Shunwei Silicone & Rubber
Shunwei Silicone & Rubber is a trusted manufacturer of custom-molded, extruded, and fabricated rubber and silicone parts. We specialize in high-quality custom production, meeting the most demanding specifications for industrial and commercial applications. Whether you need a unique component for a new design or a large-scale production run for replacements or distribution, Shunwei has the expertise and capacity to deliver.
Our production facilities are equipped with advanced machinery and managed using modern systems, ensuring both flexibility and efficiency. From prototype to full-scale manufacturing, we provide reliable, cost-effective solutions—delivered right the first time, on time, and on budget.
Custom Rubber Molding & Extrusion Capabilities
What capabilities are included in custom rubber molding & extrusion services?
Shunwei Silicone & Rubber offers comprehensive rubber and silicone manufacturing capabilities tailored to your custom needs.
Molding:
We provide compression, transfer, and injection molding services to ensure each part is produced using the most efficient method for your application. We also offer latex dip molding for products like boots and bellows. Our molded parts are available in a wide range of materials, durometer hardness levels, and colors. Beyond commercial-grade materials, we work with compounds that meet or exceed Mil-Spec, ASTM, SAE, ANSI, and FDA standards—and can develop custom formulations when required.
Extruding:
Shunwei manufactures custom rubber and silicone tubing, profiles, washers, and gaskets in both simple and complex shapes. Our extrusion capabilities support production in continuous coils or cut lengths, with precision features such as holes, notches, and molded corners. Gaskets can be fabricated with molded or injection-molded joints for added strength and sealing performance.
In-House Tooling:
With our in-house tooling capabilities, we can quickly and cost-effectively produce accurate molds and dies, ensuring consistent quality from prototype to full production.
We support a wide range of materials, colors, and hardness levels, giving you full flexibility in design and performance. Shunwei delivers dependable quality, efficient turnaround, and complete custom solutions for your rubber and silicone part needs.
Contact us today to see how we can support your next project.Product Categories
- Rubber Gasket
- O-Ring
- P-Rubber Stopper
- Q-Rubber Grommets
- R-Vibration Isolation Mounts
- S-Rubber Bellows & Boots
Materials
- Natural Rubber
- Buna-N
- Silicone
- HNBR
- Neoprene
- EPR / EPDM
- Fluoroelastomers
- SBR
- Fluorosilicone
- Butyl
- Urethane
Natural Rubber
What is Natural Rubber Molding?
At Shunwei Silicone & Rubber, we specialize in manufacturing precision-molded parts using natural rubber (polyisoprene), known for its excellent mechanical and dynamic properties. Natural rubber offers high resilience, outstanding tear strength, good low-temperature flexibility, and superior vibration isolation performance. While it does not provide a smooth ground surface, it delivers excellent friction characteristics and compression set resistance.
We produce a wide range of natural rubber components, including:
- Insulation Grommets
- Vibration Mount Grommets
- Grommet-Style and Recess-Style Bumpers
- Angle Extrusions
- Solid Rubber Strips and Cords
- Vibration Isolation Mounts (Round & Conical)
- Rubber Bellows and Boots (Tapered, Double Cuff End, and Custom Designs)
Note: Natural rubber is not recommended for applications involving oils, solvents, or ozone exposure.
Interested in custom natural rubber molding? Contact Shunwei Silicone & Rubber to discuss your project.
Characteristics of Natural Rubber
Common Name: Natural Rubber
Chemical Name: Polyisoprene
ASTM D2000 Classification: AA
MIL-STD-417 Designation: RN
General Material Properties
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 20 – 100 |
| Tensile Strength (psi) | 500 – 3500 |
| Elongation (%) | Up to 700 |
| Compression Set | Excellent |
| Resilience (Rebound) | Excellent |
| Abrasion Resistance | Excellent |
| Tear Resistance | Excellent |
| Solvent Resistance | Poor |
| Oil Resistance | Poor |
| Temperature Range | -29°C to 80°C(-20°F to 175°F) |
| Low Temp Flexibility | Very Good |
| Weather/Ozone Resistance | Poor |
| Adhesion to Metals | Excellent |
Buna-N
What is Buna-N (Nitrile Rubber)?
