade and medical-grade formulations that meet the world's most stringent safety standards - combined with full customizability to meet your exact requirements. Food-grade: our food-grade silicone plugs comply with FDA 21 CFR 177.2600 (United States) and LFGB (Germany/Europe) food-contact standards - making them safe for direct contact with food and beverages in wine bottles, oil/vinegar bottles, condiment bottles, brewing equipment, fermentation vessels, water bottles and kitchen appliances. The food-grade silicone is non-toxic, odorless and tasteless - it will not alter the flavor, aroma or quality of food or beverages. Unlike cork stoppers that can impart a "corky" flavor (cork taint from TCA), or rubber stoppers that can impart a rubber odor, silicone is completely neutral. Medical-grade: our medical-grade silicone is biocompatible per ISO 10993 (cytotoxicity, sensitization, irritation testing) - making it suitable for medical device seals, vial stoppers, syringe caps, specimen container plugs, surgical instruments and pharmaceutical manufacturing. Medical-grade plugs undergo additional post-curing and batch testing to ensure consistent biocompatibility and sterility. Industrial-grade: our standard industrial-grade silicone plugs comply with RoHS and REACH and are suitable for general industrial, automotive, electronics and plumbing applications where food/medical contact is not required. Full customizability: we can produce plugs in virtually any size (1mm to 200mm diameter), any shape (tapered, stepped, cylindrical, flanged, T-shape, with through-hole, with pull tab/handle/ring), any hardness (20A to 80A Shore A), and any color (transparent, white, black, or custom Pantone). We also offer options for adhesive backing, fabric reinforcement, sponge/cellular silicone, flame retardant formulations (UL94 V-0), and conductive silicone (for EMI shielding or electrical grounding). Our in-house tooling department can design and manufacture custom molds within 7-15 days, and our engineering team can assist with material selection, hardness optimization and design for manufacturability - ensuring you get the right plug for your specific application, not a compromise.

Solutions for Buyer Concerns

We fully address global purchasers' primary concerns - pricing transparency, quality assurance, packaging durability and production craftsmanship - for every batch of silicone plug:

Factory-direct transparent pricing & cost-effective value: As an original silicone rubber manufacturer, we control the entire production chain from silicone raw material compounding and plug molding to post-curing, trimming, pull-tab integration, inspection and packaging. Tiered volume discounts are offered with no hidden fees, enabling importers, distributors and OEMs to maintain healthy margins while offering customers a high-performance sealing solution. Our silicone plugs are priced competitively against rubber, cork and plastic stoppers - while offering superior temperature resistance, autoclavability, reusability and non-porous hygiene that reduce total cost of ownership. Custom tooling fees are transparently priced based on mold complexity and size, and are refundable for large volume orders. We also offer material optimization consulting - our engineers can recommend the most cost-effective silicone formulation and hardness for your application, avoiding over-specification that increases cost unnecessarily.

Multi-stage rigorous quality inspection & material certification: Each production lot undergoes raw material batch testing (hardness, tensile strength, elongation, specific gravity), food-grade testing (FDA/LFGB extraction tests), medical-grade biocompatibility testing (ISO 10993, where applicable), high-temperature aging test (230℃ x 70h, verify no hardening/cracking), autoclave cycle test (121℃ x 30min x 50 cycles, verify no degradation), low-temperature flexibility test (-60℃, verify no brittleness), compression set test (70℃ x 22h, ASTM D395), ozone resistance test (50 pphm ozone x 72h, verify no cracking), dimensional inspection (100% for critical dimensions, AQL sampling for standard), hardness verification (Shore A durometer), pull-tab strength test (verify no tearing under specified pull force), seal leak test (air pressure & water immersion), visual inspection (no flash, voids, bubbles, discoloration), and certificate of conformity (COC) with batch traceability. Defective rates are tightly controlled for bulk orders, and full material test reports including food safety certifications are available for customs clearance and regulatory compliance.

Protective packaging & flexible logistics: Individual plugs are packed in PE or OPP bags to prevent dust, moisture and deformation during transit. Multi-piece sets (lab stopper assortments) use cardboard dividers or custom trays with size-coded compartments to prevent size mixing and damage. Large plugs are carefully packed with protective separation to prevent permanent deformation. Bulk cartons use reinforced corrugated boxes with proper cushioning. We partner with multiple logistics providers to offer sea, air and express options, balancing delivery speed and freight cost according to your schedule and budget. For urgent MRO (maintenance, repair and operations) or laboratory supply orders, we offer expedited production and express shipping options.

