Materials description of plastic pumps

Plastic pump material introduction (fluorine plastics, engineering plastics - ultra high molecular weight polyethylene) 

Fluorine plastic has excellent corrosion resistance. Fluoroplastic pump can almost resist all chemical media and have wear resistance to handle the fluids with temperature below 100℃.  Fluorine plastic pump such as Kenshine-pump model: IHF, FSB, FZB and other pumps 

Ultra high molecular weight polyethylene (UHMWPE) has excellent chemical resistance. Except for strong oxidizing acid, it can withstand other acids within concentration 35%. UHMWPE pump can handle the acid fluids with temperature below 90℃ and have wear resistance.  Corrosion-resistant and wear-resistant pump, Kenshine-pump model: UHB-ZK, HFM, YSF and other pumps 

Fluoroplastic pump material introduction 

(Excellent corrosion resistance, wear resistance) 

The called tetrafluoride pump is not made of tetrafluoride material, tetrafluoride material is not suitable to produce the pumps. 

Fluorine plastics generally refers to materials: such as: F46(FEP), F4, PFA, PVDF, F26, F50 and so on. 

Materials are used to manufacture pumps such as 1, polyperfluorinated ethylene propylene (F46/FEP), 2, polyvinylidene fluoride (PVDF), 3, fluorine alloy (F50). 

Polytetrafluoroethylene PTFE (not used as pump material) 

PTFE is also called as Teflon, PTFE application temperature range of -200~+260℃.  Decomposition temperature is 415℃ 

PTFE has excellent corrosion resistance and heat resistance, in addition to molten metal lithium, potassium, sodium, chlorine trifluoride, oxygen trifluoride at high temperature, high flow rate of liquid fluorine, it can almost resist all chemical media (including concentrated nitric acid and chloroazotic acid).  It can be operated at 230~260℃ for a long time, and its heat resistance exceeds that of most plastics.  It has excellent electrical properties, anti - viscosity and low friction coefficient.  The disadvantage is that it is expensive and difficult to process.  On the other hand, the advantages of anti - viscosity and anti - solvent complicate the lining process.  PTFE is widely used as gaskets, sealing rings, bearings and short tubes without lubricants, especially suitable for high temperature, serious corrosion, and products (such as food and textiles) are not allowed to be connected with lubricants.  Also used as pipes, valves, pumps, towers and linings.  Hose (graphite powder added) can be used to make heat exchangers.  It is also widely used in mechanical and electrical industry.  Products in addition to plastic, but it is also widely used as a coating and can also be made into fiber. 

Polyperfluorinated ethylene propylene F46/FEP (the most used material for corrosion resistant pumps, IHF, FSB pumps, etc.) 

Polyperfluorinated ethylene propylene F46/FEP is a copolymer of tetrafluoroethylene and hexafluoropropylene, therefore, also referred to as F-46.  Excellent corrosion resistance, similar to PTFE.  In addition to a few media such as molten alkali metal, fuming nitric acid, chlorine fluoride, almost all chemical media (including concentrated nitric acid and aqua regia) corrosion.  Temperature resistance is lower than PTFE, F46 can be used for a long time at 200℃.  Excellent impact resistance, creep resistance and dielectric properties.  It is easier to process than PTFE. The application range of F46 is -20~+140℃, and the decomposition temperature is 316℃ 

Polyvinylidene fluoride PVDF (CQF,QBY pump, etc.) 

Polyvinylidene fluoride PVDF has higher strength in fluorinated plastics.  Wear resistance, low cold current effect, excellent electrical insulation.  Corrosion resistance is good, but hydrogen atoms are retained in the structure, so it is slightly worse than other plastics.  It has good corrosion resistance to halogen, halogenated hydrocarbon, strong oxidant, boiling acid, alkali and a variety of organic solvents, but it has no corrosion resistance to fuming sulfuric acid, concentrated heat sulfuric acid and nitric acid, ketone, ester, amine and high temperature sulfonating agent above 90℃.  The disadvantage of fluoride is that plastic creep may occur under load 

It is the only material of fluorine plastics that can be made into hard tubes. PVDF is widely used in chemical pipelines, pumps, valves, gaskets, linings and so on. PVDF Can also be used as a coating.  It is also widely used in electrical equipment. 

Fluoroplastic alloy F50 

Fluorine plastic alloy (not metal alloy, is a mixture of two kinds of plastic) is made of F4 powder and F46 powder, through the ratio, fully mixed, so that it is evenly stirred together, and then through high temperature sintering, and hot-pressing molding.  It is a material developed in the late 1980s. In order to save some costs, F4 which is not easy to process is mixed with F46 to improve the performance of melt forming. F46 has good flow performance under high temperature and can flow with F4.  This material is named fluorine alloy.  Fluorine alloy is more resistant to high temperature than pure F46, higher strength, but its disadvantage is still more difficult to shape, many workpieces are not made of fluorine alloy material, therefore, the fluorine alloy pump we produce is not for the whole fluorine alloy. F50 is suitable for the processing of some parts.  Such as plastic pump body, centrifugal pump impeller, pump cover and other simple components. 

Ultra high molecular weight polyethylene (UHMW-PE) is a thermoplastic engineering plastic with linear structure and excellent comprehensive properties.  (Corrosion and wear resistance) 

UHMWPE high molecular weight (THE molecular weight of HDPE is usually only 20 ~ 300,000) gives its excellent performance, UHMWPE belongs to the price is moderate, excellent performance of thermoplastic engineering plastics, it almost focuses on the advantages of all kinds of plastics,  With ordinary polyethylene and other engineering plastics incomparable wear resistance, impact resistance, self-lubrication, corrosion resistance, impact absorption, low temperature resistance, health and non-toxic, not easy adhesion, not easy water absorption, small density and other comprehensive properties 

Wear resistance (UHMWPE has the highest wear resistance of plastics and exceeds some metals) 

Impact resistance (The impact strength of UHMWPE is among the best among all engineering plastics) 

Chemical resistance :UHMWPE has excellent chemical resistance, in addition to strong oxidizing acid, in a certain range of temperature and concentration of various corrosive media (acid, alkali, salt) and organic media (except tea solvents). 

Impact energy absorption (UHMWPE has excellent impact energy absorption, impact energy absorption value is the highest in all plastics, so the noise damping performance is very good, with excellent chipping effect.) 

Low temperature resistance :UHMWPE has excellent low temperature resistance and ductility at liquid helium temperature (-269℃), so it can be used as a low temperature resistant component in the nuclear industry. 

Hygienically non-toxic (UHMWPE is hygienically non-toxic, fully compliant with the Standards of the Japan Health Association and approved by the US Food and Drug Administration and THE US Department of Agriculture for use in contact with food and drugs.) 

Non-viscosity (UHMWPE surface adsorption capacity is very weak, its anti-viscosity ability is second only to PTFE in the plastic non-viscosity best, so the product surface and other materials are not easy to stick.) 

Low water absorption (UHMWPE water absorption rate is very low;  Generally less than 0.01%, so in the molding process before the general need not dry treatment. 

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