Buna-N, also known as Nitrile Rubber or NBR, is a versatile oil-resistant synthetic rubber widely used in industrial applications. It offers excellent resistance to oils, fuels, water, and many hydraulic fluids, along with good abrasion resistance, tensile strength, and compression set performance.
However, Buna-N is not suitable for use in highly polar solvents such as acetone, MEK (methyl ethyl ketone), ozone, chlorinated hydrocarbons, or nitro hydrocarbons.
Nitrile Rubber Products by Shunwei
At Shunwei Silicone & Rubber, we manufacture a wide range of custom Buna-N components to meet your sealing, vibration isolation, and protection needs. Our nitrile rubber products include:
- Insulation Grommets
- Vibration Mount Grommets
- Recess Style Bumpers
- Solid Strips and Cords
- Mounting Hole Grommets
- Appliance Feet, Tips, and Bumpers
- Pad-Style Bumpers
- Extruded Profiles & Tubing (including U-Channels, D-Strips, P-Strips, and Sealing Strips)
- Special Extruded Tubing and Custom Seals
- Refrigerator Door Seals
- Angle Extrusions
- Vibration Isolation Mounts
- Mil-Spec Grommets
Characteristics of Buna-N Rubber
Common Names: Buna-N, Nitrile, NBR
ASTM D2000 Classification: BF, BG, BK
Military Standard (MIL-STD 417): SB
Chemical Name: Butadiene Acrylonitrile
General Properties of Buna-N Components
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 20 – 95 |
| Tensile Strength (psi) | 200 – 3000 |
| Elongation (%) | Up to 600 |
| Compression Set | Good |
| Resilience (Rebound) | Good |
| Abrasion Resistance | Excellent |
| Tear Resistance | Good |
| Solvent Resistance | Good to Excellent |
| Oil Resistance | Good to Excellent |
| Temperature Range | -40°C to 121°C (-40°F to 250°F) |
| Weather/Ozone Resistance | Poor |
| Adhesion to Metals | Good to Excellent |
Silicone
What is Industrial Silicone Product Manufacturing?
At Shunwei Silicone & Rubber, we specialize in the custom manufacturing of industrial silicone products designed for demanding applications. Silicone rubber is an exceptionally versatile material that can be formulated to meet a wide range of performance needs, including high tensile strength (up to 1500 PSI), tear resistance (up to 200 lbs.), excellent resilience, low compression set, and outstanding resistance to heat, ozone, and oxidation. It also performs well in extremely low temperatures and offers excellent release characteristics.
While silicone provides moderate resistance to solvents and oils, it is generally not suitable for use with concentrated solvents, strong acids, or bases like dilute sodium hydroxide.
Silicone Products We Manufacture
We offer a broad range of silicone-based products, including:
- Insulation Grommets
- Stoppers
- End Caps
- Vibration Mount Grommets
- Mounting Hole Grommets
- Recess-Style Bumpers
- Appliance Feet, Tips & Bumpers
- Solid Rubber Strips & Cords
- Extruded Tubing & Profiles
- U-Channels, H-Strips, D-Strips, P-Strips
- Refrigerator Door Seals
- Sealing Strips
- Vibration Isolation Mounts
- Mil-Spec Grommets
These products are available in various hardness levels, colors, and shapes to suit your custom application.
