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we supply is NBR90°,it no smell and have good performance.Regarding O-rings, most important is the hardness.for the moment, there are two different materials NBR70°to90° or FPM75to 95.NBR materials have good performance on high pressure is more suitable for excavator and
FPM materials have good performance on high temperature it good for hydraulic breaker.
If any requirements,please welcome to http://www.yfh-excavatorseals.com