When choosing a dosing pump, it is essential to fully understand the materials used in the fluid- touching components. These materials determine not only the chemical resistance of the pump, but also its service life, safety and suitability for specific applications such as dosing acids, bases, solvents or disinfectants. Emec dosing pumps use a series of standard abbreviations to designate the materials used. Without an understanding of these abbreviations, it can be difficult to judge whether a pump is suitable for your chemical medium or operating conditions. Below, the most common material abbreviations are clearly explained so you can make the right choice with confidence.
Pumphead materials
PVDF - Polyvinylidene fluoride
Properties
- High chemical resistance
- Temperature range: -10 to +65 °C
- Resistant to aggressive acids and bases
- High mechanical strength
FP - Fluoroplastic (PVDF - Polyvinylidene fluoride)
- Features:
- High chemical resistance
- Temperature range: -40 to +140 °C
- Resistant to aggressive acids and bases
- High mechanical strength
PP - Polypropylene
Properties
- Suitable for less aggressive chemicals
- Lightweight and cheap
- Temperature range: -10 to +40 °C
- Not suitable for solvents such as toluene or acetone
SS - Stainless Steel (usually AISI 316L)
Properties
- Very high mechanical strength
- Highly suitable for high temperatures and pressure
- Temperature range: -10 to +90 °C
- Excellent corrosion resistance in many applications
PMMA - Polymethyl methacrylate
Properties
- Commonly used in self-venting pumps such as AMS LPV
- Transparent material, convenient for visual inspection
- Suitable for high-viscosity liquids
PMMA - Polymethyl methacrylate
O-ring materials
EPDM - Ethylene-Propylene-Diene Monomer
Properties
- Good resistance to heat, water, acids and bases
- Not suitable for oils and hydrocarbons
FKM - fluorocarbon rubber (e.g. Viton®)
Properties
- High chemical and thermal resistance
- Suitable for solvents, oils, acids and gases
Ball materials in non-return valves
Ceramic
Properties
- Very hard and wear-resistant
- Excellent resistance to chemical attack
- Often used in PVDF and PP pumpheads
Stainless steel
Properties
- Mechanically strong
- Used in combination with SS pump heads