Rating
| Concentration | 20 °C | 50 °C | Remark |
|---|---|---|---|
| technical grade | D | D | |
| concentration not stated | D | D |
Material comparison at 20 °C
Resistance overview
PP maintains a consistent rating of D across all 2 tested concentrations (technical grade) of Dichlorodifluoromethane (R-12) 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
Dichlorodifluoromethane (R-12) is commonly encountered in chemical processing and water disinfection. PP (Polypropylene) is a thermoplastic typically used for tanks, piping, containers and liners. The compatibility between these two is therefore an important consideration for engineers and procurement teams selecting containment, transfer, or processing equipment.
Practical recommendation
PP is not recommended for use with Dichlorodifluoromethane (R-12). 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 Nylon (PA), Acetal (POM), Polysulfone instead, which are rated A for this chemical and offer reliable long-term performance.
Did you know?
When choosing between thermoplastics for Dichlorodifluoromethane (R-12) service, engineers consider not just the resistance rating but also factors such as permeation rate, creep resistance, and weldability.
Materials rated A or B at 20 °C
Based on the row for technical grade, 20 °C.
- Thermoplastics
- PVC Rigid B, Nylon (PA) A, Acetal (POM) A, Polysulfone A
- Fluoropolymers
- PTFE 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.