Plastic vs. Metal Pumps: Which Should I Choose?
When to Choose a Plastic Pump
Plastic pumps are commonly used when chemical and corrosion resistance are priorities. Materials such as polypropylene (PP) and PVDF can handle many chemicals that may attack certain metals.
Plastic pumps are commonly used for:
- Acids and caustics
- Water treatment chemicals
- Corrosive chemical transfer
- Chemical dosing
- Applications where corrosion is a concern
Polypropylene is a versatile and economical option for many chemical applications, while PVDF is often selected for more aggressive chemicals or demanding conditions.
When to Choose a Metal Pump
Metal pumps offer excellent durability and mechanical strength. Common materials include aluminum, cast iron, and stainless steel.
Metal pumps are commonly used for:
- Oils and petroleum-based fluids
- Solvents
- High-temperature applications
- Abrasive or demanding industrial processes
- Food and beverage applications when suitable stainless steel construction is required
Stainless steel is especially useful when corrosion resistance, strength, temperature capability, or sanitary construction is important.
Plastic vs. Metal: Quick Comparison
| Consideration | Plastic | Metal |
|---|---|---|
| Corrosion Resistance | Excellent | Depends on metal |
| Chemical Resistance | Excellent with compatible materials | Varies by chemical |
| Weight | Lighter | Heavier |
| Mechanical Strength | Moderate | High |
| Temperature Capability | Typically lower | Typically higher |
| Cost | Often lower | Often higher |
So, Which Should You Choose?
There isn't one material that's best for every application. Start by identifying the fluid, chemical concentration, temperature, pressure, viscosity, and presence of solids or abrasives.
And remember: the pump housing isn't the only material that matters. Diaphragms, seals, O-rings, valve balls, and other wetted components must also be compatible with the fluid.
At Pumping Solutions, our pump experts can help evaluate your application and determine which pump and material combination makes sense. If you're deciding between plastic and metal—or aren't sure where to start—contact our team and we'll help point you in the right direction.