---
title: "Vapor Smoothing Ultrasint PP Parts | AMT PostPro"
description: "PostPro vapor smoothing on BASF Ultrasint PP: roughness from 11.04 to 1.45 µm, more translucency, higher tensile strength and elongation."
canonical: https://amtechnologies.com/resources/whitepapers/postpro-vapor-smoothing-ultrasint-pp-parts-to-unlock-new-potentials/
updated: 2026-10-06
type: whitepaper
---
Whitepaper · Ultrasint PP

# Enhancing Ultrasint PP parts with vapor smoothing

Polypropylene is used across industries, and additive manufacturing needs effective post-processing to use it. This whitepaper applies PostPro chemical vapor smoothing to BASF Forward AM’s Ultrasint PP for powder bed fusion.

[Read the whitepaper (PDF, opens in a new tab)](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Whitepapers/AMT_WP_BASF%20SMOOTHING%20PP.pdf?ver=2) [Test your parts](https://amtechnologies.com/test-your-parts/)

Published Sep 24, 2022 Free download, no form

![Cover of the whitepaper “Enhancing Ultrasint PP parts with vapor smoothing”](https://amtechnologies.com/img/resources/wp-ultrasint-pp-720.webp)

- **With**: BASF Forward AM
- **Material**: Ultrasint PP
- **Printing**: Powder bed fusion
- **Published**: Sep 24, 2022

- 11.04 → 1.45 µm surface roughness, as printed → smoothed

Source: [BASF Forward AM whitepaper, amtechnologies.com](https://amtechnologies.com/resources/whitepapers/postpro-vapor-smoothing-ultrasint-pp-parts-to-unlock-new-potentials/) [PDF (opens in a new tab)](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Whitepapers/AMT_WP_BASF%20SMOOTHING%20PP.pdf?ver=2) published Sep 24, 2022

## The material

Ultrasint PP combines chemical resistance, durability and the familiar advantages of polypropylene, with good plasticity, toughness and low moisture absorption, a cost-effective alternative to PA12 for technical and functional parts.

## Results

- Surface roughness fell from 11.04 µm to 1.45 µm, close to conventional injection-molded parts
- Microscopy shows semi-sintered material and porosity removed
- Higher translucency and light transmittance
- Minimal dimensional change, within acceptable tolerance limits
- Tensile strength and elongation at break increased[PDF](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Whitepapers/AMT_WP_BASF%20SMOOTHING%20PP.pdf?ver=2)

Key finding

Surface roughness from 11.04 µm to 1.45 µm[PDF](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Whitepapers/AMT_WP_BASF%20SMOOTHING%20PP.pdf?ver=2)

Full whitepaper

Method, data and charts in the PDF. Free, no form to fill in.

[Download the PDF (opens in a new tab)](https://6983077.fs1.hubspotusercontent-na1.net/hubfs/6983077/Website/Whitepapers/AMT_WP_BASF%20SMOOTHING%20PP.pdf?ver=2)

Related

- [Compatible materials lists](https://amtechnologies.com/resources/documents/)
- [What is vapor smoothing?](https://amtechnologies.com/learn/what-is-vapor-smoothing/)
- [All whitepapers](https://amtechnologies.com/resources/whitepapers/)

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 weeks[1]

[Test your parts](https://amtechnologies.com/test-your-parts/) [See the systems](https://amtechnologies.com/products/vapor-smoothing/)

## Sources

1. [PostPro benchmarking: send us your 3D printed parts](https://benchmarking.amtechnologies.com/) · AMT · read Oct 6, 2026