... REACH approved. 4.Most competitive price. Details about round rubber washer: Materials Comply with ROHS, NBR, Silicone (VMQ), EPDM, Viton, etc ... own mold workshop. 6 CNC machines, 2 EDM machines and computerized machining machines. 4. 20 sets of compression machines and 2 ... .5. Small order quantity is welcomed. Aging resistant round rubber washer