plastics check valve PVC check valve RPP check valve
Enhancement Polypropylene(RPP)tubing performance index RPP pipe materials are produced according to HG20539-92 issued by Department of Chemical Industry, it is extruded and formed with the raw materials of high-quality fiber glass RPP, it fills the limitation occurred in RPP with low mechanical strength and has excellent anti-corrosive performance in RPP, moreover, the operating temperature(-14～ low cost, long service life and convenient installation etc., it is the top choice of corrosive resistance in the industries like petroleum, chlorine alkaline, chemical fiber, dyestuff, pesticide, light industries, sewage disposal and so on. PVDF(Polyvinylidene fluoride)is nominated as F molecular formula is ∈CF2-CH2∈n and molecular weight is 400-600 thousand. PVDF is one of fluoride plastics developed in 1960s, it is a homopolymer monomer formed under the actions of trifluoroethene, hydrofluoric acid and zinc dust, and polymerized into white crystalline solid. The molecular structure of PVDF has large regularity, where fluoric and hydrogen atoms is similar at their sizes, the linage of macromolecular chains is compact and has strong hydrogen bond effects, therefore, the tensile strength, compressive strength and impact toughness of polymer is relatively high. The melting point of PVDF is low(about so it has excellent performance of processing, easy shaping, it can be processed with general methods for thermal plastic like injection, die press, extrusion and blow molding etc.. PVDF has excellent chemical stability, excellent chemical resistance and good thermal resisting stability, it can be long operated within the temperature range from it is one of perfect insulation materials with a high dielectric constant, which can resist all mediums like salt, acid, alkaline, arene, halogen and so on except for hydrochloric acid and strong solvent. It also enjoys the merits like no flame, breaking resistance, wear resistance and good self lubricating property, Though its raw materials are imported with high price and onetime investment, its price is greatly lower than imported pope materials, it will bring you with obvious compressive economic effects on the basis of excellent corrosive resistance, incomparable service life, high safety coefficient and little maintenance.
