Technologies

Materials and features | General-purpose seal technology | Technologies | NOK Corporation

Materials and features | General-purpose seal technology | Technologies | NOK Corporation
Types of seals Materials of seals Characteristics Major applications
Rotary seals, oil seals, gland Gaskets, mechanical seals Nitrile rubber (NBR) Materials of general-purpose seals Oil seals
Acrylic rubber (ACM) Materials of heat-resistant and abrasion-resistant seals
Silicone rubber (VMQ) Materials of heat-resistant and abrasion-resistant seals. Low oil resistance.
Fluororubber (FKM) Materials of heat-resistant and oil-resistant seals
Fibers for braided Gaskets Materials of seals with wide applications. Low sealing property. Gland Gaskets
Expanded graphite Materials of seals applicable to high-pressure and high-temperature environments.
Metallic foils Materials of thermal-radiation and abrasion-resistant seals.
Hard materials (Cemented carbide, ceramics, special steel, etc.) Used in combination with soft materials. Mechanical seals
Soft materials (Carbon, copper alloy, PTFE, etc.) Used with hard materials in sliding motion.
Reciprocating seals, lip Gaskets, squeeze gaskets, reciprocating oil seals Nitrile rubber (NBR) Materials of general-purpose, heat-resistant, cold-resistant, and oil-resistant seals Lip Gaskets, squeeze gaskets, oil seals
Urethane rubber (AU) Materials of high-strength and abrasion-resistant seals. Lip Gaskets, squeeze gaskets
Silicone rubber (VMQ) With a wide operating temperature range but low oil resistance. Squeeze gaskets
Fluororubber (FKM) Materials of heat-resistant, oil-resistant, and abrasion-resistant seals Lip Gaskets, squeeze gaskets
Polytetrafluoroethylene (PTFE) Materials of abrasion-resistant and chemical-resistant seals Slip rings, back-up rings
Polyamide resin (PA) Materials of abrasion-resistant and high-strength seals Back-up rings
Isolation seals, boots, dust covers, diaphragms, accumulators Chloroprene rubber (CR) Materials of weather-resistant and flex-resistant seals Boots, dust covers, diaphragms
Nitrile rubber (NBR) Materials of general-purpose seals Diaphragms
Fluorosilicone rubber (FVMQ) Materials of fuel-resistant seals Diaphragms
Ethylene propylene rubber (EPDM) Materials of gas-tight and water-resistant seals Diaphragms, boots, dust covers
Fluororubber (FKM) Materials of heat-resistant and chemical-resistant seals Diaphragms, dust covers
Magnetic fluid seals Hydrocarbon magnetic fluid General-purpose materials HDD, etc.
Fluorine magnetic fluid Magnetic fluid for heat-resistant applications Vacuum devices, etc.
Gaskets Non-metallic gaskets Superior in sealing property due to its soft property O rings, rubber sheets, PTFE sheets
Semi-metallic gaskets Using metals and non-metals in combination Metallic jacket gaskets, spiral gaskets
Metallic gaskets Used under severe conditions such as high temperature or high pressure Metallic O rings, metallic flat gaskets

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