Material Characteristics of Silicone Rubber
Common Name: Silicone
Chemical Definition: Polysiloxane
ASTM D2000 Classifications: FC, FE, GE
MIL-STD 417 Designation: TA
General Performance Properties
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 30 – 90 |
| Tensile Strength (psi) | 200 – 1500 |
| Elongation (%) | Up to 700 |
| Compression Set | Good |
| Resilience (Rebound) | Good |
| Abrasion Resistance | Fair to Poor |
| Tear Resistance | Poor |
| Solvent Resistance | Poor |
| Oil Resistance | Fair to Poor |
| Temperature Range | -100°C to 232°C (-150°F to 450°F) |
| UV/Ozone Resistance | Excellent |
| Adhesion to Metals | Good |
HNBR
What is Hydrogenated Nitrile Butadiene Rubber (HNBR)?
Hydrogenated Nitrile Butadiene Rubber, commonly known as HNBR, is essential for equipment that must operate reliably in demanding environments. From fluid transport to resistance against heat and oxidation, HNBR offers exceptional performance where durability matters most. It is widely used in custom-molded and extruded rubber components designed to meet rigorous industrial and commercial requirements.
Benefits of HNBR Molded and Extruded Parts
HNBR—also referred to as Highly Saturated Nitrile (HSN)—is a hydrogenated version of standard nitrile rubber, offering improved stability and physical performance. Through hydrogenation, the polymer chain becomes more saturated, greatly enhancing resistance to heat, chemicals, and oxidative degradation.
Key benefits include:
- High mechanical strength
- Excellent resistance to heat and oxidation
- Compatibility with modern oils, fuels, and coolants
- Superior wear resistance
- Broad temperature range: -60°C to 160°C
Common Applications for HNBR Components
Thanks to its ability to endure long-term exposure to heat, oil, and aggressive chemicals, HNBR is ideal for critical components in a variety of industries:
- Fluid power systems
- Oil and gas equipment
- Medical devices
- Aerospace applications
- Industrial machinery
- Semiconductor processing
- Consumer electronics
Typical HNBR components include:
- Air-conditioning seals and hoses
- Engine gaskets, seals, and grommets
- Fuel system hoses and seals
- Serpentine belts
- Suspension and piston seals
- Blowout preventers
- Vee packing
- Heat exchanger gaskets
- Oilfield packers and hangers
- Rotary shaft and steel mill seals
- Papermill rolls
Types of Molded and Extruded HNBR Products
HNBR can be molded and extruded into a wide variety of components. Some common products include:
- Seals and gaskets
- Grommets and grommet inserters
- Bumpers, tips, and appliance feet
- Extruded profiles and tubing
- Rubber bellows and boots
- Vibration isolation mounts
Using advanced manufacturing equipment and experienced personnel, high-performance HNBR components can be produced cost-effectively while meeting or exceeding industry standards and customer expectations.
Neoprene
What is Neoprene?
Neoprene, also known as polychloroprene, is a versatile, all-purpose synthetic rubber widely used in industrial and commercial applications. Known for its balance of mechanical and chemical properties, neoprene offers high resilience, a low compression set, and natural flame resistance. It is generally unaffected by moderate chemicals, fats, greases, animal and vegetable oils, and many solvents.
Neoprene compounds can also be formulated sulfur-free, making them ideal for sensitive applications. However, neoprene is not suitable for use with strong oxidizing acids, esters, ketones, chlorinated aromatic hydrocarbons, or nitro compounds.
