- Polyurethane (PU) oil seals have become an indispensable component in various industrial sectors due to their exceptional performance characteristics and durability. These seals, made from a synthetic polymer, play a crucial role in ensuring the efficiency and longevity of machinery by preventing leaks and maintaining optimal lubrication.
- One of the key advantages of porcelain spark plugs is their ability to withstand high temperatures. As the spark plug is located inside the combustion chamber, it is exposed to extreme heat during the ignition process. The ceramic material used in porcelain spark plugs can tolerate these high temperatures without degrading, ensuring reliable performance even under strenuous conditions.
AVAILABLE OIL SEAL STYLES & MATERIALS
(1) Shaft speed Due to design and structural reasons, high-speed shafts should use high-speed oil seals, low-speed shafts should use low-speed oil seals, and low-speed oil seals cannot be used on high-speed shafts, and vice versa.
Polyacrylate is a great compromise between cost and quality. It has a high performing temperature and chemical range, but not to the extent of the range of Viton. The temperature ranges from 31°C to 148°C (-25°F to 300°F). Polyacrylate is primarily used in automotive transmissions and hoses but also found in shaft seals, gaskets and o-rings, due to offering a high resistance to hot oil and oxidation. While Polyacrylate is a great alternative to other high temperature resistant materials that are more expensive, it does have a poor water compatibility and cold flexibility. The best situation for Polyacrylate is an environment where heat and oil resistance but cost is the major issue. And while these 4 different materials cover a wide range of applications, there are even more materials out there designed for very specific niches in mind.
Silicone compounds or “VMQ” offers a wide range of traditional operating temperatures starting at -60°C to 200°C (-140°F to 392°F).
Figure 3: Sealing function of main lip radial load
* KOYO is a registered trademark of JTEKT.