This article presents results of fire retardants’ tests for wood. Analysis was conducted for two preparations, A1 containing guanidine carbonate and A2 with urea, in accordance with the standard ISO 5660-1 and nonstandard method using Mini Fire Tube. Samples of Scots pine (Pinus sylvestris L.) wood were protected using the above-mentioned mixtures applied under vacuum. Recorded results for pine wood impregnated with the tested preparations at a concentration of 15% show that they have high fire-retardant effectiveness at the intensity of the radiant heat of 35 kW/m2. An increase in the number of nitrogen atoms in the preparation provides greater fire-retardant effectiveness of the agent.
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