谁知道NITRILE 70 Sh是什么材料？

月青

做密封圈用的好像，国内怎么叫的？

耐油丁腈橡胶呀！70sh是橡胶的开始变硬的温度。sh的意思是slow harden。
Temperature figures represent upper limits where given in conjunction with key letters, eg SH(80°C) = Slow Hardening above 80°C.

这样的后缀有：
VA — Vigorously Attacked
A — Attacked
SA — Slight Attack
SH — Slow Hardening
V — Volate
C — Fully Compatible
E — Embrittled
LS — Limited Serviceability
SS — Slight to Moderate Swelling
MS — Marked Swelling

实在是太感谢楼上的了！！！