Whitepaper · Evonik TPA (polyamide elastomer)

Evonik TPA: improving part properties with vapor smoothing

This study tests PostPro vapor smoothing on Evonik and HP’s co-branded TPA powder, a flexible polyamide elastomer, printed on an HP MJF 4200, for surface quality, mechanical properties and dimensional stability.

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Cover of the whitepaper “Evonik TPA: improving part properties with vapor smoothing”
With
Evonik
Material
Evonik TPA (polyamide elastomer)
Printing
HP Multi Jet Fusion 4200
Published

Source:Evonik whitepaper, amtechnologies.comPDF (opens in a new tab) published

The material

TPA is a flexible polyamide elastomer with low density, high extensibility, energy return and good processing characteristics. Its rebound resilience and elongation at break suit functional 3D-printed parts in automotive and equipment manufacturing.

The process

PostPro uses a patented physico-chemical process: controlled mobility and rearrangement of the top layer of surface material gives a sealed, smooth finish without compromising the part’s mechanical properties.

Key findings

  • Surface roughness significantly reduced
  • Mechanical properties such as tear strength and compression set improved
  • Minimal dimensional variation, so geometries and tolerances are kept
  • Better color retention and resistance to UV-induced degradation than untreated samplesPDF

Keep reading

All whitepapers

  • WhitepaperHP Multi Jet Fusion (5200 series)

    BASF Ultrasint TPU01

    Surface roughness 13.42 → 1.18 µmPDF

    With BASF Forward AM

  • WhitepaperHP Multi Jet Fusion 4200

    HP High Reusability PA12

    No loss in tensile strength; at most 0.4% dimensional changePDF

    With HP

Test your parts

Send us a part. See it smoothed.

We vapor smooth your own parts and send them back with the results. No cost to evaluate · Parts returned · Typical turnaround 2–3 weeks1

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