Overview
Nitrogen purity (N₂ Purity (%)) is the proportion of nitrogen in the gas mix. The remaining fraction is oxygen, expressed as a percentage (%) or in parts per million (PPM) for high-purity applications.
Formulas:
O₂ % = 100 − N₂ % O₂ PPM = O₂ % × 10,000
Conversion Table
| N₂ Purity (%) | O₂ (%) | O₂ (PPM) |
|---|---|---|
| 95.000 | 5.000 | 50,000 |
| 96.000 | 4.000 | 40,000 |
| 97.000 | 3.000 | 30,000 |
| 98.000 | 2.000 | 20,000 |
| 99.000 | 1.000 | 10,000 |
| 99.500 | 0.500 | 5,000 |
| 99.750 | 0.250 | 2,500 |
| 99.900 | 0.100 | 1,000 |
| 99.950 | 0.050 | 500 |
| 99.980 | 0.020 | 200 |
| 99.990 | 0.010 | 100 |
| 99.995 | 0.005 | 50 |
| 99.999 | 0.001 | 10 |
Quick Reference
- Ultra-high purity (≥99.99% N₂ or ≤100 PPM O₂) — laser cutting, electronics manufacturing, pharma packaging.
- High purity (99–99.9% N₂ or 1,000–10,000 PPM O₂) — chemical blanketing, metal processing.
- Medium purity (95–99% N₂ or 10,000–50,000 PPM O₂) — food packaging, fire prevention systems.