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we will supply you backing-up seals ,KZT contained 38% copper powder.Regarding Backing seals,there are two different type. non-copper powder and contained copper powder. Contained copper powder can reinforce heat dissipation.
So please consider we are the most specialist in more reliable seal kits,If any problems,we will have a good solution for you.
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.
but we supply is NBR90°,it no smell and have good performance.
please welcome to http://www.yfh-excavatorseals.com