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Technical Datasheet | Supplied by Evonik
VESTAKEEP® i4 3DF by Evonik is an unfilled, high viscosity, biocompatible polyether ether ketone (PEEK) grade. Exhibits extra high purity and extended quality measures. It is suitable for processing by 3D printing, fused deposition molding and extrusion.
  • It offers good abrasion-, acid-, alkali-, grease- and hydrolysis resistance.
  • It is hydrolytically stable grade and also offers good oil-, solvent-, wear- and heat resistance.
  • It complies with ASTM F2026 regulations for surgical implant applications.
  • VESTAKEEP® i4 3DF is recommended for long term implantable medical devices.
Product Type
PK (Polyketone) > PEEK
Physical Form

VESTAKEEP® i4 3DF Properties

Thermal Properties

Value & Unit
Test Condition
Test Method
Deflection Temperature at 1.8 MPa (264 psi)
150 °C
(Method A) 
ISO 75-1
Melting Point
338 °C
ISO 11357
Deflection Temperature at 0.46 MPa (66 psi)
205 °C
(Method B) 
ISO 75-2

VESTAKEEP® i4 3DF Processing Guidelines

Extrusion Properties

Value & Unit
Test Condition
Test Method
Drying Temperature
< 140 °C
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