Rating
| Concentration | 20 °C | 50 °C | Remark |
|---|---|---|---|
| moist | A | A | |
| liquid | D | D |
Material comparison at 20 °C
Resistance overview
The resistance of PMP to Sulfur Dioxide is concentration-dependent. Across the 2 tested concentrations (moist, liquid), the 20 °C rating ranges from A at lower concentrations to D at higher ones. This means engineers must verify which concentration their process actually involves before relying on a single rating. 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
Sulfur Dioxide is commonly encountered in surface cleaning and laboratory work. PMP (Polymethylpentene (TPX)) is a thermoplastic typically used for tanks, piping, containers and liners. Because Sulfur Dioxide is classified as corrosive, the choice of containment material is especially critical to prevent leaks, equipment damage, and safety hazards.
Practical recommendation
PMP can be used with confidence for Sulfur Dioxide 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. This holds true at both 20 °C and 50 °C, giving a good safety margin for typical process environments.
Did you know?
In industrial practice, PMP components exposed to Sulfur Dioxide 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 moist, 20 °C.
- Thermoplastics
- HDPE A, PP A, PVC Rigid A, LDPE A, Polysulfone B
- Fluoropolymers
- PTFE A, PVDF A, FEP A, ECTFE/ETFE A
- Elastomers
- EPDM A
- Metals
- SS 316 A, SS 304 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.