Gasket （NBR）是什么的缩写？

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Expansion joints

Sliding type expansion joints shall be generally used for ballast, bilge, fire main, cable protection pipes, etc. where necessary to protect the pipes from the expansion and contraction.

Gasket for expansion joints shall be of NBR in general.

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NITRILE BUTADIENE RUBBER (NBR) GASKET

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中文翻译为氯丁橡胶。