本规范涵盖模制环形式的耐燃油和低温丁腈橡胶（NBR）。这些环通常用于挠性联轴器中的压盖式填料和密封件，用于需要耐燃油的-55°C至100°C（-67至212°F）温度下，但使用不限于此类应用。

This specification covers a fuel and low-temperature resistant butadiene- acrylonitrile (NBR) rubber in the form of molded rings.These rings have been used typically for gland type packings and seals in flexible couplings for use at temperatures from -55 degrees to 100 degrees C (-67 to 212 degrees F) where resistance to fuel is required, but usage is not limited to such applications.