Compatibility Rating
Why is SS 304 resistant to Sodium Hydroxide Caustic Soda?
SS 304 shows good resistance to Sodium Hydroxide Caustic Soda 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 Sodium Hydroxide Caustic Soda
| Material | 20°C | 50°C |
|---|---|---|
| HDPE | A | A |
| LDPE | A | A |
| PP | A | A |
| PTFE | A | A |
| PVDF | B | B |
| FEP | NR | NR |
| ECTFE/ETFE | NR | NR |
| EPDM | A | NR |
| Viton (FPM) | D | D |
| NBR | C | D |
| Silicone | NR | NR |
| SS 316 | B | B |
| SS 304 | B | B |
| Aluminium | D | D |
| PVC Rigid | NR | NR |
| PVC Flexible | NR | NR |
| PMP | NR | NR |
| Polystyrene | NR | NR |
| SAN | NR | NR |
| Polycarbonate | D | D |
| PETG | D | D |
| Acetal (POM) | C | C |
| Nylon (PA) | A | C |
| Polysulfone | NR | NR |
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 Sodium Hydroxide Caustic Soda →
FAQ
Is Stainless Steel 304 resistant to Sodium Hydroxide (Caustic Soda)?
Stainless Steel 304 has Good (B) resistance to Sodium Hydroxide (Caustic Soda) at 20°C. Good resistance - suitable for intermittent contact.
Can I store Sodium Hydroxide (Caustic Soda) in Stainless Steel 304 containers?
Yes, Stainless Steel 304 is rated B (Good) for Sodium Hydroxide (Caustic Soda) at room temperature.