How to Select the Most Suitable Rubber Gasket Material Based on Working Conditions

As a critical component in industrial sealing systems, the material selection of rubber gaskets directly affects sealing performance and equipment operational safety. Based on years of industry experience, we provide systematic selection guidance for various rubber materials, including NBR, EPDM, and FKM, helping customers achieve optimal sealing solutions.

I. Common Rubber Material Characteristics

NBR (Nitrile Butadiene Rubber)

NBR offers excellent oil resistance, making it the preferred sealing material for petroleum-based oil media. With a temperature range of -30°C to +100°C, it demonstrates outstanding resistance to petroleum-based hydraulic oils, fuels, and lubricating oils. Our NBR products are suitable for hydraulic systems and fuel lines, though long-term outdoor use or contact with polar media should be avoided.

EPDM (Ethylene Propylene Diene Monomer)

EPDM exhibits exceptional weather and ozone resistance, making it particularly suitable for outdoor exposure environments. With a temperature range of -40°C to +120°C, it offers good resistance to polar media such as hot water, steam, brake fluid, and ketones. EPDM should not come into contact with mineral oils, fuels, or other petroleum-based media. Our EPDM products are widely used in HVAC systems, hot water pipelines, and outdoor sealing applications.

FKM (Fluoroelastomer)

FKM offers the most comprehensive performance, with a temperature range of -20°C to +250°C, excelling in oil resistance, weather resistance, and chemical corrosion resistance. It withstands most chemical media, including strong acids, strong alkalis, fuels, and solvents. Our FKM products are suitable for demanding conditions such as high temperature and strong corrosion, providing reliable sealing solutions for high-end applications in the chemical and petroleum industries.

II. Material Selection Based on Working Conditions

Selection by Media Type

Media compatibility is the primary consideration in material selection. For petroleum-based oil media, we recommend NBR; for polar media such as hot water, steam, and brake fluid, EPDM is recommended; for corrosive media, including strong acids, strong alkalis, fuels, and solvents, FKM is the optimal choice. We offer media compatibility testing services to ensure accurate selection.

Selection by Temperature Range

For low-temperature conditions, our silicone rubber products withstand temperatures as low as -60°C, while EPDM and NBR maintain good elasticity within the -40°C to -30°C range. For high-temperature conditions, FKM operates stably at 200°C to 250°C, silicone rubber has a maximum operating temperature of 200°C, and EPDM and NBR are suitable for applications below 120°C. The synergistic effect between temperature and media should be considered, and our technical team can provide a comprehensive evaluation.

III. Selection Decision Process

We recommend customers follow this scientific selection process:

Step 1: Define Working Parameters. Record key information, including media type, operating temperature range, maximum operating pressure, and whether outdoor use is required.

Step 2: Identify Candidate Materials. Based on media and temperature, preliminarily select applicable materials. Our technical support team can provide professional recommendations.

Step 3: Comprehensive Evaluation. Consider factors such as cost, service life, and installation convenience to determine the final material solution.

Step 4: Verification Testing. For critical applications, we offer sample testing services to confirm sealing effectiveness through laboratory verification.

IV. Selection Considerations

Media Compatibility: Avoid material incompatibility with media. EPDM swells and fails rapidly upon contact with mineral oils, while NBR may experience performance degradation when in contact with polar media such as brake fluid.

Hardness Selection: Rubber gaskets with a hardness of 70±5 Shore A are suitable for most sealing applications. Higher hardness products can be selected for high-pressure conditions, while lower hardness products are suitable for low-pressure or gas sealing applications.

Compression Set: For long-term compression applications, materials with low compression set, such as FKM or high-quality EPDM, should be selected. Our products undergo rigorous testing to ensure long-term stability.

V. Products and Services

We offer a complete range of rubber sealing products covering NBR, EPDM, silicone rubber, FKM, CR, and other materials, with complete specifications and support for customized production. For more product information, technical specifications, or selection recommendations, please contact our customer service.