What is the best material for acid and alkali resistant pumps?

　　Most of the acid and alkali pumps can be acid-resistant principle is mainly the pump material, general acid and alkali pumps are non-metallic material for the pump flow parts materials, such as “polyethylene, polypropylene, polyperfluoroethylene propylene, etc.,” which polyperfluoroethylene propylene is one of the good acid-resistant material, basically can be resistant to the corrosion of any acidic medium, known as the king of plastics. called the king of plastics.

　　There is usually a misunderstanding that stainless steel is a “universal material”, regardless of what medium and environmental conditions are held out of stainless steel, which is very dangerous, the real stainless steel is stainless steel acid-resistant steel short, resistant to weak corrosive mediums such as air, steam, water, or with stainless steel is called stainless steel, and will be resistant to chemical corrosive mediums (acids, alkalis, salts) corrosion. Chemical corrosion) corrosion of steel is called acid-resistant steel, stainless steel is not everything!!!!

　　In the electroplating industry is used for a variety of acid and alkaline liquid transfer; in the PBC industry is used in PCB etching equipment; in the environmental protection industry is used in waste gas, waste water treatment.

　　Which is the best material for acid and alkali resistant pump

　　Pump materials are: FRPP, CPVC, PVDF, PPS, each material has its own characteristics and properties suitable for pumping different acids, it is very important to choose the right pump material for each chemical application.

　　Polypropylene (PP)

　　It is a thermoplastic material that is extremely resistant to many solvents, bases and acids (e.g. acetone, caustic soda and hydrochloric acid).

　　It is not suitable for concentrated oxidizing acids.

　　It is used in many different industries for parts subjected to relatively small forces.

　　PP pumps have a temperature range of 4° to 60°C.

　　2. Polyvinylidene fluoride (PVDF)

　　It is a fluoropolymer family of thermoplastic materials typically used for specialized applications requiring high purity, strength and resistance to solvents, acids, salt solutions, alkalis and bases.

　　It is mainly used for liquids such as sodium hypochlorite, concentrated sulfuric acid, nitric acid, and gasoline.

　　It does not deform under load and has a high mechanical resistance.

　　The temperature range of PVDF pumps is from -40° to 90°C.

　　3、Stainless steel AISI316

　　It is a metallic material when the properties and corrosion resistance of steel are required.

　　It is particularly suitable for pumps using high temperature liquids, oil, kerosene, and alcohol.

　　It is used for pumping acids up to a temperature of 160°C

　　In addition, O-rings are in contact with liquids, and their material is very important to avoid leakage.

　　4、Ethylene-propylene rubber

　　It is an elastomer with good resistance to heat, ketones, common dilute acids and alkalis.

　　Temperature range: -40°C to 140°C

　　We usually use EPDM O-rings as standard for PP pumps.

　　5、Fluoroelastomer

　　It is a fluoropolymer elastomer with good resistance to hydrocarbons, acids, fuels, mineral and vegetable oils, but is incompatible with ketones and organic acids

　　Temperatures up to 150°C

　　We typically use VITON as standard for PVDF and AISI316 pumps

　　6、Polytetrafluoroethylene

　　Polytetrafluoroethylene is also known as Teflon.

　　It is highly resistant to acid and alkali attack in corrosive environments, but its mechanical properties such as traction and compression are poor.

　　Temperature range: 4°C to 260°C

　　These are general rules that can be used to select pump materials, but it is also necessary to consult a good chemical compatibility chart in order to select the best material for each chemical application.