Boltaron® 4320

New Technology Plastics is a distributor for Boltaron® 4320 materials. This ultra-high impact strength and low shrinkage make it ideal for orthotics and prosthetics applications and other uses requiring durability and dimensional stability in forming and in use.

PPSU plastic is an amorphous material, which has a high glass transition temperature and low moisture absorption. Furthermore, PPSU material has better impact strength and chemical resistance than PSU and PES from the Polysulfone group. Apart from these characteristics, PPSU polymer can withstand sterilization with superheated steam better than other members of this group of polymers and is resistant to detergents and disinfectants.

Boltaron® 4320 Material Properties And Specifications


  • Low shrinkage in thermoforming
  • Dimensional stability in use
  • Highest available impact strength of materials in its class
  • Meets UL 94 V-0
  • Widest range of colors and textures


  • Orthotic braces
  • Prostheses
  • Electrical enclosures in damage-prone, frigid areas

Performance details


  • FAR 25.853(a)(i) (Flammability) (Vertical burn, 60 sec) Pass
  • FAR 25.853(a)(ii) (Flammability) (Vertical burn, 12 sec) Pass


Name | Test Method | Imperial Metric

  • Specific Gravity ASTM D7921.35
  • Tensile Strength ASTM D6385,700 psi39.3 MPa
  • Flexural Strength ASTM D7908,700 psi60 MPa
  • Flexural Modulus ASTM D790308,000 psi2,125 MPa
  • Izod Impact Notched ASTM D25673°F 20.0 ft-lb/in23°C 1,068 J/m
  • Hardness Rockwell ASTM D785106
  • Heat Deflection Annealed ASTM D648167.5°F @ 264 PSI75.3°C @1.8 MPa
  • Flammability – ULUL 94@0.130 in. (3.3mm)94 V-0; 5 VA (1)
  • @ 0.130 in. (3.3mm) min. gauge UL 9494 V-0; 5 VA (1)
  • @ 0.040 in. (1.1mm) min. gauge UL 9494 V-0; 5 VB (2)
  • Forming Temperature335 – 385°F168 – 196°C
  • Heat Deflection (unannealed)ASTM D648167°F @ 264 psi75.3°C @ 1.8 MPa

* Independent lab tests. All tests at 73 °F (23 °C) in dry conditions unless otherwise noted.


  • Name Imperial Metric
  • Lengths120 in3,048 mm
  • Widths60 1,524 mm
  • Gauges from 0.028 to 0.250 in from .71 to 6.35 mm
  • Custom Sizes Blank sizes, gauges on request

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We specialize in the machining and fabrication of general-purpose and high-performance plastics for the aerospace, medical, food-processing, and general OEM companies.


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