PET vs. Nylon

Compare PET and Nylon to identify the best option for your project

Differences Between PET and Nylon

PET (polyethylene terephthalate) is a strong, stiff engineering plastic with excellent machining characteristics, chemical resistance, and bearing and wear properties. PET is often used for food processing machinery applications where low moisture absorption, low thermal expansion, resistance to staining, or resistance to cleaning chemicals is required.

Nylon is a strong, stiff engineering plastic with outstanding bearing and wear properties. Nylon is frequently used to replace metal bearings and bushings often eliminating the need for external lubrication. Other benefits include a reduction in part weight, less operating noise, and decreased wear on mating parts.

PET sheets | Nylon sheets, rods, and tubes

PET Material Characteristics

Nylon Material Characteristics

• Strong and stiff
• Excellent chemical resistance
• Excellent wear characteristics, even in wet environments
• Low moisture absorption
• Low thermal expansion
• Stain resistant
• Strong and stiff
• Good chemical resistance
• Reduced noise, weight, and wear of mating parts
• Excellent bearing and wear properties
• Easy to machine
• Easy to fabricate

PET Applications

Nylon Applications

• Food processing machinery components
• Packaging and machinery parts
• Bearings and bushings
• Wear pads
• Wheels and rollers
• Filler pistons
• Valve components
• Manifolds
• Food processing machinery parts
• Packaging machinery parts
• Bearings and bushings
• Wear pads
• Wheels
• Rollers
• Gears
• Seals and gaskets

PET Common Brands

Nylon Common Brands


Typical Properties of PET vs. Nylon

Property Units ASTM Test
PET Nylon
Specific gravity (73°F) - D792 1.38 1.14
Tensile strength (73°F) psi D638 11,500 12,400
Tensile elongation (73°F) % D638 70 90
Flexural modulus of elasticity (73°F) psi D790 400,000 410,000
Rockwell M&R, Durometer Shore D (73°F)
scale as noted D785,
M93, R125,
Shore D 87
M85, R121,
Shore D 80
Izod impact (notched, 73°F) ft-lbs/in D256 0.7 1.2
Coefficient of friction - Dynamic 0.25 0.28
Coefficient of linear thermal expansion in/in/°Fx10-5 D696 3.9 4.5
Heat deflection temperature (66 psi/264 psi) °F D648 240 / 175 - / 194
Maximum continuous service temperature in air °F - 230 210
Water absorption (immersion 24 hours) % D570 0.1 1.2

Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand. 

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