Plastic vs. Metal Pumps: Which Should I Choose?

When choosing an industrial pump, the material can be just as important as the pump type. Plastic and metal pumps each have advantages, but the right choice depends on several factors, such as the fluid, operating conditions, and application.

Here’s a quick way to understand the difference.

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 Materials: A 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

 

Which Pump Material Should You Choose?

Unfortunately, there isn't one material that's best for every application. To select the best material for your pump, start by identifying the fluid, chemical concentration, temperature, pressure, viscosity, and whether solids or abrasives are present. Consider the industry and application surrounding your pumping operations to determine whether plastic or metal is better suited for your projects.

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!

Contact Pumping Solutions for Pumping Advice and Expertise

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.