Products Description
| Color |
Black, white, etc |
| Material Used | ACM |
| In-process testing performed | Customer Life-Test |
| Application |
Automotive industry |
Characteristics of Automotive Valve Stem Seals
Valve stem seals are key components in internal combustion engines and despite their small size, their functionality is vital. Key features include:
- Oil sealing function: The main function of the automotive valve stem seals is to prevent oil from entering the combustion chamber through the gap between the valve stem and the valve guide, thereby ensuring that only air and fuel enter the combustion chamber, avoiding increased oil consumption and carbon deposits.
- Lubrication function: They help maintain the oil film around the valve stem, ensuring that the valve stem is properly lubricated during movement and reducing wear.
- Heat dissipation: Valve stem seals also participate in dissipating the heat generated by the valve during operation, helping to maintain engine performance and prevent overheating.
- Emission control: Good valve stem seals help control emissions and prevent oil from entering the combustion chamber, resulting in poor exhaust composition.
| Physical properties | Nominal | Units |
|
Hardness ASTM D 2240, 23ºC |
70-75 | Shore A |
|
Tensile strength ASTM D 412, 23ºC |
> 80 | Kg/cm2 |
|
Elongation at break ASTM D 412, 23ºC |
> 200 | % |
|
Compression set ASTM D 395, 150ºC, 22 h, 25 % |
< 50 | % |
| Air Ageing ASTM D 573, 150ºC, 70 h |
||
| Hardness Change | <(+10) | Points |
| Tensile Change | <(-25) | % |
| Elongation Change | <(-30) | % |
|
Fluid Resistance, IRM-901 ASTM D 471, 150ºC, 70 h |
||
| Hardness Change | -5 to+10 | Points |
| Tensile Change | <(-20) | % |
| Elongation Change | <(-30) | % |
| Volume Change | -5 to +5 | % |
|
Fluid Resistance, IRM-903 ASTM D 471, 150ºC, 70 h |
||
| Hardness Change | -15 to +5 | Points |
| Tensile Change | <(-40) | % |
| Elongation Change | <(-40) | % |
| Volume Change | 0 to +25 | % |
| Operating Temperature | -10 to 170 | ºC |
| Physical & Mechanical Properties | |
| Durometer or Hardness Range | : 40-90 Shore A |
| Tensile Strength Range | : 500 - 2500 PS |
| Elongation (Range%) | : 100% - 450% |
| Abrasion Resistance | : Fair to Good |
| Adhesion to Metal | : Fair to Good |
| Adhesion to Rigid Materials | : Fair to Good |
| Compression Set | : Poor to Good |
| Flex Cracking Resistance | : Fair to Good |
| Impact Resistance | : Poor |
| Resilience/Rebound | : Fair to Good |
| Tear Resistance | : Poor to Good |
| Vibration Dampening | : Good to Excellent |
| Thermal Properties | 30F to 400F |
| General Temperature Range | |
| Min. for continuous Use (Static) | :-30F |
| Brittle Point | : -40F |
| Max. for Continuous Use (Static) | : 400°F |
| Chemical Resistance | |
| Acids, Dilute | : Fair |
| Acids, Concentrated: Poor to fair | |
| Acids, Organic (Dilute) | : Poor |
| Acids, Organic (Concentrated) | : Poor |
| Alcohols | : Poor |
| Aldehydes | : Poor |
| Alkalies, Dilute | : Fair |
| Alkalies, Concentrated | : Fair |
| Amines | : Poor |
| Animal & Vegetable Oils | : Good |
| Brake Fluids, Non-Petroleum Based | : Poor |
| Diester Dils | : Good |
| Esters, Alkyl phosphate | : Poor |
| Esters, Aryl Phosphate | : Poor |
| Esthers | : Poor |
| Fuel Aliphatic Hydrocarbon | : Excellent |
| Fuel, Aromatic Hydrocarbon | : Poor to Good |
| Fuel, Extended (Oxygenated) | : Fair to Good |
| Halogenated Solvents: | Poor to Good |
| Hydrocarbon, Halogenated | : Poor to Good |
| Chemical Resistance | |
| Refrigerant Halofluorocarbons | : R-11 R-12 R-13 |
| Refrigerant Halofluorocarbons w/ Oil | : R-11 R-12 R-13, R22 |
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