SU366397A1 - METHOD FOR DETERMINING THE COMBUSTIENCY OF FINISHING AND FACING MATERIALS - Google Patents

Description

one

The invention relates to methods for determining the flammability of finishing and veneering materials, varnishes, paints applied to various bases, as well as structural and insulating materials, and can be used in shipbuilding to enhance fire protection of ships.

The known methods allow to determine only a part of the parameters characterizing the flammability property of materials. The values of these Parameters do not give objective characteristics of the fire-hazardous properties of materials, which reduces the reliability of the methods, increases the error in the determination of results, does not allow obtaining the uniformity B of determining the properties of combustibility of the same materials.

The purpose of the invention is to obtain an unambiguous dependence between the flammability index and the ability of materials to burn.

This is achieved by the fact that, in order to determine the flammability of materials, different parts of the surface of the test samples are heated by different heat fluxes created by the ffr: red radiation burners. The density of heat fluxes in the sample varies uniformly from 40 cal / cm min to 16 cal / sl Xmin. The most heated area is set on fire by a constantly operating ignition flame.

20 mm high. At the same time, the following values are measured.

The heat installation coefficient / J, which characterizes the amount of heat, in kkile released during the combustion of the sample and necessary to raise the temperature of the combustion products by 1 ° C per minute; the maximum temperature of the combustion products is g max and the time it reaches Chuck per minute. Indicated values

determine the amount and rate of heat release during combustion.

The ignition time r, -, per minute, to determine the energy required to ignite the surface of the sample.

The travel time for the front of the flame of surface areas of equal length m, (, 2, 3, ..., 9), in sec., And the maximum distance / g, in MM, for which the flame has spread.

Using the measured values, the inflammability index is determined by the formula:

60./g

y 0

25

x (+ i + ... +.).

.

where (max -f °;

30 / o - temperature of gases before testing, ° С;

/ is the length of the test sample, mm; 0,495 - dimensional coefficient, min / kcal.

Materials and compositions of various materials are classified as follows: / 0 materials that do not spread flames over the surface; / 20-materials foul with the slow spread of flame over the surface; / 20-materials combustible with the rapid spread of flame over the surface.

Subject invention

The method for determining the flammability of finishing and cladding materials by using infrared radiation with measuring the ignition time, the flame front time of surface areas of equal length and the maximum temperature of the combustion products, characterized in that measure the distance of the flame, and the time to reach the maximum temperature of the combustion products

and based on the data obtained, the inflammability index is determined by the formula;

/ 1, 1.1, 4

V T-- g t- U

, 3M, jJ

where / 3 - thermal coefficient of the installation;

 max-time to reach the maximum temperature of the combustion products;

max max;

f max is the maximum temperature of the combustion products;

(o) initial temperature (before testing);

IB - B; Rem. Of ignition; / g - distance of nlameni;

/ is the sample length;

, 2,. -, 9 - time of passage by the flame front of surface areas of equal length.