Burning rate test

The flammability of solid substances is determined by burning rate tests [10,134,135]. From a mold, a pile of the substance under investigation is placed on a noncombustible, nonporous, and low heat-conducting base plate. One end of the pile is ignited by a hot gas flame or a hot platinum wire (temperatures above 1000°C). The burning rate is established and measured. 

Burning-Rate Tests of Pyrotechnic Mixtures Containing in Situ Polymerized Fuel yrup a... 

Under given conditions, ignite a sample and measure the time required for the sample to completely bum off (U.N. burning rate test/the burning rate test in the Japanese Fire Services Law). 

Measure the time required for a sample of 10 cm to completely bum off (burning rate test proposed in U. K.). 

The 30g mixture burning test has been adopted by the United Nations 4 01 based on oxidizing burning rate tests(the 5 pound test) 3 used in America. Uehara 41 and Hasegawa 4 21 have concluded that this method should be adopted for the Fire Services Law in Japan. The experimental data supporting their conclusion are archived at the Hazardes Material Laboratory of Japan Carlit Co., Ltd. 

The 30g burning test is the method of choice for measuring the intensity od bumiong of mixtures of powdey oxidizers and combustible materials, but this method cannot be applied to solid oxidizers that have been molded into larger shapes. The 5 lb(2, 270 g) burning rate test has been proposed in the USA, but this test is on too large a scale for use in the size of apparatus available in the Japanese laboratory hence, we did not adopt this method. 

The 500 g burning rate test of a mixture of standard crystalline potassium perchlorate and large—size particle of sawdust. 

The 500g burning rate test for a mixture of standard solid oxidizer and large-sized particles of sawdust... 

Up to now, the common assessment method of the hazards of solid oxidizers is merely burning rate tests of mixtures of oxidizers and wood powder or cellulose. For the burning rate tests of combustible solid particles, the following methods are used the IMO method (proposed by UK), the Rutubo method, the TNO methed, the US method, the US Transport Ministry method, the US Bureau of Mines method, the UK time/pressure test, and the modified time/pressure test. We have studied the IMO method, the TNO method and the modified time/pressure test. Bum hazards were described in the first book 1) and in Section 3.5 of this book. 

For self-propagation, the IMO burning rate test(p,121 in book M ) is suitable. In addition, the dust explosion test (p.223 in book 1"1 ) is recommended when combustible dusts are evaluated. 

Burning rate test Substances or mixtures other than metal powders (a) wetted zone does not stop fire and (b) burning time < 45 s or burning rate > 2.2 mm/s Metal powders burning time < 5 min. 

To classify a flammable solid, the test method N.l as described in Part III, sub-section 33.2.1 of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria should be performed. The procedure consists of two tests a preliminary screening test and a burning rate test. Classification is according to the following decision tree ... 

Burning rate test Substances and mixtures other than metal powders wetted zone stops the fire for at least 4 minutes and burning time < 45 seconds or burning rate >2.2 mm/second Metal powders burning time > 5 minutes and <10 minutes. Symbol ... 

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