PBT is Widely Used For:

  • Valves
  • Filler pistons
  • Bearings and bushings
  • Gears and wear pads
  • Packaging machinery parts
  • Food processing machinery components
  • Wheels and rollers
  • Electrical components

Performance Characteristics:

  • Excellent chemical resistance including resistance to many CIP (clean in place)
    wash-down solutions
  • Low moisture absorption
  • Excellent wear resistance, even in wet environments
  • Excellent machining characteristics
  • Stain resistance

Common Brands:

  • HYDEX®
  • VALOX®


Strong, stiff plastic, excellent machining characteristics, bearing and wear, and chemical resistance

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

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SHEET Dimensions:
12 in x 24 in – 24 in x 48 in
.250 in – 2.500 in
ROD Outside Diameter:
0.250 in – 6 in
COLOR Natural, Black, Blue

Length, width, thickness, and diameter tolerances vary by size, by manufacturer, brand, and grade. Custom sizes available upon request.


PBT Properties and Material Options

PBT Unlubricated– HYDEX® 4101 has been designed to provide users with polyester based material that is able to withstand the higher levels of impact often associated with industrial environments. It is a very good wear material in addition to having low moisture up-take, and good dimensional stability. HYDEX® 4101 is FDA compliant.

PBT Lubricated– HYDEX® 4101L is the lubricated version of HYDEX® 4101 and is FDA compliant.

Optical, Metal, and X-Ray Detectable PBT– HYDEX® 4101 UD is an FDA compliant food grade blue PBT for food processing and conveyor applications requiring detectable materials. It is visible to all three detection types: optical inspection systems, x-ray detection systems, and metal detection systems. 

Tech Tip– PBT is ideal for applications such as cams, bearings, gears, food pistons, wear strips, scraper blades, valve bodies and conveyor components.


Typical properties of PBT
Tensile strength psi D638 8,690 7,200
Flexural modulus psi D790 330,000 390,000
Izod impact (notched) ft-lbs/in of notch D256 1.5 0.7
Heat deflection temperature @ 264 psi °F D648 130 195
Maximum continuous service temperature in air °F   245 221
Water absorption (immersion 24 hours) % D570 0.08 0.07

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

Explore the physical, mechanical, thermal, electrical, and optical properties of PBT.

Sort, compare, and find the plastic material suited for your application using our interactive properties table.


PBT Comparison Charts: Impact Resistance of PBT vs PET and Coefficient of Friction of PBT