Design standard: DIN3352-P4 Flange: DIN2501(GB17241.6-1998) Face to face dimension: DIN3202(ISO5752Working temperature: NBR≤80 degrees centigrade EPCM ≤120 degrees centigrade FPM≤160 degrees centigrade Testing standard: DIN3230(GB/T1392 7-1992) Normal pressure: 1.0MPa-1.6MPa Strength testing: 1.5MPa-2.4MPa Functional testing: 1.1MPa-1.76MPa Body, Bonnet, Top: GGG50 inside and outside with epoxy resign coating Wedge: GGG50 with NBR or EPDM or FPM coating Stem: Stainless steel 304, 1Cr13 Stem nut, bushing: D2 steel Middle rubber, O-ring: NBR Application: U-PVC, PE PIPE, especially suitable for underground pipe system.