ISO 13338:2022 PDF

Overview

ISO 13338:2022 - "Gas cylinders - Gases and gas mixtures - Determination of corrosiveness for the selection of cylinder valve outlet" - defines how to determine the corrosiveness of pure gases and gas mixtures so that an appropriate cylinder valve outlet (connection) can be selected. It provides a complete corrosiveness listing for many pure gases and a calculation method for mixtures when experimental data are not available.

Key topics and technical requirements

• Classification scheme
  • Uses tissue corrosiveness categories: C (corrosive - irreversible damage), i (irritant - reversible damage), nc (non-corrosive/non-irritant).
  • Integrates with the FTSC code subdivisions for chemical reactivity: 0 (non‑corrosive), 1 (non‑halogen acid forming), 2 (basic), 3 (halogen acid forming).
• Table of pure gases
  • Table 1 lists corrosiveness and FTSC subdivisions for many pure gases and some liquids that may be supplied in pressure containers.
• Mixture assessment method
  • Adopts an additivity approach similar to the GHS method for eye/skin damage.
  • Uses generic concentration thresholds (Table 2) to classify mixtures:
    • Sum of C-components ≥ 3% → mixture classified as C
    • Sum of C-components ≥ 1% but