本规范涵盖模制环形式的硅橡胶（VMQ）。这些环通常用作-65至+260°C（-85至+500°F）与空气接触的密封圈，但用途不限于此类应用。此类环的横截面直径或厚度通常不超过0.275英寸（6.98毫米）。

This specification covers a silicone (VMQ) rubber in the form of molded rings. These rings have been used typically as sealing rings for service from -65 to +260 ¿¿C (-85 to +500 ¿¿F) in contact with air, but usage is not limited to such applications. The cross-section of such rings is usually not over 0.275 inch (6.98 mm) in diameter or thickness.