Neoprene Rubber Products
We manufacture a wide range of custom-molded and extruded parts using neoprene rubber. Our neoprene product offerings include:
- Grommets
- Vibration Mount Grommets
- Mounting Hole Grommets
- Insulation Grommets
- Bumpers, Tips & Appliance Feet
- Recess-Style Bumpers
- Grommet-Style Bumpers
- Pad-Style Bumpers
- Extrusions & Tubing
- U-Channels
- Refrigerator Door Seals
- D-Strips, P-Strips, H-Strips
- Sealing Strips
- Solid Strips and Cords
- Special Extruded Profiles
- Angle Extrusions
- Vibration Isolation Mounts
- Round Vibration Mounts
- Conical Vibration Mounts
- Bellows & Boots
- Double Cuff End Bellows
- Tapered Bellows
- Molded Rubber Boots
- Custom-Designed Boots
Neoprene Material Characteristics
Common Name: Neoprene
Chemical Definition: Polychloroprene
ASTM D2000 Classification: BC, BE
Military Designation (MIL-STD 417): SC
General Performance Properties
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 20 – 95 |
| Tensile Strength (psi) | 500 – 3000 |
| Elongation (%) | Up to 600 |
| Compression Set | Good |
| Resilience (Rebound) | Excellent |
| Abrasion Resistance | Excellent |
| Tear Resistance | Good |
| Solvent Resistance | Fair |
| Oil Resistance | Fair |
| Temperature Range | -45°C to 121°C (-50°F to 250°F) |
| Weathering/UV Resistance | Good |
| Adhesion to Metals | Good to Excellent |
EPR / EPDM
What is Ethylene Propylene Rubber (EPDM/EPR)?
Ethylene Propylene Rubber (EPDM or EPR) is a high-performance synthetic rubber known for its exceptional resistance to environmental exposure and aging. It offers outstanding resistance to ozone, UV, weathering, steam, and a wide range of chemicals and water-based solutions. EPDM also performs well in high temperatures—up to 350°F (177°C)—and provides low gas permeability and excellent durability in outdoor applications.
While EPDM is not suitable for oil, solvent, or aromatic hydrocarbon exposure, it shows moderate compatibility with ketones and alcohols. It is not recommended for food-grade applications.
EPDM Rubber Products
We manufacture a wide selection of EPDM molded and extruded components, including:
- Vibration Mount Grommets
- Mounting Hole Grommets
- Grommet-Style Bumpers
- Recess-Style and Pad-Style Bumpers
- Tips and Appliance Feet
- Solid Rubber Strips and Cords
- Extruded Rubber Tubing and Profiles
- U-Channels, D-Strips, P-Strips, H-Strips, and Sealing Strips
- Refrigerator Door Seals
- Angle Extrusions
- Vibration Isolation Mounts
These components are ideal for outdoor, automotive, HVAC, and industrial sealing applications.
EPDM Material Characteristics
Common Names: EPDM, EPR, EPT
Chemical Definition: Ethylene Propylene
ASTM D2000 Classification: CA
Military Standard (MIL-STD 417): RS
General Physical Properties
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 30 – 90 |
| Tensile Strength (psi) | 500 – 2500 |
| Elongation (%) | Up to 600 |
| Compression Set | Good |
| Resilience (Rebound) | Good |
| Abrasion Resistance | Good |
| Tear Resistance | Fair |
| Solvent Resistance | Poor |
| Oil Resistance | Poor |
| Temperature Range | -60°F to 350°F (-51°C to 177°C) |
| Weathering/Ozone Resistance | Excellent |
| Adhesion to Metals | Fair to Good |
Fluoroelastomers
What is Fluoroelastomer (Viton/FKM)?
Fluoroelastomer, commonly known by the trade name Viton®, is a high-performance synthetic rubber specifically designed to withstand extreme chemical and thermal environments. It offers outstanding resistance to oils, fuels, solvents, and a wide range of chemicals—including aliphatic, aromatic, and halogenated hydrocarbons, acids, and animal/vegetable oils.
With exceptional heat resistance up to 600°F (315°C) and long-term durability in aggressive environments, fluoroelastomers are widely used in critical sealing and vibration isolation applications across automotive, aerospace, industrial, and chemical processing industries.
Fluoroelastomer (Viton) Products
We manufacture a wide range of custom molded and extruded components using fluoroelastomer materials, including:
- Vibration Mount Grommets
- Mounting Hole Grommets
- Insulation Grommets
- Recess-Style Bumpers
- Refrigerator Door Seals
- Angle Extrusions
- Custom Viton Gaskets and Seals
These components are engineered to perform in the most demanding environments where standard rubbers would fail.
