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Plastic flame retardant grade, the higher the better?

by:Xingfa      2020-10-18
In general, people have always wanted to plastic material flame retardant level higher. But the engineer told us: different USES have different requirements for flame retardant.



in the flame retardant industry plastic tile flame retardant grade UL94 standard of the communist party of China is divided into 12: HB, V - 0,V - 1、V - 2、5 va, 5 vb, VTM - 0、VTM- 1,VTM - 2、住宅、HF - 1,高频, 2.



combustible UL94 rating is very widely used in plastic material inflammable performance standards. It is used to evaluate the ability of a material after being lit out. According to the combustion rate, burning time, resistance ability and drops bead is burning can have many kinds of evaluation method. Each material to be tested according to the color or thickness can be many values. Elected a product materials, their level of UL should meet the requirements of part of the plastic parts wall thickness. UL level should be reported with the thickness value, only UL report level without thickness is not enough.





the following details of individual plastic flame retardant grade:



HB: UL94 standard among the lowest in the flame retardant grade. Request for samples of 3 to 13 mm thick, 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.



V- 2: for the first of two of the sample after 10 seconds of combustion test, residual flame & amp; Burning out in 60 seconds. Drip particles can light cotton.



V- 1: two of the sample after 10 seconds of combustion test, residual flame & amp; Burning out in 60 seconds. Drip particles of light cotton.



V- 0: two of the sample after 10 seconds of combustion test, residual flame & amp; Burning out within 30 seconds. Drip particles of light cotton.



5 vb: five times the samples after 5 seconds of combustion test, residual flame & amp; Burning out in 60 seconds. Drip particles of light cotton. For the block sample permitted to burn.



5 va: five times the samples after 5 seconds of combustion test, residual flame & amp; Burning out within 30 seconds. Drip particles of light cotton. For block sample is not permitted to burn.



now there are many types of flame retardant test method, and various kinds of flame retardant test method has its limitations, its conclusions are relative. So is not flame retardant level is higher, the better, usually think UL94V - for example Material than V - level 0 Level 2 is good. However, some electrical appliances product requirements material has an arc of ignition, the V - Level 2 V - Level 0. Because 94 v - Level 2 plastic won't form under the action of electric conduction and coking, thus greatly reduce the possibility of a fire, and v - 94 Level 0 plastic, on the other hand.
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