Overview
EN ISO 14456:2024 (ISO 14456:2024) specifies a systematic method to classify gases and some pressurized liquids in cylinders using a four‑digit FTSC code. FTSC stands for Fire potential (oxidizing power and flammability), Toxicity (acute), State of the gas, and Corrosiveness. The standard provides a published list of FTSC codes and rules for assigning codes to single gases and mixtures, enabling assignment into 15 compatible gas groups for transport, storage and handling of gas cylinders. This edition (May 2024) supersedes EN ISO 14456:2016 and its 2019 amendment.
Key topics and technical requirements
- Four‑digit FTSC code: one digit for each category - F (fire potential/oxidizing power & flammability), T (acute toxicity), S (state of the gas in the cylinder at 15 °C), C (corrosiveness).
- Category breakdowns:
- F: subdivisions include inert, supports combustion, flammable, pyrophoric, oxidizing and chemically unstable.
- T: subdivisions for acute toxicity from supporting life to very toxic (based on LC50 values, see ISO 10298).
- S: covers liquefied, compressed, dissolved and various pressure classes (subdivisions 0–7; pressure thresholds reflect regional practices).
- C: corrosiveness categories addressing tissue damage/acid–base reactions.
- Assignment rules for single gases and mixtures, and tables of compatible groups to support safe grouping and segregation.
- Informative Annex A: examples and supporting chemical/hazard data for new FTSC entries.
- Aligns with relevant systems such as the GHS and references ISO standards for related gas properties.
Practical applications
- Use FTSC codes to classify gases for transport, storage, cylinder labeling and documentation.
- Support valve and outlet selection (interface considerations with ISO 5145) and risk assessments where mixing of gases could create ignition or oxidizing hazards.
- Enable gas suppliers, cylinder manufacturers and logistics providers to group compatible gases and define handling procedures.
- Assist regulators, emergency responders and safety officers with rapid hazard identification of pressurized gases.
Who should use this standard
- Gas cylinder manufacturers and refillers
- Gas suppliers and distributors
- Transport and logistics companies handling pressurized gases
- Standards committees, conformity assessors, and safety managers
- Emergency response planners and industrial hygienists
Related standards
EN ISO 14456:2024 is a practical reference for anyone classifying, handling or transporting pressurized gases - providing standardized FTSC codes to improve safety, interoperability and regulatory compliance.