Viton / Fluoroelastomer Material Characteristics
Common Names: Viton®, FKM, Fluoroelastomer
Chemical Definition: Fluorinated Hydrocarbon
ASTM D2000 Classification: HK
Military Standards: MIL-R-25897, MIL-R-83248
General Performance Properties
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 60 – 90 |
| Tensile Strength (psi) | 500 – 2000 |
| Elongation (%) | Up to 300 |
| Compression Set | Good |
| Resilience (Rebound) | Fair |
| Abrasion Resistance | Good |
| Tear Resistance | Good |
| Solvent Resistance | Excellent |
| Oil Resistance | Excellent |
| Low Temperature Usage | -10°F to +10°F (-23°C to -12°C) |
| High Temperature Usage | Up to 600°F (315°C) |
| Weathering/UV Resistance | Excellent |
| Adhesion to Metals | Good |
SBR
What is SBR (Styrene-Butadiene Rubber)?
Styrene-Butadiene Rubber (SBR) is a widely used, cost-effective synthetic rubber with excellent abrasion resistance and good water resistance. Often referred to as Buna-S or GRS, SBR is suitable for applications requiring durability and flexibility, particularly where exposure to oils, ozone, or strong chemicals is not a concern.
SBR performs well in low to moderate chemical environments and maintains good resilience and compression set up to around 70 durometer. At higher hardness levels, compression set tends to worsen. While SBR is not recommended for use with strong acids, fats, greases, hydrocarbons, or ozone exposure, it remains a popular choice for general-purpose molded and extruded rubber components.
SBR Rubber Products We Offer
We produce a wide range of custom-molded and extruded parts using SBR, including:
- Grommets: Insulation Grommets, Vibration Mount Grommets, Mounting Hole Grommets
- Bumpers & Feet: Grommet Style, Recess Style, Tack Style, Pad Style, Appliance Feet
- Strips & Cords: Solid Strips, Cords, Sealing Strips, D-Strips, H-Strips, P-Strips
- Profiles & Tubing: U-Channels, Custom Extruded Tubing & Seals, Refrigerator Door Seals
- Other Components: Extruded Rubber Profiles, Vibration Isolation Components
SBR can be easily molded or extruded into various shapes, making it a reliable solution for applications in sealing, cushioning, and vibration damping.
SBR Material Characteristics
Common Names: SBR, Buna-S, GRS
Chemical Definition: Styrene-Butadiene
ASTM D2000 Classification: AA, BA
Military Spec (MIL-STD 417): RS
General Properties of SBR Rubber
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 30 – 100 |
| Tensile Strength (psi) | 500 – 3000 |
| Elongation (%) | Up to 600 |
| Compression Set | Good |
| Resilience (Rebound) | Good |
| Abrasion Resistance | Excellent |
| Tear Resistance | Fair |
| Solvent Resistance | Poor |
| Oil Resistance | Poor |
| Temperature Range | -50°F to 225°F (-45°C to 107°C) |
| UV/Ozone Resistance | Poor |
| Adhesion to Metals | Excellent |
Fluorosilicone
What is Fluorosilicone?
Fluorosilicone rubber is a specialized elastomer developed for applications requiring enhanced chemical resistance where standard silicone would degrade. While significantly more expensive than conventional silicone, fluorosilicone offers superior resistance to oxidizing chemicals, aromatic hydrocarbons, and chlorinated solvents, making it an excellent choice for aerospace, automotive, and industrial sealing solutions in chemically aggressive environments.
Common applications include insulation grommets and recess-style bumpers, particularly in systems exposed to fuels or solvents where silicone would not suffice.
Limitations of Fluorosilicone
Despite its strengths, fluorosilicone is not suitable for all applications. It is generally attacked by brake fluids, hydrazine, and ketones, and its high-temperature resistance is lower than that of standard silicone. It is also not recommended for high-dynamic mechanical uses due to limited tear and abrasion resistance.
