Rubber Seals Material Guide: SIL, NBR, EPDM, Viton & More (Properties & Applications)

Complete Guide to Rubber Seal Materials: Properties, Applications & Advantages

Rubber seals are vital components in industrial applications, serving as critical sealing devices to prevent liquid or gas leakage. Selecting the right seal material ensures the safety, efficiency, and longevity of machinery and equipment. This guide provides a comprehensive overview of the most commonly used rubber sealing materials, including their properties, temperature ranges, chemical resistance, and industrial applications.

SIL Silicone Rubber Seals

SIL silicone rubber seals are known for their excellent heat and cold resistance, ozone resistance, atmospheric aging resistance, and sound insulation. Their tensile strength exceeds that of general rubber, but they are not resistant to oils.

Applications:

• Household appliances: water heaters, irons, microwave ovens

• Food-contact items: kettles, drinking fountains

Temperature Range: -55°C to 250°C

Key Advantage: High-temperature stability and insulation

Limitation: Poor oil resistance

IIR Butyl Rubber Seals

IIR butyl rubber seals offer excellent airtightness, heat, sunlight, and ozone resistance, as well as sound insulation. They are also resistant to polar solvents such as alcohols, ketones, and esters, and can handle animal and vegetable oils.

Applications:

• Chemical-resistant or vacuum equipment

Temperature Range: -50°C to 110°C

Limitation: Not suitable for petroleum solvents, kerosene, or aromatics

NBR Butyl Cyanide Rubber Seals

NBR is the most widely used and cost-effective rubber seal. It is compatible with petroleum-based hydraulic oils, glycol-based hydraulic oils, gasoline, water, silicone oils, and more.

Applications:

• Hydraulic systems

• Automotive engines

Temperature Range: -40°C to 120°C

Limitation: Not compatible with ketones, ozone, nitro hydrocarbons, MEK, or chloroform

FLS Fluorosilicone Rubber Seals

FLS combines the advantages of fluorine and silicone rubber, offering resistance to oil, solvents, fuel oil, and extreme temperatures. They resist erosion by oxygen compounds, aromatic hydrocarbons, and chlorinated solvents.

Applications:

• Aerospace

• Aviation

• Military equipment

Temperature Range: -50°C to 200°C

Limitation: Not recommended for ketones and brake fluids

EPDM Rubber Seals

EPDM seals are ideal for environments with weathering, ozone, water, and chemical exposure. They are suitable for sealing high-temperature water vapor and alcohols or ketones.

Applications:

• Bathroom fittings

• Automotive radiators

• Brake systems

Temperature Range: -55°C to 150°C

Limitation: Not suitable for mineral oils or food-contact applications

CR Neoprene Seals

CR neoprene seals provide excellent sunlight and weather resistance, compatibility with certain refrigerants, and resistance to dilute acids.

Applications:

• Outdoor exposure

• Flame-resistant and chemical-resistant sealing links

Temperature Range: -55°C to 120°C

Limitation: Sensitive to solid acids, nitro hydrocarbons, esters, chloroform, and ketones

ACM Acrylic Rubber Seals

ACM seals excel in oil and heat resistance, commonly used in automotive transmission and power steering systems.

Temperature Range: -25°C to 170°C

Limitation: Mechanical strength, compression set, and water resistance are moderate

NR Natural Rubber Seals

NR seals offer high elasticity, tensile strength, and abrasion resistance, but they are prone to aging and oil swelling.

Applications:

• Brake fluids

• Ethanol and hydroxide-containing liquids

Temperature Range: -20°C to 100°C

Limitation: Poor resistance to strong acids and petroleum-based oils

PU Polyurethane Seals

PU seals have excellent mechanical properties, wear resistance, and high-pressure performance, ideal for heavy-duty industrial applications.

Applications:

• Hydraulic cylinders

• High-pressure sealing links

Temperature Range: -45°C to 90°C

Limitation: Poor high-temperature hydrolysis resistance

HNBR Hydrogenated Butyl Rubber Seals

HNBR improves upon NBR with better corrosion, tearing, and compression deformation resistance, as well as ozone and weathering resistance.

Applications:

• Washing machines

• Automotive engine systems

• Refrigeration systems using R134a

Temperature Range: -40°C to 150°C

Limitation: Not recommended for alcohols, esters, or aromatic solutions

Viton Fluorocarbon Rubber Seals

Viton seals provide exceptional high-temperature, chemical, and weather resistance, outperforming silicone in many industrial conditions. They resist oils, acids, aliphatic and aromatic hydrocarbons, and animal/vegetable oils.

Applications:

• Diesel engines

• Fuel systems

• Chemical plant sealing

Temperature Range: -20°C to 250°C

Limitation: Poor cold flexibility and not suitable for ketones or low molecular weight esters

Conclusion

Selecting the right rubber seal material is crucial to ensure system reliability, efficiency, and safety. From SIL silicone for food contact to Viton for high-temperature chemical resistance, each material offers unique advantages for industrial applications. Proper selection reduces maintenance, prevents leakage, and prolongs equipment life.

Contact Us

For high-quality fastener screws, washers, and rubber seals or technical support in structural design, contact us:

Email: adelajonly@gmail.com
Website: www.juxinfasteners.com

We provide OEM manufacturing, global supply, and engineering support for industrial sealing solutions.