Rating
| Concentration | 20 °C | 50 °C | Remark |
|---|---|---|---|
| aqueous | D* | – | |
| technical grade | – | – |
* estimated rating, given in the source without a temperature
Material comparison at 20 °C
Resistance overview
PMP is not resistant (D) to Hydrocyanic Acid (Hydrogen Cyanide) at aqueous and should not be used in direct contact. The chemical is expected to cause rapid degradation, which can include dissolution, cracking, severe swelling, or complete structural failure of the material.
Application context
Hydrocyanic Acid (Hydrogen Cyanide) is commonly encountered in laboratory work and chemical processing. PMP (Polymethylpentene (TPX)) is a thermoplastic typically used for tanks, piping, containers and liners. Since Hydrocyanic Acid (Hydrogen Cyanide) 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
PMP is not recommended for use with Hydrocyanic Acid (Hydrogen Cyanide). The D rating indicates that the material will suffer rapid and severe degradation, which may include cracking, dissolution, severe swelling, or complete structural failure. Using this combination risks equipment damage, leaks, and potential safety incidents. Consider using HDPE, LDPE, PP instead, which are rated A for this chemical and offer reliable long-term performance.
Did you know?
In industrial practice, PMP components exposed to Hydrocyanic Acid (Hydrogen Cyanide) are typically inspected for swelling, discoloration, or loss of mechanical strength as early indicators of chemical attack.
Materials rated A or B at 20 °C
Based on the row for aqueous, 20 °C.
- Thermoplastics
- HDPE A, PP A, PVC Rigid A, LDPE A, PVC Flexible A, Polystyrene A
- Fluoropolymers
- PTFE A, PVDF A, FEP A
- Elastomers
- EPDM A, Viton (FPM) A
- Metals
- SS 316 A, SS 304 A, Aluminium A
About PMP
Polymethylpentene (TPX) is a transparent polyolefin used for labware. It resists many acids and alkalis, while aromatic and chlorinated solvents and strong oxidisers attack 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.