Fluorosilicone Material Characteristics
Common Name: Fluorosilicone
ASTM D2000 Classification: FK
Military Standard: MIL-R-25988, Amendment 2
Chemical Definition: Fluorosilicone Rubber
General Performance Properties
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 50 – 80 |
| Tensile Strength (psi) | 500 – 800 |
| Elongation (%) | Up to 300 |
| Compression Set | Good |
| Resilience (Rebound) | Excellent |
| Abrasion Resistance | Poor |
| Tear Resistance | Poor |
| Solvent Resistance | Fair |
| Oil Resistance | Good |
| Low Temperature Usage | Down to -80°F (-62°C) |
| High Temperature Usage | Up to 300°F (149°C) |
| UV/Ozone Resistance | Excellent |
| Adhesion to Metals | Poor |
Butyl
What is Butyl Rubber?
Butyl rubber, also known as isobutylene isoprene rubber, is valued for its exceptional gas impermeability and resistance to sunlight, ozone, and weathering. It is commonly used in sealing applications where air and moisture retention is critical. Butyl performs well in contact with animal and vegetable oils, as well as some oxidizing chemicals.
However, it is not recommended for use with petroleum solvents, coal tar derivatives, or aromatic hydrocarbons, as these can degrade its structure. Due to its low permeability and environmental durability, butyl is often used in U-channels, liners, and sealing profiles.
Butyl Rubber Material Characteristics
Common Name: Butyl
Chemical Definition: Isobutylene Isoprene
ASTM D2000 Classification: AA, BA
Military Standard (MIL-STD 417): RS
General Performance Properties
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 40 – 90 |
| Tensile Strength (psi) | 500 – 3000 |
| Elongation (%) | Up to 850 |
| Compression Set | Fair to Good |
| Resilience (Rebound) | Fair |
| Abrasion Resistance | Fair |
| Tear Resistance | Good |
| Solvent Resistance | Poor |
| Oil Resistance | Poor |
| Temperature Range | -51°C to 121°C (-60°F to 250°F) |
| Weathering/UV Resistance | Excellent |
| Adhesion to Metals | Good |
Urethane
What is Urethane (Polyurethane)?
Polyurethane (Urethane) is a highly versatile material available in both castable and millable forms, each offering unique performance advantages for industrial applications.
Castable polyurethane is known for its exceptional abrasion resistance, low surface friction, and high tensile strength—up to 6000 PSI. It offers good oil, solvent, and ozone resistance, along with a low compression set at higher hardness levels. However, it has poor resistance to heat and hot water, making it less suitable for high-temperature or steam applications.
Millable polyurethane is widely used and can be chemically enhanced with reinforcing agents to meet specific performance needs. It provides superior wear resistance, low rebound, and excellent oil resistance (comparable to high-grade nitrile). While it resists moderate hydrocarbons and chemicals well, it is not recommended for use in hot water or above 175°F, and is generally vulnerable to concentrated acids, ketones, esters, and chlorinated or nitro hydrocarbons.
RF Welding & Urethane Films
We also offer RF welding services using thin urethane films to create lightweight, flexible, and durable bellows. Options include tapered bellows and double cuff end bellows, ideal for applications where strength, flexibility, and low weight are essential.
Urethane Material Characteristics
Common Names: Urethane, Polyurethane
Chemical Definition: Polyester/Polyether Urethane
ASTM D2000 Classification: BG
Military Standard (MIL-STD 417): SB
General Performance Properties
| Property | Value/Range |
|---|---|
| Durometer (Shore A) | 35 – 100 |
| Tensile Strength (psi) | 500 – 6000 |
| Elongation (%) | Up to 750 |
| Compression Set | Poor |
| Resilience (Rebound) | Good |
| Abrasion Resistance | Excellent |
| Tear Resistance | Excellent |
| Solvent Resistance | Poor |
| Oil Resistance | Good |
| Temperature Range | -34°C to 79°C (-30°F to 175°F) |
| Weathering/UV Resistance | Excellent |
| Adhesion to Metals | Fair to Good |