Fluorocarbon rubber FKM o-ring has good properties of non-flammability and low gas permeability,has excellent resistance to ozone,weathering and aging.Technical DataOperating temperature: -20 / +200 ℃. Special formulas FKM can resistance from -40℃ to +230 ℃Dimensions:Standard: AS568, BS1806,ISO3601,JIS B2401,DIN3771,NFT 47-501Nonstandard FKM o-rings available.Color:Black,green,brown,etc.Hardness: 50 shore A, 60 shore A,70 shore A,80 shore A,90 shore A.Our Advantages:ISO9001 Certificate -High Quality Control?Subordinated manufacturing factories -Competitive price.RoHS certificate,REACH certificate,FDA certificate - Meet stringent industry requirementsResearch and Development team; -Providing specific sealing solutions for you?Good service:Your inquiry will be answered within 24 hours,if any problems after sales, http://www.ostasos-seals.com/o-ring/o-ring-rubber/viton-o-ring.html