Because of the way the wool fibre is structured, wool requires more oxygen than is available in the air to become flammable. Wool is accordingly an excellent fibre when it comes to fire safety. Furthermore, it does not melt, drip or stick to the skin when it burns. Wool's fire resistant attributes include:
• A very high ignition temperature – 570-600° C
• A high Limiting Oxygen Index (LOI). This is the measure of the amount of oxygen needed to sustain combustion
• A low heat of combustion – the measure of the amount of heat energy released in the burning process
• Does not melt or stick
Wool's inherent fire resistance comes from its naturally high nitrogen and water content. Because of these, wool requires higher levels of oxygen in the surrounding environment in order to burn. Wool may be ignited if subjected to a significantly powerful heat source, but does not normally support flame, and will instead smoulder – usually only for a short time. In addition, wool's cross-linked cell membrane structure will swell when heated to the point of combustion, forming an insulating layer that prevents the spread of flame. This also means that wool produces less smoke and toxic gas than synthetic fibres.
End Uses: Jackets, Over Trousers and Hoods
Fibre Blend: 100% Wool
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