ORID O-Ring Rubber Material Identifier Tool for EP, NBR, FKM, FFKM by Marco Rubber & Plastics at Mass Fiscal Exposed. MPN: ORID. Hurry! Limited time offer. Offer valid only while supplies last. The ORID can help distinguish between FKM (Viton), FFKM (Kalrez), Nitrile (NBR Buna-N) and EPDM common o-ring materials of most size O-rings in standard 60 to 80 Durometer hardness. To determine an o-ring material, place the o-ring flat on a stable surface. Place the ORID firmly on the o-ring and raise the weight all the way to the top. Release the weight and let it drop onto the o-ring. It will bounce. The height of the height of the first bounce will indicate one of the four calibrated materia
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