Rating
| Concentration | 20 °C | 50 °C | Remark |
|---|---|---|---|
| 40 % | B | – | |
| technical grade | B | – |
Material comparison at 20 °C
Resistance overview
Acetal (POM) maintains a consistent rating of B across all 2 tested concentrations (40 %, technical grade) of Acetaldehyde at 20 °C. The fact that the rating does not change with concentration within the tested range simplifies material selection, though the boundary conditions beyond this range remain untested. The rating remains stable between 20 °C and 50 °C, which means this material can also handle moderately elevated process temperatures without additional risk.
Application context
Acetaldehyde is commonly encountered in coatings and paints and pharmaceutical manufacturing. Acetal (POM) (Polyoxymethylene (acetal)) is a thermoplastic typically used for tanks, piping, containers and liners. Since Acetaldehyde is flammable, material selection must also consider the risk of static charge buildup and the need for proper grounding in storage and transfer systems.
Practical recommendation
Acetal (POM) is suitable for use with Acetaldehyde under normal conditions, but some minor effects on the material are expected over time. Periodic monitoring for swelling, softening, or weight change is recommended, especially for long-service components. For safety-critical or long-life applications, consider FEP, PTFE, Aluminium instead, which are rated A for this chemical.
Did you know?
Temperature is often the deciding factor when selecting materials for Acetaldehyde: even materials rated A at 20 °C may lose performance at elevated temperatures.
Materials rated A or B at 20 °C
Based on the row for 40 %, 20 °C.
- Thermoplastics
- LDPE B, Nylon (PA) B, PMP B
- Fluoropolymers
- PTFE A, FEP A, ECTFE/ETFE B
- Metals
- SS 316 A, SS 304 A, Aluminium A
About Acetal (POM)
Acetal (POM) resists many organic solvents and fuels. Strong acids and oxidising agents degrade it.
Rating scale
- A very good resistance
- B good resistance
- C limited resistance
- D not resistant
- – no data
- K no general statement possible
A rating marked * is an estimate in the source, not a test result. An estimate is given as one value without a temperature.
About this data
The ratings come from the chemical resistance list published by Bürkle GmbH, which compiled them from raw-material manufacturers’ data. They describe laboratory tests on the raw material at 20 °C and 50 °C.
A finished part also sees pressure, mechanical stress, welds and mixtures that a laboratory test does not. Treat the rating as a first filter and test under your own conditions before relying on it.