Compatibility Rating
Why is SS 304 resistant to Propionic Acid?
SS 304 shows excellent resistance to Propionic Acid due to its chromium content (18%) forming a passive oxide layer resistant to many corrosive environments.
⚠️ When NOT to use SS 304
Avoid using Stainless Steel 304 with chloride-rich environments (seawater, HCl) which cause pitting corrosion. Use 316 grade for chloride exposure.
Comparison Table — All Materials for Propionic Acid
| Material | 20°C | 50°C |
|---|---|---|
| HDPE | A | C |
| LDPE | A | C |
| PP | A | A |
| PTFE | A | A |
| PVDF | A | A |
| FEP | A | A |
| ECTFE/ETFE | NR | NR |
| EPDM | C | NR |
| Viton (FPM) | A | A |
| NBR | D | D |
| Silicone | NR | NR |
| SS 316 | A | A |
| SS 304 | A | A |
| Aluminium | A | A |
| PVC Rigid | A | C |
| PVC Flexible | C | C |
| PMP | NR | NR |
| Polystyrene | D | D |
| SAN | NR | NR |
| Polycarbonate | D | D |
| PETG | NR | NR |
| Acetal (POM) | D | D |
| Nylon (PA) | C | C |
| Polysulfone | D | D |
A=Excellent · B=Good · C=Fair · D=Poor · NR=No Data
🌡️ Temperature Note
Good resistance at both 20°C and 50°C. Maximum service temperature for this material is 800°C — above this, degradation risk increases significantly.
🔄 Better Alternative?
Consider: SS 316 for chloride environments. View all materials for Propionic Acid →
FAQ
Is Stainless Steel 304 resistant to Propionic Acid?
Stainless Steel 304 has Excellent (A) resistance to Propionic Acid at 20°C. Excellent resistance - recommended for continuous use.
Can I store Propionic Acid in Stainless Steel 304 containers?
Yes, Stainless Steel 304 is rated A (Excellent) for Propionic Acid.