PVDF（Polyvinylidene fluoride）is nominated as F-2 in short, whose English Name PolyVinylidene Fluoride(PVDF in short),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 structurd 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 a nd impact toughness o of polymer is relatively high.The melting point of PVDF is low (about 170℃), s o it has excellent performance of processing,easy shaping,it can be processed with general methods for thermal pplastic like injection,die press,extrusion and blow molding etc..
PVDF has excellent chemical stability,excellent chemical resisitance and good thermal resisiting stability,it can be long operated within the temperature tange from-62℃ to 150℃,furthermore,it is one of perfect insulation materials with a high dielectric constant, which can rersisit 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 I mported with high price and onetime investment,its price is greatly lower than imported pipe materials,it will bring you with obvious compressive economic effects on the basis of excellent corrosive resistance,incomparable service life, high safty coefficient and little maintenance.
Ltem | Numerical value | Ltem | Numerical value |
Relative density | 1.76 | Pull and draw mould quality(MPa) | 840 |
Water—absorptivity（%） | 0.04 | Bend mould quality(MPa) | 1400 |
Crystal melting point(℃) | 171 | Compres mould quality(MPa) | 840 |
Embrittled temperature(℃) | ﹤-61 | Degree of hardness(HB) | 7 |
Compared to heat capacity(J/Kg·k) | 1170 | Friction coefficient(To steel) | 0.14 |
Linear expansion coefficient(K) | 80*10 | （60Hz）Dielectric coefficient | 8.40 |
PaThermal depormation temperature(℃),0.46M | 150 | (106Hz) | 6.43 |
1.86MPa | 90 | （60Hz）Dielectric loss | 0.05 |
Decomposition temperature(℃) | 316 | (106Hz) | 0.16 |
Opetating temperature scope(℃) | -40~150 | （Ω·cm）Volume resistance（Ω·cm） | 2*10 |
Longitudinal strength (MPa),25℃ | 49.2 | Disruptive strength（kv/m） | ＞10 |
100℃ | 35.2 | Arc resistance(s) | 50~70 |
Elongation ratio(%) | 30~400 | Flammability | From extinguishe |
Compressive strength(MPa) | 70 | Transparency | Transparent-Translucent |
Impact intensity（KJ/m ²） | 1.47*10 | Bears chemistry corrosiveness | Good |
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