Secondly, deep fitted sheets are made from high-quality materials that are designed to last. They are often made from cotton or a blend of cotton and polyester, which are breathable and durable They are often made from cotton or a blend of cotton and polyester, which are breathable and durable

Viton (FKM/FPM) Oil Seals
Oil seals are made from multiple compounds and materials. Some of the oldest, still in use today, are leather and felt compounds. The trend in mass production, however, has seen a move towards synthetic rubber or elastomers. Nitrile is by far the most popular material but developments in PTFE have created a surge of interest in buyers needing seals for high-speed shaft rotation applications. Viton is taking over from the polyacrylic and silicone, as it works better in high-temperature applications and has a high-resistance to abrasion and harmful chemicals.
Conventional oil seals are the traditional seals, which can be recognised by a spring on the inside. These oil seals are made of a metal housing that contains a rubber seal. This part is often made of elastomer and comes into contact with the surface of the rotating shaft.

Figure 5: JTEKT seal numbering system
Table 6: Codes and numbers used in seal numbers