Material
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
| Rubber | Characteristics | Limitations |
|---|---|---|
| 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 | |||||
| EPDM | NBR | ACM | SI | FPM | |
|---|---|---|---|---|---|
| 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 | ☆ | ● | ▼ | ● | ● |
AOK Valve Stem Seals Metal Materials
| Metal | Characteristics |
|---|---|
| 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 |
