At a glance
Based on the row for dilute, 20 °C.
- Rated A, very good resistance
- PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, Viton (FPM), SS 316, SS 304, Aluminium, LDPE, FEP, ECTFE/ETFE, Nylon (PA), Polycarbonate, PVC Flexible, Polystyrene, Polysulfone, SAN (19)
- Rated B, good resistance
- PETG (1)
- Rated C, limited resistance
- NBR, Acetal (POM) (2)
- Rated D, not resistant
- none (0)
- No data in the source
- Silicone, PMP
- Rated lower at 50 °C than at 20 °C
- PVC Rigid (A → C), Acetal (POM) (C → D), PVC Flexible (A → C)
Based on the row for dilute, 20 °C.
Rating profile by material family
Effect of temperature, 20 °C to 50 °C
Substance
- CAS number
- 10043-67-1
- Formula
- KAl(SO4)2 x 12H2O
- Hazard symbols in the source
- Xi (irritant) (pre-GHS European symbols; check the current safety data sheet)
- Concentrations listed
- dilute; saturated
- Also listed as
- Alum; Potassium Alum
- Name in the source (German)
- Kaliumaluminiumsulfat
Rating by concentration
Show as a table
| Material | dilute | saturated |
|---|---|---|
| Thermoplastics | ||
| HDPE | A | A |
| LDPE | A | A |
| PP | A | A |
| PVC Rigid | A | A |
| PVC Flexible | A | A |
| PMP | – | – |
| Polystyrene | A | A |
| SAN | A | – |
| Polycarbonate | A | A |
| PETG | B* | B* |
| Acetal (POM) | C | C |
| Nylon (PA) | A | A |
| Polysulfone | A | A |
| Fluoropolymers | ||
| PTFE | A | A |
| FEP | A | A |
| PVDF | A | A |
| ECTFE/ETFE | A | A |
| Elastomers | ||
| EPDM | A | A |
| Viton (FPM) | A | A |
| 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: Alum (Potassium Aluminum Sulfate), dilute
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | A | |
| LDPE | A | A | |
| PP | A | A | |
| PVC Rigid | A | C | |
| PVC Flexible | A | C | |
| Polystyrene | A | A | |
| SAN | A | A | |
| Polycarbonate | A | – | |
| PETG | B* | – | |
| Acetal (POM) | C | D | |
| Nylon (PA) | A | – | |
| Polysulfone | A | – | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A | A | |
| PVDF | A | A | |
| ECTFE/ETFE | A | A | |
| Elastomers | |||
| EPDM | A | A | |
| Viton (FPM) | A | – | |
| NBR | C | C | |
| Metals | |||
| SS 316 | A | A | |
| SS 304 | A | A | |
| Aluminium | A | – | |
* estimated rating, given in the source without a temperature
Resistance table: Alum (Potassium Aluminum Sulfate), saturated
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | A | |
| LDPE | A | A | |
| PP | A | A | |
| PVC Rigid | A | C | |
| PVC Flexible | A | C | |
| Polystyrene | A | – | |
| Polycarbonate | A | – | |
| PETG | B* | – | |
| Acetal (POM) | C | D | |
| Nylon (PA) | A | – | |
| Polysulfone | A | – | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A | A | |
| PVDF | A | A | |
| ECTFE/ETFE | A | A | |
| Elastomers | |||
| EPDM | A | A | |
| Viton (FPM) | A | – | |
| NBR | C | C | |
| Metals | |||
| SS 316 | A* | – | |
| SS 304 | A* | – | |
| Aluminium | A | – | |
* estimated rating, given in the source without a temperature
Not rated in the source, so not in the table: PMP, SAN, 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 Alum (Potassium Aluminum Sulfate) at high concentrations?
The materials with an A rating (resistant) for Alum (Potassium Aluminum Sulfate) at 20 °C are: PTFE, HDPE, PP, PVDF, PVC Rigid, EPDM, Viton (FPM), SS 316. These can generally be used in direct contact.
Does temperature affect chemical resistance to Alum (Potassium Aluminum Sulfate)?
Yes. 3 of 16 tested materials show a worse rating at 50 °C than at 20 °C for Alum (Potassium Aluminum Sulfate). Materials affected include: PVC Rigid, Acetal (POM), PVC Flexible.
Is PTFE safe for Alum (Potassium Aluminum Sulfate)?
PTFE is rated A for Alum (Potassium Aluminum Sulfate) 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 Alum (Potassium Aluminum Sulfate)?
Yes. Alum (Potassium Aluminum Sulfate) is tested at 2 concentrations (dilute, 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.