the oxygen index test -j9九游会登录入口

the oxygen index test

definition:

oxygen index (oi) refers to the provisions of the conditions, the material in the oxygen and nitrogen mixture flow to meet the need of flaming minimum oxygen concentration. with oxygen volume percentage of the value. high oxygen index said material is not easy to burn, low oxygen index said material easy to burn.

purposes:

is plastic and other polymer relative combustibility evaluation of a method of said materials judged whether when in contact with the flame burning in the air is very effective to the difficulty of the, thus brought to the attention of the countries all over the world.

test method:

to fix a specimen vertically upwards flow of oxygen, nitrogen gas mixture of transparent glass burning in the cylinder, lit up the top of the specimen, and observe the combustion characteristic of sample, the test continuous time or sample combustion intensity compared with the given criterion, through a series of experiments under different oxygen concentration, estimate the minimum value of oxygen concentration. minimum oxygen index value are compared, in order to test the three samples, according to the criterion of judging a minimum of two test samples.

test standard:

gb/t 2406.2-2009 plastics. determination of burning behaveiour by oxygen index. part 2:ambient-temperature test

astm d2863-08 standard test method for measuring the minimum oxygen concentration to support candle-like combustion of plastics (oxygen index)

iso 4589-2:1996 plastics-determination of burning behaviour by oxygen index part 2:ambient-temperature test supersedes

sample size：

remark: only when the test samples with the same specifications, test results between different materials can only be compared with each other.

test schematic diagram