For example, talk about fire-resistance rating. This figure means of protection is regulated by existing regulations. For steel it is characterized by the number of minutes from the start fire tests to reach a critical temperature (500 0 C) a standard sample of steel construction with flame retardant coating. In advertising, protective coatings can be read "refers to the means of Group 1 fire protection efficiency. " This means that the time to reach the critical temperature must be at least 150 minutes. For the second group the figure – at least 120 minutes and so on. In total there are 6 groups.
For timber introduce other measures of fire protection or impregnating composition. According to GOST 16363-76 (a careful reading of the instructions you will definitely see a link to it), there are only three groups of flame retardant efficiency. Group I – provides slow-wood (weight loss of the prototype during the combustion of certain conditions, the method is not more than 9%). Group II – provides inflammable wood (weight loss of 9 to 30%). Group III – funds do not provide the fire protection of timber (weight loss of more than 30%). Therefore, when buying a flame retardant, look at the number of fire-resistance rating. What he less, the composition better.
Sometimes it happens that the technology of applying the rules of composition and its flow rate depends on its effectiveness. Materials for tissue has its own standard, under which the test results flammable Textile materials are subdivided into flammable and inflammable. What is fire-retardant paint all flame retardants can be divided into impregnation, paints and varnishes. The word "treatment" rather eloquently. They are intended mainly to protect the wood and textile products, that is, for those materials that can infiltrate. If you try to briefly explain the "principle of the" impregnation we can say that certain temperatures in these compounds is substitution reaction with the absorption of energy, which inhibits burning.