Precision molding craftsmanship & consistent material quality: The silicone plugs are produced via high-temperature compression molding or transfer molding in a controlled cycle - each plug is formed with uniform density, smooth surface, precisely controlled taper angle and dimensions, and an integrally molded pull tab that is strong and tear-resistant. The silicone material is compounded in-house with precise durometer control (±5 Shore A) and consistent batch-to-batch quality. Post-curing (secondary vulcanization) is performed to remove residual curing byproducts and optimize mechanical properties - an essential step for food-grade and medical-grade plugs. Flash removal is performed by precision trimming or cryogenic deflashing for clean, professional edges. The taper angle is precisely controlled (±0.5°) to ensure consistent fit across production lots. Compared with cheap, poorly compounded alternatives that use fillers, recycled material or inconsistent curing, our product maintains consistent hardness, dimensional accuracy, taper angle, pull-tab strength, temperature resistance and sealing performance across every batch - critical for applications where plug failure can lead to sample contamination, product loss, equipment damage or safety hazards.

Competitive Advantages & Peer Comparison

Most stoppers and plugs on the market fall into five material categories, each with significant drawbacks. Rubber stoppers (natural rubber, nitrile, SBR, butyl) are elastic and low-cost but have a limited temperature range (typically -30℃ to +120℃), are susceptible to ozone cracking and UV degradation (not suitable for outdoor long-term use), can have a strong rubber odor that contaminates samples, food or beverages, may contain curing agents or plasticizers that leach into contents (not food-safe without special formulation), can harden and lose elasticity with age, and are not reliably autoclavable (degrade after repeated sterilization cycles). Cork stoppers are traditional, lightweight and biodegradable but are porous and absorb liquids (wine, chemicals, water, media), can crumble and leave residue (cork dust in samples or wine), are single-use (expand permanently after insertion - the cork cells crush and do not recover), cannot withstand high temperatures or autoclaving, can harbor bacteria or mold (especially in damp laboratory or food environments), and can impart a "corky" flavor (cork taint from TCA contamination) to wine and beverages. Plastic stoppers (PE, PP, nylon, PTFE, silicone-free thermoplastics) are lightweight and chemical-resistant but have poor elasticity (do not conform well to irregular or out-of-round openings), can become brittle at low temperatures, may melt or deform at high temperatures (PE melts at ~130℃, PP at ~160℃), can crack under impact or overtightening, and many are not autoclavable. Glass stoppers (borosilicate, soda-lime) are chemically inert and heat-resistant but heavy, extremely fragile (easy to break - especially dangerous in laboratory settings with chemicals, or in food/beverage settings with glass shards in products), can become permanently stuck (glass-on-glass seizure from alkali deposition or thermal expansion mismatch), are not suitable for pressure or vacuum applications (can pop out or shatter), and do not provide a compliant seal (require grease or gaskets). Metal stoppers (aluminum, stainless steel, brass) are durable and heat-resistant but heavy, can corrode or gall (especially aluminum in wet environments), do not provide a compliant seal (require separate gaskets), can scratch or damage delicate openings (glass, plastic), are not suitable for glassware (hard metal against fragile glass), and can conduct heat (become too hot to handle when used with hot contents). None of these alternatives delivers a balanced combination of wide temperature range, high elasticity, autoclavability, non-porous hygiene, reusability, easy removal (pull tab), food/medical safety and customizability.

Our silicone plug achieves that balance and exceeds expectations on every dimension. The tapered conical design fits a range of opening sizes and provides a self-tightening seal - unlike cylindrical stoppers that require exact sizing and can pop out under pressure. The integrated pull tab allows effortless removal without tools or risk of breakage - unlike cork that requires a corkscrew, rubber that can get stuck, or glass that can seize. The wide temperature range (-60℃ to +230℃, with extreme grades available) and autoclavability cover applications from cryogenic storage to autoclave sterilization to hot filling - unlike rubber, cork, plastic and glass that each fail at different temperature extremes. The high elasticity and low compression set ensure long-term sealing reliability and full reusability - unlike cork that is single-use, or plastic that deforms permanently. The non-porous, non-stick surface prevents absorption, contamination and odor transfer - unlike cork that absorbs everything, or rubber that retains odors. The food-grade and medical-grade formulations meet FDA, LFGB and ISO 10993 standards - unlike rubber, cork and many plastics that are not food-safe or biocompatible. The excellent electrical insulation makes silicone ideal for electronic and electrical applications - unlike metal stoppers that conduct electricity. The full customizability (any size, shape, hardness, color, pull-tab style, through-hole option) ensures a perfect fit for every application - unlike standard off-the-shelf stoppers that require compromise. For laboratories, food processors, medical device manufacturers, automotive OEMs, electronics companies and industrial maintenance teams, this translates to a stopper with higher reliability, longer service life, lower total cost of ownership, broader application versatility, better hygiene/safety and full regulatory compliance - reducing contamination risks, maintenance costs and safety hazards across industries.

