The Pump Room
Blog style practical advice and industry insights to help keep your systems running smoothly.
Why material compatibility matters when choosing a pump
When selecting a pump for your industrial process, one of the most overlooked yet critical factors is material compatibility.
Choosing the right materials for the pump’s wetted parts can make the difference between years of trouble free operation and frequent, costly breakdowns.
What Is Material Compatibility?
In simple terms, material compatibility refers to how well the materials used in a pump’s construction resist chemical attack or wear from the liquids they’re handling. Every liquid – whether it’s water, acid, solvent or slurry has unique properties that can affect metal and plastic differently.
For example:
Acids like hydrochloric acid will corrode stainless steel, but polypropylene or PVDF may handle them well.
Solvents can soften certain plastics or cause components to swell, become brittle or break, but are usually safe with PTFE (Teflon) or certain metals.
Abrasive fluids can wear down soft materials but are better handled with hardened alloys or ceramic-coated components.
Why It Matters
Pump Longevity: Using incompatible materials leads to corrosion, swelling, cracking or erosion, shortening the pump’s lifespan.
Operational Downtime: Failure due to material issues can bring production to a halt, costing both time and money.
Safety Risks: Leaks caused by chemical attack can be hazardous to your team and the environment.
Warranty Voids: Many manufacturers won’t honor warranties if the pump was used with incompatible liquids.
Key Components to Consider
Not all parts of the pump are exposed to the liquid so it’s essential to focus on the wetted parts:
Pump body/casing
Diaphragms or any flexible parts
Seals and gaskets
Check Valves and seats
Shafts and impellers or any components rotating in the liquid
Did you know?
Most pump manufacturers publish compatibility charts showing how different materials perform with various liquids.
Some common material options found in pumps
Material | Best For | Notes |
|---|---|---|
| Stainless Steel | Water, mild chemicals, food | Not great with acids |
| Polypropylene | Acids, cleaning agents | Low cost, wide chemical range |
| PVDF | Aggressive chemicals | Excellent resistance, higher cost |
| PTFE (Teflon) | Solvents, acids | Chemically inert, but soft |
| Cast Iron | Oils, water | Inexpensive, not chemical resistant |
| Hastelloy / Alloy 20 | Harsh acids | High-end, very resistant |
| Buna-N, Viton, EPDM | Seals | Each suited for different chemicals or oils |