Rating
| Concentration | 20 °C | 50 °C | Remark |
|---|---|---|---|
| 5 % | A | B | |
| 30 % | A | B | |
| concentration not stated | A | B |
Material comparison at 20 °C
Resistance overview
Acetal (POM) shows excellent resistance to Ammonium Hydroxide (Ammonia Solution) across all 3 tested concentrations (5 %, 30 %) at 20 °C, making it a reliable choice for storage, transfer, and handling applications involving this chemical at any of the tested strengths. 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
Ammonium Hydroxide (Ammonia Solution) is commonly encountered in chemical processing and cleaning and sanitation. Acetal (POM) (Polyoxymethylene (acetal)) is a thermoplastic typically used for tanks, piping, containers and liners. Because Ammonium Hydroxide (Ammonia Solution) is classified as corrosive, the choice of containment material is especially critical to prevent leaks, equipment damage, and safety hazards.
Practical recommendation
Acetal (POM) can be used with confidence for Ammonium Hydroxide (Ammonia Solution) containment and handling. The A rating indicates that the material shows no significant change in weight, dimensions, or mechanical properties after prolonged contact under test conditions. At elevated temperatures (50 °C), some reduction in resistance occurs, so periodic inspection is advisable for heated applications. Always verify performance under actual operating conditions before committing to a design.
Did you know?
Temperature is often the deciding factor when selecting materials for Ammonium Hydroxide (Ammonia Solution): 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 30 %, 20 °C.
- Thermoplastics
- HDPE A, PP A, PVC Rigid A, LDPE A, Polystyrene B, Polysulfone B, PETG B, PMP A
- Fluoropolymers
- PTFE A, PVDF B, FEP A, ECTFE/ETFE A
- Elastomers
- EPDM A, NBR 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.