How to Choose the Right Pump Material for Your Chemical
When selecting an industrial pump, flow rate and pressure are only part of the equation. One of the most important—and often overlooked—considerations is choosing a pump material that is compatible with the chemical being transferred.
Using the wrong material can lead to corrosion, swelling, cracking, leaks, premature wear, and costly downtime. Whether you're handling acids, caustics, solvents, or general process chemicals, selecting the proper wetted materials helps maximize reliability, improve safety, and reduce maintenance costs.
In this guide, we'll cover the most common pump materials, when they're typically used, and what factors you should consider before making your selection.
Why Material Compatibility Matters
Every chemical interacts differently with metals, plastics, and elastomers. A pump that performs well with one application may fail quickly in another if the materials are not compatible.
Choosing the right materials can help:
- Extend pump service life
- Reduce unexpected downtime
- Improve chemical resistance
- Prevent leaks and seal failures
- Lower long-term maintenance costs
Before selecting a pump, it's important to evaluate not only the pump housing but also the diaphragms, seals, O-rings, valve balls, and other wetted components that come into contact with the fluid.
Common Pump Housing Materials
Polypropylene (PP)
Polypropylene is one of the most popular plastic materials used in chemical transfer applications.
Best for:
- Mild acids
- Caustics
- Water treatment chemicals
- General chemical processing
Advantages
- Excellent corrosion resistance
- Lightweight construction
- Cost-effective
- Suitable for many industrial chemicals
PVDF (Kynar)
PVDF offers superior chemical resistance compared to polypropylene and is commonly used for more aggressive chemicals.
Best for:
- Strong acids
- Oxidizers
- Chlorine-based chemicals
- High-purity applications
Advantages
- Outstanding chemical resistance
- Higher temperature capability
- Excellent durability
- Long service life in demanding environments
Stainless Steel
Stainless steel pumps are ideal where strength, pressure capability, or sanitary requirements are important.
Best for:
- Solvents
- Oils
- Food and beverage
- Pharmaceutical processing
- High-temperature applications
Advantages
- High mechanical strength
- Excellent temperature resistance
- Durable construction
- Easy to clean
Aluminum
Aluminum pumps are commonly used for non-corrosive fluids where lightweight construction is preferred.
Best for:
- Petroleum products
- Oils
- Paints
- General industrial fluids
Advantages
- Lightweight
- Economical
- Good mechanical strength
Don't Forget the Elastomers
The pump body is only one part of the equation. Elastomers—including diaphragms, valve balls, seats, and O-rings—must also be compatible with your chemical.
Some of the most common elastomer options include:
Buna-N (Nitrile)
Commonly used for:
- Petroleum products
- Oils
- Fuels
EPDM
Ideal for:
- Water
- Dilute acids
- Caustics
Not recommended for petroleum-based fluids.
Viton (FKM)
Excellent for:
- Solvents
- Oils
- High-temperature chemicals
PTFE (Teflon)
One of the most chemically resistant materials available.
Excellent for:
- Strong acids
- Aggressive chemicals
- Corrosive applications
PTFE is often selected when maximum chemical compatibility is required.
Questions to Ask Before Selecting a Pump
Choosing the right material starts with understanding your application.
Consider the following:
- What chemical are you pumping?
- What is the chemical concentration?
- What is the operating temperature?
- Is the fluid abrasive?
- Does it contain solids?
- What flow rate and pressure are required?
- Will the pump run continuously or intermittently?
Even small differences in concentration or temperature can affect material compatibility.
Typical Material Selection by Application
| Application | Recommended Materials |
| Water Treatment | Polypropylene, PVC, PVDF |
| Chemical Processing | PVDF, Stainless Steel |
| Acids | PVDF, PTFE |
| Caustics | Polypropylene, EPDM |
| Solvents | Stainless Steel, Viton |
| Oils & Petroleum | Aluminum, Buna-N |
| Food & Beverage | Stainless Steel |
Always verify compatibility with the specific chemical and operating conditions before making a final selection.
Let Pumping Solutions Help
Choosing the right pump material isn't always straightforward. Temperature, concentration, pressure, and chemical composition all play a role in determining the best solution.
At Pumping Solutions, we help customers identify pumps and materials that match their specific applications. Whether you're transferring aggressive chemicals, dosing treatment chemicals, or upgrading an existing system, our team can help you select a reliable solution designed for long-term performance.
We offer pumps and accessories from leading manufacturers, including: