NBR nitrile rubber seals are widely used in various applications due to their compatibility with petroleum-based hydraulic fluids, glycol-based hydraulic oils, diester lubricants, gasoline, water, silicone grease, and silicone oil. They are known for being the most cost-effective and versatile option among rubber seals. However, they are not suitable for use with polar solvents such as ketones, ozone, nitrohydrocarbons, MEK, or chloroform. The typical temperature range is from -40°C to 120°C, making them ideal for general industrial and automotive uses.
HNBR (Hydrogenated Nitrile Butadiene Rubber) seals offer improved resistance to corrosion, tearing, and compression set compared to standard NBR. They also perform well against ozone, UV light, and weathering, with better wear resistance than regular nitrile rubber. These seals are commonly used in washing machines, automotive engine systems, and refrigeration units that use environmentally friendly refrigerants like R134a. However, they are not recommended for use with alcohols, esters, or aromatic solvents. Their operating temperature range is typically between -40°C and 150°C.
Silicone rubber seals are highly valued for their exceptional heat and cold resistance, as well as their ability to resist ozone and atmospheric aging. They also provide good electrical insulation properties. However, they have lower tensile strength compared to conventional rubbers and are not oil-resistant. These seals are often found in household appliances like electric water heaters, irons, and microwave ovens, as well as in products that come into contact with the human body, such as water bottles and dispensers. They should not be exposed to concentrated solvents, oils, acids, or sodium hydroxide. Their temperature range is generally from -55°C to 250°C.
VITON fluorocarbon rubber seals excel in high-temperature environments and offer superior resistance to weather, ozone, and chemicals. While they are not ideal for low temperatures, they are resistant to most oils, solvents, acids, and both aliphatic and aromatic hydrocarbons. They are commonly used in diesel engines, fuel systems, and chemical plants. However, they are not recommended for use with ketones, low molecular weight esters, or nitrated mixtures. Their typical temperature range is -20°C to 250°C.
FLS fluorosilicone rubber seals combine the benefits of both fluorocarbon and silicone rubbers, offering excellent oil, solvent, and fuel resistance along with high and low-temperature performance. They are resistant to oxygen-containing compounds, aromatic solvents, and chlorine-based solvents. These seals are frequently used in aerospace, aviation, and military applications. However, they are not recommended for exposure to ketones or brake fluids. Their operating temperature range is usually from -50°C to 200°C.
EPDM (Ethylene Propylene Diene Monomer) rubber seals are known for their excellent resistance to weather, ozone, water, and chemicals. They can withstand exposure to alcohols and ketones and are suitable for sealing in high-temperature steam environments. They are commonly used in sanitary equipment, automotive radiators, and brake systems. However, they are not recommended for food-grade applications or exposure to mineral oils. Their typical temperature range is -55°C to 150°C.
CR (Chloroprene) rubber seals are highly resistant to sunlight, weather, and refrigerants such as dichlorodifluoromethane and ammonia. They resist dilute acids and silicone greases but tend to expand significantly when exposed to mineral oils with a low aniline point. They can become hard and brittle at low temperatures. These seals are suitable for outdoor and chemical-resistant applications. However, they are not recommended for use with strong acids, nitrohydrocarbons, esters, chloroforms, or ketones. Their operating temperature range is generally from -55°C to 120°C.
IIR (Butyl) rubber seals are known for their excellent air tightness, heat resistance, UV resistance, and ozone resistance. They also provide good insulation and are resistant to polar solvents like alcohols, ketones, and esters. They can withstand vegetable oils and oxidizable substances. These seals are ideal for chemical-resistant or vacuum applications. However, they are not recommended for use with petroleum solvents, kerosene, or aromatic hydrocarbons. Their temperature range is typically -50°C to 110°C.
ACM (Acrylate) rubber seals offer good resistance to oil, high temperatures, and weather conditions, although their mechanical strength, compression set, and water resistance are slightly lower. They are commonly used in automotive transmission and power steering systems. However, they are not suitable for hot water, brake fluid, or phosphate esters. Their operating temperature range is usually between -25°C and 170°C.
NR (Natural) rubber seals have excellent wear resistance, elasticity, tear strength, and elongation. However, they are prone to aging in air, become sticky when heated, and swell or dissolve in mineral oils or gasoline. They are alkali-resistant but not suitable for strong acids. These seals are appropriate for use with brake fluid and ethanol containing hydroxide ions. Their temperature range is generally from -20°C to 100°C.
PU (Polyurethane) rubber seals are renowned for their outstanding mechanical properties, including high wear resistance and pressure resistance. They also exhibit good aging, ozone, and oil resistance, although they tend to hydrolyze at high temperatures. They are commonly used in high-pressure and wear-resistant sealing applications, such as hydraulic cylinders. Their typical temperature range is -45°C to 90°C.
FFKM (Perfluoroelastomer) seals offer excellent chemical resistance, withstanding most acids, bases, ketones, esters, ethers, and strong oxidants. They can withstand temperatures up to 320°C and are often used in critical sealing applications where extreme chemical resistance is required. However, they are very expensive, costing nearly 100 times more than standard rubber materials.
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