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Hydex® 4101L is a very stable chemical compound that can withstand high impact without deterioration. Hydex® 4101L uses a proprietary lubricating system that meets or exceeds Delrin AF. Unlike Delrin AF, Hydex® 4101L is approved for direct contact with food by the FDA and is ideal for machined parts in food processing equipment. Hydex® 4101L has excellent resistance to typical cleaning chemicals such as chlorine and caustic solutions and has a very low moisture absorption rate, as much as 15 times less than nylon.


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At a Glance

Generic Name
Polybutylene Terephthalate

Available In
Sheet, Rod

FDA, USDA, 3A Dairy Approved

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Stock Products Properties Applications Advantages


Sheet .25″ to 2″ 24” x 24” CTS, 24” x 48” CTS White and Black
Rod 3/16” to 4 ¾” (10’ Length 5” & greater (5’ Length) Varies by diameter White or Black

Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.


Physical PropertiesUnitsASTMResults
Density lb/in³ D792 1.36
Water Absorption, 24 hrs % D570 0.07
Mechanical PropertiesUnitsASTMResults
Tensile Strength @ yield psi D638 7200
Tensile Elongation @Break % D638 40
Flexural Strength psi D790 10,600
Flexural Modulus psi 390000
IZOD Impact Strength Notched ft-lb/in D256 0.7
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion (x 10^-5 in./in./°F)
Heat Deflection Temp at 264 psi °F D648 195
Melting Temperature °F 420
Max Operating Temp. °F 221


  • Bearings
  • Timing screws
  • Gears
  • Feeder blacks
  • Fuel pump components
  • Food pistons
  • Wear strips
  • Scraper blades
  • Cams
  • Conveyer components
  • Valve bodies


  • Good chemical resistance
  • High impact strength
  • Hard and durable surface
  • FDA, USDA, & 3A Dairy Approved
  • Low coefficient of friction
  • Low moisture absorption
  • Excellent machining qualities
  • No centerline porosity
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