... The raw material of O-rings are 100% rubber,It plays a role in sealing and be ... a green product.It certificates SGS,FDA,RoHS. Rubber O-rings:1.Material: Rubber2.Certificate:SGS, FDA,RoHs3.Color:any ... acids, bases, solvents, chemicals, oils and water. Notes:1. It will not be affected by the encounter water ... deformation, please note that when using. Advantage of us:(1) As a FACTORY started in 2005, we own ...