At a glance
Based on the row for aqueous, 20 °C.
- Rated A, very good resistance
- PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, Viton (FPM), SS 316, SS 304, LDPE, FEP, Nylon (PA), PVC Flexible (13)
- Rated B, good resistance
- none (0)
- Rated C, limited resistance
- NBR, Aluminium, Acetal (POM) (3)
- Rated D, not resistant
- Polycarbonate (1)
- No data in the source
- ECTFE/ETFE, Silicone, Polystyrene, Polysulfone, PETG, PMP, SAN
- Rated lower at 50 °C than at 20 °C
- PVDF (A → C), PVC Rigid (A → C), Aluminium (C → D), PVC Flexible (A → D)
- Rating changes with concentration (20 °C)
- PVC Flexible: A (aqueous), D (saturated)
Based on the row for aqueous, 20 °C.
Rating profile by material family
Effect of temperature, 20 °C to 50 °C
Substance
- CAS number
- 151-50-8
- Formula
- KCN
- Hazard symbols in the source
- T+ (very toxic) (pre-GHS European symbols; check the current safety data sheet)
- Concentrations listed
- aqueous; saturated
- Name in the source (German)
- Kaliumcyanid
Rating by concentration
Show as a table
| Material | aqueous | saturated |
|---|---|---|
| Thermoplastics | ||
| HDPE | A | A |
| LDPE | A | A |
| PP | A | A |
| PVC Rigid | A | A |
| PVC Flexible | A | D |
| PMP | – | – |
| Polystyrene | – | – |
| SAN | – | – |
| Polycarbonate | D | D |
| PETG | – | – |
| Acetal (POM) | C | C |
| Nylon (PA) | A | A |
| Polysulfone | – | – |
| Fluoropolymers | ||
| PTFE | A | A |
| FEP | A | A |
| PVDF | A | A |
| ECTFE/ETFE | – | – |
| Elastomers | ||
| EPDM | A | A |
| Viton (FPM) | A | A |
| NBR | C | C |
| Silicone | – | – |
| Metals | ||
| SS 316 | A | A |
| SS 304 | A | A |
| Aluminium | C | C |
Resistance table: Potassium Cyanide, aqueous
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | A | |
| LDPE | A | A | |
| PP | A | A | |
| PVC Rigid | A | C | |
| PVC Flexible | A | D | |
| Polycarbonate | D | D | |
| Acetal (POM) | C | – | |
| Nylon (PA) | A | – | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A | A | |
| PVDF | A | C | |
| Elastomers | |||
| EPDM | A | – | |
| Viton (FPM) | A | A | |
| NBR | C | C | |
| Metals | |||
| SS 316 | A | – | |
| SS 304 | A | – | |
| Aluminium | C | D | |
Not rated in the source, so not in the table: PMP, Polystyrene, SAN, PETG, Polysulfone, ECTFE/ETFE, Silicone
Resistance table: Potassium Cyanide, saturated
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | A | |
| LDPE | A | A | |
| PP | A | A | |
| PVC Rigid | A | C | |
| PVC Flexible | D | D | |
| Polycarbonate | D | D | |
| Acetal (POM) | C | – | |
| Nylon (PA) | A | – | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A | A | |
| PVDF | A | C | |
| Elastomers | |||
| EPDM | A | – | |
| Viton (FPM) | A | A | |
| NBR | C | C | |
| Metals | |||
| SS 316 | A | – | |
| SS 304 | A | – | |
| Aluminium | C | D | |
Not rated in the source, so not in the table: PMP, Polystyrene, SAN, PETG, 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 Cyanide at high concentrations?
The materials with an A rating (resistant) for Potassium Cyanide at 20 °C are: PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, Viton (FPM), SS 316. These can generally be used in direct contact.
Which materials should be avoided with Potassium Cyanide?
Materials rated D (not resistant) for Potassium Cyanide are: Polycarbonate. These should not be used in contact with Potassium Cyanide.
Does temperature affect chemical resistance to Potassium Cyanide?
Yes. 4 of 12 tested materials show a worse rating at 50 °C than at 20 °C for Potassium Cyanide. Materials affected include: PVDF, PVC Rigid, Aluminium, PVC Flexible.
Is PTFE safe for Potassium Cyanide?
PTFE is rated A for Potassium Cyanide 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 Cyanide?
Yes. Potassium Cyanide 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.