HEAT AND FLAME PROTECTION

EN ISO 11612 ABCDEF

> Supersedes EN 531

This standard specifies the performance requirements for garments that protect the body from heat and flame (except the hands).

There are 6 categories:
1. A 1 – A1 = Surface Ignition, B = Bottom Edge Ignition
2. B 1 – 3 Convective Heat
3. C 1 – 4 Radiant Heat
4. D 1 – 3 Molten Aluminium Splash
5. E 1 – 3 Molten Iron Splash
6. F 1 – 2 Contact Heat

Note that the lower the denominator, the poorer the performance.

In Detail:
European standard for garments that protect the user in the event of contact with hazardous heat and flames. The standard is relevant for industrial workers and electricians. If chemicals or flammable liquids are accidentally splashed on the garments, the wearer should immediately move away from the affected area and carefully remove the garments, ensuring that the chemicals or liquid do not come into contact with any part of the skin.

Design Demands:
20cm overlap jacket and trousers. Limited flame spread and heat resistance on internal pockets, linings, labels, badges, retro reflectives etc. Use an overall, two-piece jacket and trousers, or a jacket, bib and brace that are approved to this standard. Two-piece protective clothing must be worn together to provide the specified level of protection.
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Fabric Demands:
General requirement: mechanical strength and heat resistance at a temperature of 180°C: the material shall not ignite or melt and shall not shrink by more than 5%.

Code Letter A 1 – Surface Ignition, ISO 15025A
- No specimen shall give flaming to the top or either side edge
- No specimen shall give hole formation
- No specimen shall give flaming or molten debris
- The mean value of after flame time shall be ≤ 2 s
- The mean value of after glow time shall be ≤ 2 s

Code Letter A 2 – Edge Ignition, ISO 15025B
- No specimen shall give flaming to the top or either side edge
- No specimen shall give flaming or molten debris
- The mean value of after flame time shall be ≤ 2 s
- The mean value of after glow time shall be ≤ 2 s

Code Letter B – Convective Heat, ISO 9151
The garment’s protection against convective heat transfer is tested and approved under ISO 9151. Convective heat means the heat that passes through the garment on contact with flame. If there is an outer fabric that does not burn, injury may nevertheless be incurred due to the heat that forms when the fabric, and indirectly the body, comes into contact with the flame.

Code Letter C – Radiant Heat, ISO 6942
The garment’s protection against radiant heat transfer is tested under ISO 6942. Low heat radiation over a long period can result in a risk of injury. Therefore, the degree to which the garment lets heat through must be tested against radiant heat.

Code Letter E – Molten Iron Splash, ISO 9185
The protection provided by the fabric against molten metal splash is tested under ISO 9185. Even though the fabric does not burn and disintegrate when in contact with melted metal, burn injury to the wearer can nevertheless occur. This test gives an indication of how much metal splash the garment can take while still affording the wearer protection.

Code Letter F – Contact Heat, ISO 12127
The garment’s protection against contact heat transfer is tested under ISO 12127 at a temperature of 250˚C.

USER INFORMATION
Garments should always be worn as a complete set, consisting of a particular jacket and trousers/bib and brace in order to ensure maximum protection. In the event of accidental splashing with chemicals or flammable liquids, the wearer should immediately withdraw from the work area and carefully remove the garments, ensuring that the chemical or flammable liquid does not come into contact with the skin. The clothing must then be cleaned or taken out of use. In the event of a molten metal splash, the user must leave the work area immediately and remove the garments. Note that the garment may not eliminate all risk of burns if worn next to the skin.