Rating
| Concentration | 20 °C | 50 °C | Remark |
|---|---|---|---|
| 40 % | C | D | |
| technical grade | C | D |
Material comparison at 20 °C
Resistance overview
PP maintains a consistent rating of C 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. However, at 50 °C the resistance rating drops, indicating that temperature must be factored into the design. For heated applications, additional testing under actual service conditions is strongly recommended.
Application context
Acetaldehyde is commonly encountered in pharmaceutical manufacturing and coatings and paints. PP (Polypropylene) 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
PP has limited resistance to Acetaldehyde and should only be used for short-term or intermittent contact at ambient temperature. The C rating means the material undergoes noticeable changes — swelling, loss of strength, or surface degradation — that make it unsuitable for permanent installations. For prolonged or continuous exposure, FEP, PTFE, Aluminium offer significantly better resistance and are rated A.
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, Acetal (POM) B, PMP B
- Fluoropolymers
- PTFE A, FEP A, ECTFE/ETFE B
- Metals
- SS 316 A, SS 304 A, Aluminium A
About PP
Polypropylene resists most acids, alkalis and salt solutions. Concentrated oxidising acids, chlorinated solvents and aromatic hydrocarbons attack it, and it turns brittle below about 0 °C.
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.