Usage, Installation & Maintenance Instructions

Proper installation and maintenance ensure optimal sealing performance and extend the service life of your silicone plugs:

Installation guidelines: Before installation, inspect the plug for any defects (cuts, tears, voids, bubbles, discoloration, dimensional inaccuracies, pull-tab damage) - do not install a damaged plug. Clean both the plug and the opening thoroughly - remove all dirt, grease, residue and debris using a suitable solvent and a non-abrasive cloth. Ensure the opening is dry and free of debris before inserting the plug. Select the appropriate size plug - for tapered conical plugs, choose a size where the opening diameter falls within the plug's taper range (the plug should seat at approximately 1/3 to 1/2 of its tapered length for optimal seal). Insert the plug into the opening with the narrow end first - push firmly but gently until the plug seats securely. The tapered design allows the plug to self-center and self-seal - no twisting or forcing required. For applications requiring a specific depth, use a stepped/shouldered plug with a defined flange that limits insertion. For through-hole applications (tubing/probe pass-through), ensure the tubing or probe is inserted through the center hole before seating the plug, and that the seal around the pass-through is secure. For pressure or vacuum applications, ensure the plug is fully seated and that the pull tab is not interfering with the seal. Do not over-insert the plug - pushing it too far can make removal difficult and may cause the plug to extrude or invert under pressure. For high-temperature applications (autoclaving, hot filling), ensure the plug is rated for the temperature and that it is not fully sealed (leave a slight gap or use a vented plug) to allow pressure equalization during heating - a fully sealed plug in a heating vessel can build up pressure and pop out or rupture.

Operating limits & compatibility: Ensure the plug material, hardness and temperature rating are suitable for your application's operating conditions - including temperature range, pressure/vacuum, fluid/media type, and static vs. dynamic use. Standard silicone plugs are suitable for water, steam, dilute acids and bases, alcohols, and some oils. For applications involving fuels, hydrocarbons, mineral oils or strong solvents, use fluorosilicone (FVMQ) plugs instead - standard silicone may swell in contact with these media. Do not exceed the rated temperature range - prolonged exposure above the rated temperature can cause hardening, cracking or degradation. Do not use silicone plugs in direct contact with open flame or molten metal. For autoclaving: our silicone plugs are autoclavable at 121℃ / 15 psi for 20-30 minutes - ensure the plug is not fully sealed (to allow pressure equalization) and that it is compatible with the autoclave cycle. For food and medical applications, ensure the plug is the appropriate food-grade or medical-grade formulation and that all post-curing and cleaning procedures are followed. For dynamic applications (frequent insertion/removal, moving parts), ensure the plug design and hardness are suitable - dynamic use requires consideration of friction, wear and pull-tab strength.

Cleaning & maintenance: During scheduled maintenance, inspect plugs for signs of wear, compression set, cracking, hardening, discoloration, pull-tab damage or leakage. Replace plugs that show significant compression set (flattened, no longer returning to original shape), cracking, hardening, pull-tab tearing, or visible leakage. Silicone plugs are reusable - if a plug is in good condition after removal (no damage, minimal compression set), it can be cleaned and reused. To clean: wipe with a clean cloth and a mild detergent or isopropyl alcohol - the non-porous, non-stick surface releases contaminants effortlessly. For thorough cleaning, wash with warm water and mild dish soap, using a soft brush to reach any crevices (under the pull tab, around the taper). The plugs are fully dishwasher-safe (top rack recommended). For food-grade and medical-grade plugs, follow the appropriate cleaning and sanitization procedures - silicone is compatible with most common sanitizers (bleach, alcohol, quaternary ammonium) and can be autoclaved at 121℃ for sterilization. For laboratory use, plugs can be sterilized by autoclaving, ethylene oxide (EtO) gas, or gamma irradiation - verify compatibility with your sterilization method. Do not use sharp tools to remove plugs - use the integrated pull tab, or use plastic/wooden tools to avoid scratching openings or damaging the plug. Store spare plugs in a cool, dry, dark place away from direct sunlight, ozone sources (electric motors, welding equipment) and extreme temperatures - hang or lay flat to avoid permanent deformation. Do not store plugs under heavy objects or in compressed condition for extended periods.

