Rubber Joint electrical machinery Hose: 1) Materials: silicone, NR, NBR 2) Functions: passing air, jointing ... .Certifications:FDA.ROHS.ISO9001,ISO14001,UL4.Characterstic:Ozone resistant,High/Low temperature resistant,Aging resistant,Oil resistant,Wearable etc.5.Hardness:40A--90A 6 ... to send me an E-mail. Rubber Joint electrical machinery Hose