At a glance
Based on the row for saturated, 20 °C.
- Rated A, very good resistance
- PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, SS 316, SS 304, Aluminium, LDPE, FEP, PVC Flexible, Polystyrene, PMP, SAN (15)
- Rated B, good resistance
- Viton (FPM) (1)
- Rated C, limited resistance
- NBR, Acetal (POM), Polycarbonate, PETG (4)
- Rated D, not resistant
- Nylon (PA) (1)
- No data in the source
- ECTFE/ETFE, Silicone, Polysulfone
- Rated lower at 50 °C than at 20 °C
- PVC Rigid (A → C), Polystyrene (A → C), SAN (A → C)
- Rating changes with concentration (20 °C)
- Nylon (PA): C (aqueous), D (saturated); Polycarbonate: A (aqueous), C (saturated)
Based on the row for saturated, 20 °C.
Rating profile by material family
Effect of temperature, 20 °C to 50 °C
Substance
- CAS number
- 7778-50-9
- Formula
- K2Cr2O7
- Hazard symbols in the source
- T (toxic) (pre-GHS European symbols; check the current safety data sheet)
- Concentrations listed
- aqueous; saturated
- Also listed as
- Potassium bichromate
- Name in the source (German)
- Kaliumdichromat
Rating by concentration
Show as a table
| Material | aqueous | saturated |
|---|---|---|
| Thermoplastics | ||
| HDPE | – | A |
| LDPE | – | A |
| PP | A | A |
| PVC Rigid | – | A |
| PVC Flexible | – | A |
| PMP | – | A |
| Polystyrene | – | A |
| SAN | – | A |
| Polycarbonate | A | C |
| PETG | C | C |
| Acetal (POM) | C | C |
| Nylon (PA) | C | D |
| Polysulfone | – | – |
| Fluoropolymers | ||
| PTFE | A | A |
| FEP | A* | A* |
| PVDF | A | A |
| ECTFE/ETFE | – | – |
| Elastomers | ||
| EPDM | A | A |
| Viton (FPM) | B | B |
| NBR | C | C |
| Silicone | – | – |
| Metals | ||
| SS 316 | A | A |
| SS 304 | A | A |
| Aluminium | A | A |
* estimated rating, given in the source without a temperature
Resistance table: Potassium Dichromate, aqueous
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| PP | A | A | |
| Polycarbonate | A | – | |
| PETG | C | – | |
| Acetal (POM) | C | – | |
| Nylon (PA) | C | – | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A* | – | |
| PVDF | A | A | |
| Elastomers | |||
| EPDM | A | – | |
| Viton (FPM) | B | – | |
| NBR | C | C | |
| Metals | |||
| SS 316 | A | A | |
| SS 304 | A | A | |
| Aluminium | A | A | |
* estimated rating, given in the source without a temperature
Not rated in the source, so not in the table: HDPE, LDPE, PVC Rigid, PVC Flexible, PMP, Polystyrene, SAN, Polysulfone, ECTFE/ETFE, Silicone
Resistance table: Potassium Dichromate, saturated
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | A | |
| LDPE | A | – | |
| PP | A | A | |
| PVC Rigid | A | C | |
| PVC Flexible | A | – | |
| PMP | A | – | |
| Polystyrene | A | C | |
| SAN | A | C | |
| Polycarbonate | C | – | |
| PETG | C | – | |
| Acetal (POM) | C | – | |
| Nylon (PA) | D | D | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A* | – | |
| PVDF | A | A | |
| Elastomers | |||
| EPDM | A | – | |
| Viton (FPM) | B | – | |
| NBR | C | C | |
| Metals | |||
| SS 316 | A | A | |
| SS 304 | A | A | |
| Aluminium | A | A | |
* estimated rating, given in the source without a temperature
Not rated in the source, so not in the table: Polysulfone, ECTFE/ETFE, Silicone
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.
Frequently Asked Questions
Which materials resist Potassium Dichromate at high concentrations?
The materials with an A rating (resistant) for Potassium Dichromate at 20 °C are: PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, SS 316, SS 304. These can generally be used in direct contact.
Which materials should be avoided with Potassium Dichromate?
Materials rated D (not resistant) for Potassium Dichromate are: Nylon (PA). These should not be used in contact with Potassium Dichromate.
Does temperature affect chemical resistance to Potassium Dichromate?
Yes. 3 of 12 tested materials show a worse rating at 50 °C than at 20 °C for Potassium Dichromate. Materials affected include: PVC Rigid, Polystyrene, SAN.
Is PTFE safe for Potassium Dichromate?
PTFE is rated A for Potassium Dichromate at 20 °C. A rating of A means resistant, B means limited resistance, C means partly resistant, and D means not resistant.
Does concentration affect chemical resistance to Potassium Dichromate?
Yes. Potassium Dichromate is tested at 2 concentrations (aqueous, saturated). Some materials change their rating depending on the concentration.
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.
Chemicals with a similar resistance profile
Same 20 °C rating on the share of materials shown.