Polyester, on the other hand, is a synthetic material that is known for its wrinkle resistance and durability. Polyester sheets are often more affordable than cotton sheets, making them a budget-friendly option. They are also easy to care for and dry quickly, making them a convenient choice for busy households. However, polyester is not as breathable as cotton and can trap heat, making it less comfortable for hot sleepers
Extrusion and Nibbling
Oil seals come in various shapes to fit the machines and substances to be sealed.
Figure 2 shows the structure and the names of the various components of the most typical oil seal.
The functions of the various components are also indicated in Table 1.
Classical oil seals consist of a metal housing that carries the dynamic sealing lip and provides the static sealing function. These are usually manufactured of elastomer material, such as ACM, Silicone or FPM. Further, since they are in contact with the surface of the rotating shaft, the lip is pressed onto the shaft surface by means of a spring ring.
3) Seal numbering system

Seals are classified by O.D. wall material, lip type, and whether they have a spring or not.
Major oil seals are specified in ISO 6194-1 and JIS B 2402-1.
Table 2 shows the common types of oil seals, while Table 3 shows the features of each type of oil seal.
Table 4 lists the JTEKT oil seal type codes and corresponding ISO and JIS standards.
When selecting oil seals for wheel hubs and steering mechanisms, it is essential to prioritize quality, durability, and compatibility with specific vehicle models. High-quality oil seals are designed to withstand the demanding conditions of automotive operation, providing reliable sealing solutions that contribute to the overall performance and safety of the vehicle. Choosing reputable suppliers and manufacturers known for producing high-quality oil seals is crucial to ensure the reliability and longevity of these critical components.
O.D. (outside diameter) surface The O.D. surface affixes the oil seal to the housing and prevents leakage , through the fitting area, of substances to be sealed, while excluding contaminants.
Helix Seal
The 40mm rubber gasket is a versatile sealing solution that is commonly used in plumbing systems, automotive engines, hydraulic systems, and other machinery where a tight seal is required. Made from high-quality rubber materials, these gaskets are designed to withstand high temperatures, pressure, and chemicals, making them suitable for a wide range of applications.