At a glance
Based on the row for 50 %, 20 °C.
- Rated A, very good resistance
- PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, Viton (FPM), NBR, SS 316, SS 304, Aluminium, LDPE, FEP, ECTFE/ETFE, Nylon (PA), Acetal (POM), Polycarbonate, PVC Flexible, Polystyrene, Polysulfone, PETG, PMP, SAN (23)
- Rated B, good resistance
- none (0)
- Rated C, limited resistance
- none (0)
- Rated D, not resistant
- none (0)
- No data in the source
- Silicone
Based on the row for 50 %, 20 °C.
Rating profile by material family
Effect of temperature, 20 °C to 50 °C
No material with a rating at both temperatures changes grade between 20 °C and 50 °C.
Substance
- CAS number
- 7757-79-1
- Formula
- KNO3
- Hazard symbols in the source
- O (oxidising), Xn (harmful) (pre-GHS European symbols; check the current safety data sheet)
- Concentrations listed
- 50 %; aqueous
- Name in the source (German)
- Kaliumnitrat
Rating by concentration
Show as a table
| Material | 50 % | aqueous |
|---|---|---|
| Thermoplastics | ||
| HDPE | A | A |
| LDPE | A | A |
| PP | A | A |
| PVC Rigid | A | – |
| PVC Flexible | A | – |
| PMP | A | – |
| Polystyrene | A | – |
| SAN | A | – |
| Polycarbonate | A | A |
| PETG | A* | A* |
| Acetal (POM) | A | A |
| Nylon (PA) | A | A |
| Polysulfone | A | – |
| Fluoropolymers | ||
| PTFE | A | A |
| FEP | A | A |
| PVDF | A | A |
| ECTFE/ETFE | A | A |
| Elastomers | ||
| EPDM | A | A |
| Viton (FPM) | A | A |
| NBR | A | A |
| 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 Nitrate, 50 %
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | A | |
| LDPE | A | A | |
| PP | A | A | |
| PVC Rigid | A | A | |
| PVC Flexible | A | – | |
| PMP | A | – | |
| Polystyrene | A | A | |
| SAN | A | A | |
| Polycarbonate | A | – | |
| PETG | A* | – | |
| Acetal (POM) | A | A | |
| Nylon (PA) | A | – | |
| Polysulfone | A | – | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A | A | |
| PVDF | A | A | |
| ECTFE/ETFE | A | A | |
| Elastomers | |||
| EPDM | A | – | |
| Viton (FPM) | A | A | |
| NBR | A | A | |
| 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: Silicone
Resistance table: Potassium Nitrate, aqueous
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | A | |
| LDPE | A | A | |
| PP | A | A | |
| Polycarbonate | A | – | |
| PETG | A* | – | |
| Acetal (POM) | A | A | |
| Nylon (PA) | A | – | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A | A | |
| PVDF | A | A | |
| ECTFE/ETFE | A | A | |
| Elastomers | |||
| EPDM | A | – | |
| Viton (FPM) | A | A | |
| NBR | A | A | |
| 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: PVC Rigid, PVC Flexible, PMP, Polystyrene, SAN, Polysulfone, 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 Nitrate at high concentrations?
The materials with an A rating (resistant) for Potassium Nitrate at 20 °C are: PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, Viton (FPM), NBR. These can generally be used in direct contact.
Does temperature affect chemical resistance to Potassium Nitrate?
For Potassium Nitrate, all tested materials maintain the same rating at both 20 °C and 50 °C.
Is PTFE safe for Potassium Nitrate?
PTFE is rated A for Potassium Nitrate 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 Nitrate?
Yes. Potassium Nitrate is tested at 2 concentrations (50 %, aqueous). 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.