AOK Valve Stem Seals specializes in producing high-quality, customized oil seals that meet customer specifications, offering reliability, durability, and efficiency.

AOK assists customers in selecting each metal and rubber material, each with distinct characteristics and applicable ranges.

AOK Valve Stem Seals Rubber Materials

RubberCharacteristicsLimitations
Fluoro Carbon Rubber (FPM/FKM/Viton) High-performance rubber
Good resistance to various media
Excellent performance under high tempterature
Excellent resistance to ozone, weathering, oxygen, mineral oil, fuel oil, hydraulic oil, aromatic hydrocarbons, and various organic solvents and chemical substances.
Poor tensile and tear in heat
Not resistance to polar solvent
Poor extension
Polyacrylate Rubber (ACM) Good resistance to weathering and ozone
Better resistance to high temperature and oil than NBR.
Not resistance to alcohol and gasoline
Nitrile Rubber (NBR) Good oil resistance
Good water resistance
Poor weathering and ozone resistance
Not resistance to polar solvents (acetone, ether)
Hydrogenated Nitrile Rubber (HNBR) Good performance under high temperature
Better heat resistance, ozone resistance, chemical resistance, and mechanical strength than NBR.
Not resistance to gasoline and ethanol fuel
Not resistance to polar solvents such as esters, ether, ketone, and aniline.
Ethylene Propylene Rubber (EPDM) Good resistance to weathering and ozone
Excellent resistance to sunlight
Excellent flexibility under low temperature
Chemical resistance
Electrical isolation
Poor resistance to oil
Silicone Rubber (SI) Excellent resistance to heat, weatheringing and ozone
Resistance to lubricating oil
Resistance to chemicals and solvents
Low tensile strength
Poor resistance to tear and wear
Poor resistance to fuel
AEM (Vamac) Excellent resistance to heat, hot mineral oil, fluids and weatheringing
Resistance to ozone
Poor resistance to low aniline oil
Poor resistance to gasoline and ethanol fuel

Rubber Materials Properties

☆ Excellent ● Good ■ Suitable △ Limited ▼ Poor
 EPDMNBRACMSIFPM
Tensile Strength
Elongation
Rebound Resistance
Tear Resistance
Abrasion Resistance
Impact Strength Resistance
Gas Impermeability Resistance
Ozone Resistance
Weatheringing Resistance
Flame Resistance
Heat Resistance
Low Temperature Resistance
Oil and Fuel Resistance
Animal and Vegetable Oil Resistance
Alcohol Resistance
Alkaline Resistance
Acid Resistance
Aliphatic-solvent Resistance-Aliphatic
Aliphatic-solvent Resistance-Aromatic
Oxygenated-Solvent Resistance
Water Resistance
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AOK Valve Stem Seals Metal Materials

MetalCharacteristics
Brass Corrosion resistance
Conductivity
Processability or Workability
Copper High conductivity
Thermal conductivity
Processability or Workability
SUS 304 Corrosion resistance
High temperature resistance
SUS 316 Corrosion resistance
High temperature resistance
Chemical resistance
Aluminum Corrosion resistance
Lightweighting
High strength
JIS G3141 SPCC Common used metal
Wide range of usage
JIS G3141 SPCC-1B Common used metal
Wide range of usage
JIS G3311 S50CM Medium and High Carbon Steel
JIS G3311 SK85M Medium and High Carbon Steel