GB8624-2006 "building materials and products of combustion performance classification for flame retardant plastic products has a strict plastic flame retardant grade, V - level 0 to the highest level, to two samples after 10 seconds of combustion test, flame extinguished within 30 seconds. There can be so drop down; The samples for level 1, V - 1 to 10 seconds twice after combustion test, flame extinguished in 60 seconds. There can be so drop down; V - 2 to 3, the samples twice after 10 seconds of combustion test, flame extinguished in 60 seconds. There can be so drop down; HB is the end of the flame retardant grade, requirements for 3 to 13 mm thick sample, burning speed is less than 40 mm per minute; Less than 3 mm thick sample, burning speed is less than 70 mm per minute; Or out in front of the sign of 100 mm. Commonly used testing equipment is horizontal vertical combustion performance tester.
GB/T2406 plastic oxygen index is used to test the plastic under the conditions stipulated in the sample in oxygen, nitrogen, the air mixture, minimum oxygen concentration, necessary to sustain the stable combustion in oxygen is expressed as a percentage of the volume, that is, plastic oxygen index. Generally OI (oxygen index) of 27 for the flame retardant performance or plastic, detection equipment is used in oxygen index apparatus.
GB2409 plastic vertical burning law is in plastic vertical state testing of the flame retardant performance, method of test equipment is used in the vertical flame retardant performance tester.
Burning temperature is needed to determine the burning temperature meter, burning temperature testing device are mainly ingot furnace and stainless steel container. Made from aluminium or copper ingot furnace, diameter of 100 mm, 100 mm high, and is equipped with a thermometer, temperature control element, and the container of jack. Ingot furnace is equipped with heating and constant temperature control system, can make the ingot furnace in constant any temperature between 150-500 degrees. Stainless steel container used for sample, the inner diameter 9 mm, high 48 mm, wall thickness 1 mm, cover the container with 10 mm long, inner diameter of 1.5 mm nozzle. Other for igniter, thermometer, stopwatch, balance, and grinder. Test procedure is to ingot preheating furnace to the set temperature and constant, then will be equipped with 1 g sample of the stainless steel container into a slot in the ingot furnace, at the same time of rapid cover start the stopwatch, (the lid on the ingot furnace top heating in advance), will be within 5 min igniter flame at 2 mm on the nozzle of the lid, such as at the start of the nozzle within 5 min without (or any) continuous 5 s flame, every time will ingot furnace temperature increase (or decrease) 10 degrees. Again with a new sample to test, so repeatedly, until the measure on the nozzle of consecutive 5 s above the minimum temperature of the flame, and the temperature record. In each predetermined temperature conditions three test, if there are two sample no more than 5 s continuous flame, will be elevated temperature 10 degrees to three sample, if appear two 5 s more, the lowest temperature to take it to a multiple of about 10, ignition temperature for the material.
Horizontal burning test need horizontal vertical combustion apparatus, the first from a source on the surface of the sample width of 25 mm and 100 mm each draw a line, then put in long axis horizontal specimen, the axis of the cross section and horizontal Angle of 45 degrees is fixed on the specimen holder. Put a water below 300 mm. Lit Bunsen burner, regulate the flame length of 25 mm and blue flame, the flame kernel with the tip of the application under the sample along the length of about 6 mm. Applying flame and start time, time for 30 seconds. In this period shall not move the Bunsen burner, but in the experiment, if less than 30 seconds time specimens have been burned to the first line, should immediately stop on fire, stop the flame should be done after the following observation records.
Hot rod test with hot rods method plastic combustion performance tester, the method for using a 8 mm diameter and temperature of 960 ℃ hot rod as a source, make its contact with the sample of end face 3 min, and then holding hot rods from the sample, at the beginning of the hot bar when in contact with the sample, observe and record the combustion behavior of specimen, and according to its combustion condition, to determine the combustion performance of sample. In the sample width from the ignition end of 25 mm and 100 mm, the article draw a line. The sample level fixed in the specimen holder. Heated to 950 ℃, a hot rod in the rotation bracket make hot rods in contact with the specimen, and start the timer. After 3 minutes with a hot rod specimen from the. Since start timing detailed observation specimens with or without visible flame in detail, such as the specimen is burning, record the flame front from the first line to the time needed for the second line, and the combustion rate calculated.
This is plastic several important testing requirements, through the detection requirements of plastic can rest assured to use in our daily life.
