Naturally Fire Resistant

With a high wool content Terra Lana natural wool insulation is a safe product to have in your home.

Sheep wool is naturally flame retardant because it has a high ignition temperature (570 -600 °C) and a high limiting oxygen index (25 -26% ). Wool contains high levels of nitrogen and sulphur so requires higher levels of oxygen in the surrounding atmosphere to accelerate combustion. The limiting concentration of oxygen required to support combustion of wool is higher than the ambient oxygen concentration in air (21%) which makes wool difficult to ignite.

Once ignited, the flame speads slowly and is easy to extinguish. This is because wool:

Has low heat of combustion and low heat release, meaning a slow fire spread rate
Has high nitrogen content (14%), therefore needs high levels of oxygen to keep burning
Has a relatively high moisture content
Does not melt or drip
Forms a self-insulating char that prevents further flame spread.

To summarise then, Terra Lana's wool insulation will burn if it comes into direct contact with a flame, but is unlikely to ignite through heat (exposed wires, downlights, chimney flues) or help a fire to spread. Another plus is Terra Lana insulation will not emit toxic gases in a fire.