Shelf Life Reference
Shelf life from fill date for every Trigas USA calibration gas configuration. Use this chart to plan recalibration cycles and inventory rotation across your fleet. Store cylinders upright, dry and cool — improper storage can void the shelf life below.
Reactive mixtures
| Gas mixture | Formula | Shelf life (from fill date) |
|---|---|---|
| Benzene | C₆H₆ | 24 months |
| Ammonia | NH₃ | 12 months |
| Ethylene Oxide | C₂H₄O | 12 months |
| Hydrogen Cyanide | HCN | 12 months |
| Hydrogen Chloride | HCl | 6 months |
| Hydrogen Sulfide | H₂S | 24 months |
| Nitric Oxide | NO | 12 months |
| Nitrogen Dioxide | NO₂ | 12 months |
| Phosphine | PH₃ | 12 months |
| Sulfur Dioxide | SO₂ | 24 months |
| Chlorine | Cl₂ | 6 months |
| 4-Gas / Quad (H₂S, CO, LEL, O₂) | — | 24 months |
| H₂S / SO₂ mixture (reactive blend) | — | 24 months |
Non-reactive & pure gases
| Category | Shelf life (from fill date) |
|---|---|
| Non-reactive & 3-gas non-reactive mixtures | 48 months |
| Pure gases (Argon, Air, Nitrogen, Methane, Hydrogen) | 48 months |
Shelf life at a glance
- 24 months — H₂S & SO₂ (single or in mixtures), Benzene & 4-Gas/Quad mixes.
- 12 months — NH₃, NO, NO₂, PH₃, HCN & Ethylene Oxide.
- 6 months — highly reactive: HCl & Cl₂ only.
Reactive cylinder sizes: 34L · 58L · 108L · 116L. For recertification or configurations not listed, contact our team — most requests answered within 1 business day.
The shelf-life periods on this page are typical values from the fill date, provided as a planning reference for recalibration and inventory rotation. Actual shelf life can vary depending on the specific mixture, concentrations, and components, as well as storage conditions. Always defer to the Certificate of Analysis (CoA) for your cylinder — or contact us about a specific configuration.