Replacement & disposal: Replace plugs at the first sign of failure or during scheduled maintenance intervals - do not wait for a catastrophic leak or contamination event. The service life of a silicone plug depends on the application (temperature, pressure, media, frequency of insertion/removal, sterilization cycles) - in benign static applications, silicone plugs can last 5-10+ years; in demanding applications (high temperature, frequent autoclaving, dynamic use), replacement may be needed every 1-3 years. Keep spare plugs in stock for critical equipment to minimize downtime. At end of life, silicone plugs can be disposed of in general waste (silicone is non-toxic and does not leach harmful chemicals) or recycled through specialized silicone recycling programs. Do not incinerate silicone plugs without proper emissions control - while silicone is non-toxic, combustion can produce silica dust.

We are a specialized silicone rubber products manufacturer with extensive experience in OEM & ODM production for global laboratory, food, medical, automotive, electronics and industrial markets. Our facility houses automated silicone compression molding and transfer molding lines, an in-house silicone compounding department, a post-curing oven facility, a precision trimming and cryogenic deflashing department, a pull-tab integration and through-hole drilling department, a material testing laboratory, and a dedicated quality control team - ensuring consistent output capacity and reliable batch quality for orders of any scale, from custom prototype plugs to high-volume OEM production runs.

• Production capacity: Multiple automated molding lines and a dedicated finishing team support stable daily output, enabling on-time delivery for both small-batch custom prototype orders and large-volume OEM/ODM shipments across all sizes, shapes, hardnesses and formulations. In-house tooling department designs and manufactures custom molds within 7-15 days.
• Certification system: Products comply with FDA 21 CFR 177.2600, LFGB, RoHS, REACH, UL94 V-0 (flame retardant), ISO 10993 (medical biocompatibility) standards. Our quality management system is certified to ISO 9001 and IATF 16949 (automotive), satisfying import requirements for Europe, North America, Southeast Asia, the Middle East and other major markets. Full material test reports and certificates of conformity (COC) with batch traceability are available for every production lot.
• R&D and customization: Our in-house engineering and R&D team supports custom plug design (based on your drawings, samples or application requirements), material formulation development (custom temperature grades, oil-resistant fluorosilicone, flame retardant, conductive silicone, foam/sponge silicone), hardness optimization, taper angle design, pull-tab/handle design, through-hole precision drilling, prototyping (3D-printed molds for quick prototypes), and full production tooling. We can turn your concept or drawing into a production-ready sample within 7-15 days, and offer design for manufacturability (DFM) consulting to optimize cost and performance.
• Packaging capability: We offer PE/OPP polybags, blister packs, cardboard boxes, bulk cartons, custom labeling with part numbers and batch codes, size-coded labeling for lab stopper assortments, individual packaging for MRO supply, and bespoke retail packaging - tailored to your distribution channel and brand requirements. Lab stopper sets are packed in size-coded compartment trays for easy identification and access.

• Factory-direct supply & cost-effective total ownership: No middleman markup, competitive wholesale pricing and stable production capacity for consistent laboratory supply, MRO supply and OEM production. Superior temperature resistance, autoclavability, reusability and non-porous hygiene reduce total cost of ownership compared to cork, rubber and plastic stoppers that require frequent replacement.
• Superior material performance & versatile design: 100% virgin silicone + tapered conical multi-size fit + integrated pull tab for easy removal + extreme temperature resistance & autoclavability + high elasticity & reusability + non-porous non-stick hygiene delivers sealing performance that cork, rubber, plastic, glass and metal stoppers cannot match across laboratory, food, medical, automotive, electronics and plumbing applications.
• Full customizability & engineering support: One-stop OEM/ODM service from custom size/shape/hardness/color/taper-angle development to pull-tab/handle design, through-hole drilling, material formulation, prototyping, tooling design and full production - with free engineering consulting for material selection, hardness optimization and design for manufacturability. In-house tooling within 7-15 days.
• Proven quality & regulatory compliance: Multi-stage inspection including raw material batch testing, autoclave cycle testing, high/low temperature testing, compression set testing, pull-tab strength testing, seal leak testing, dimensional inspection and hardness verification, plus FDA / LFGB / ISO 10993 / UL94 V-0 / RoHS / REACH / IATF 16949 / ISO 9001 certifications ensure reliable batch quality and smooth customs clearance for food, medical and automotive industries.
• Reliable supply & after-sales partnership: Stable production capacity, flexible logistics (sea/air/express), expedited options for urgent laboratory/MRO orders, dedicated account management for OEM customers, custom inventory programs (consignment/JIT), batch traceability documentation, and responsive technical support for installation, maintenance and failure analysis - for a smooth long-term partnership.

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