Rating
| Concentration | 20 °C | 50 °C | Remark |
|---|---|---|---|
| 12,5 % Cl | C* | – | |
| 15 % | C* | – | |
| dilute | C | – | |
| saturated | C* | – |
* estimated rating, given in the source without a temperature
Material comparison at 20 °C
Resistance overview
PETG maintains a consistent rating of C across all 4 tested concentrations (12,5 % Cl, 15 %, dilute, saturated) of Sodium Hypochlorite (Bleach) 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
Sodium Hypochlorite (Bleach) is commonly encountered in bleaching and waste treatment. PETG (Polyethylene terephthalate glycol (co-polyester)) is a thermoplastic typically used for tanks, piping, containers and liners. Because Sodium Hypochlorite (Bleach) is classified as corrosive, the choice of containment material is especially critical to prevent leaks, equipment damage, and safety hazards.
Practical recommendation
PETG has limited resistance to Sodium Hypochlorite (Bleach) 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, PMP, Polystyrene, Polysulfone offer significantly better resistance and are rated A.
Did you know?
In industrial practice, PETG components exposed to Sodium Hypochlorite (Bleach) 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 15 %, 20 °C.
- Thermoplastics
- HDPE B, PP B, PVC Rigid A, LDPE B, Polycarbonate B, Polystyrene A, Polysulfone A, PMP A, SAN A
- Fluoropolymers
- PTFE A, FEP A, ECTFE/ETFE A
- Elastomers
- Viton (FPM) A
- Metals
- SS 316 B
About PETG
PETG is a co-polyester for clear containers. Strong acids and alkalis and most organic solvents 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.