At a glance
Based on the row for crystals, 20 °C.
- Rated A, very good resistance
- PTFE, HDPE, PP, PVDF, PVC Rigid, Viton (FPM), SS 316, SS 304, Aluminium, LDPE, FEP, ECTFE/ETFE, Nylon (PA), Acetal (POM), Polycarbonate, PVC Flexible, Polystyrene, PETG, PMP, SAN (20)
- Rated B, good resistance
- Polysulfone (1)
- Rated C, limited resistance
- EPDM, NBR (2)
- Rated D, not resistant
- none (0)
- No data in the source
- Silicone
- Rated lower at 50 °C than at 20 °C
- HDPE (A → C), PP (A → C), PVC Rigid (A → B), LDPE (A → C), Polycarbonate (A → B), Polystyrene (A → B)
Based on the row for crystals, 20 °C.
Rating profile by material family
Effect of temperature, 20 °C to 50 °C
Substance
- CAS number
- 57-11-4
- Formula
- C18H36O2
- Hazard symbols in the source
- Xi (irritant) (pre-GHS European symbols; check the current safety data sheet)
- Concentrations listed
- crystals
- Also listed as
- Octadecanoic acid
- Name in the source (German)
- Stearinsäure
Resistance table: Stearic Acid, crystals
| Material | 20 °C | 50 °C | Remark |
|---|---|---|---|
| Thermoplastics | |||
| HDPE | A | C | |
| LDPE | A | C | |
| PP | A | C | |
| PVC Rigid | A | B | |
| PVC Flexible | A | A | |
| PMP | A | A | |
| Polystyrene | A | B | |
| SAN | A | A | |
| Polycarbonate | A | B | |
| PETG | A | – | |
| Acetal (POM) | A | – | |
| Nylon (PA) | A | – | |
| Polysulfone | B | B | |
| Fluoropolymers | |||
| PTFE | A | A | |
| FEP | A | A | |
| PVDF | A | A | |
| ECTFE/ETFE | A | A | |
| Elastomers | |||
| EPDM | C | – | |
| Viton (FPM) | A | A | |
| NBR | C | C | |
| Metals | |||
| SS 316 | A | A | |
| SS 304 | A | A | |
| Aluminium | A | A | |
Not rated in the source, so not in the table: 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 Stearic Acid at high concentrations?
The materials with an A rating (resistant) for Stearic Acid at 20 °C are: PTFE, HDPE, PP, PVDF, PVC Rigid, Viton (FPM), SS 316, SS 304. These can generally be used in direct contact.
Does temperature affect chemical resistance to Stearic Acid?
Yes. 6 of 19 tested materials show a worse rating at 50 °C than at 20 °C for Stearic Acid. Materials affected include: HDPE, PP, PVC Rigid, LDPE, Polycarbonate, Polystyrene.
Is PTFE safe for Stearic Acid?
PTFE is rated A for Stearic Acid at 20 °C. A rating of A means resistant, B means limited resistance, C means partly resistant, and D means not resistant.
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.