The commonly used rubber material for automotive oil seals is nitrile rubber. Nitrile rubber is currently a commonly used rubber material due to its low cost and wide range of applications. In the daily manufacturing of oil seals, different rubber materials are selected based on the sealing medium (usage environment or occasion), usually including silicone rubber, fluorine rubber, polytetrafluoroethylene, polypropylene ester rubber, and so on.
1. Nitrile rubber
Nitrile butadiene rubber (made by lotion polymerization of butadiene and acrylonitrile) has poor cold resistance and relatively good heat resistance; The wear resistance increases with the increase of acrylonitrile content, with good water resistance and oil resistance, making it a widely used rubber in the sealing industry.
2. Silicone rubber
Silicone rubber has excellent weather resistance, extremely poor alkali resistance, weak wear resistance, and low tensile strength, so it is generally not used for dynamic sealing; Its high-temperature resistance is only lower than that of fluororubber, but its low-temperature resistance is among the best among rubber materials.
3. Fluorine rubber
Fluorine rubber has good oil resistance and poor cold resistance. Fluorine rubber is a stable and balanced rubber among all rubbers, and is also a good high-temperature resistant rubber in the rubber industry, with relatively high prices; Good wear resistance, suitable for dynamic sealing environments.
4. Acrylate rubber
Acrylate rubber has excellent oil resistance at high temperatures, but poor cold resistance and water resistance; The wear resistance is not as good as polyurethane rubber; Stable performance in lubricating oils containing phosphorus, sulfur, and chlorine additives.
5. Butyl rubber
Butyl rubber has good weather resistance, but is extremely resistant to water, ozone, and chemical corrosion; Self adhesion and mutual adhesion are poor, and compatibility is also poor. It is not suitable to use the same material together, and can only be used together with ethylene propylene rubber and polyethylene.
6. Ethylene propylene rubber
The aging resistance of ethylene propylene rubber is good, and its weather resistance and water resistance are also very good, with extremely high chemical stability, but its oil resistance is also very poor, as well as the self adhesion and mutual adhesion of butyl rubber.
PTFE has strong acid and alkali resistance, good antioxidant performance, high temperature and low temperature resistance, and excellent weather resistance; In solid materials, its friction coefficient is low, surface tension is small, resulting in high lubrication and strong non adhesion. But its radiation resistance is poor, and it will degrade after being subjected to high-energy radiation, and its elasticity is worse than other rubbers.
Due to the different specifications of automotive oil seals produced by each manufacturer, as well as the different materials and processing accuracy required by customers, Sealdo Technologies Corporation can conduct comprehensive calculations on rubber and plastic seal products according to customers' different needs and make a quotation for customers. We welcome everyone to consult with automotive oil seals.