The national standard for pc material (also known as polycarbonate) fire retardant belongs to the V-2 grade. pc material has UL94 V-2 flame retardant properties without additives. Enhanced pc material's UL temperature index reaches 120~140 ℃. v-2 grade standard for samples in two 10 seconds after the combustion test, the flame in 30 seconds to extinguish. It can ignite the medicinal cotton 30cm below.
V-2 flame retardant grade of the national standard:
1, no sample in the test after the flame is taken away, there are still embers burning for more than 30 seconds;
2, for each set of 5 samples, 10 times after the ignition of the fire with embers of the burning of the total **** time of not more than 250 seconds;
3, no sample has been burned all the way up to the fixture (including with the burning with embers and reddened burning);
4. The sample was allowed to burn melted droplets down to ignite the cotton 12" below, but the cotton burned for a shorter period of time;
5. There were no samples that continued to redden and burn for more than 60 seconds after the second removal of the test flame.
Expanded Information:
A. Characteristics of the PC material:
1, PC material has a flame-retardant, oxidation-resistant;
2, with a high-strength and Coefficient of elasticity, high impact strength, a wide range of operating temperatures;
3, a high degree of transparency and free dyeing;
4, low shrinkage rate of molding, good dimensional stability;
5, good fatigue resistance, good weather resistance;
6, excellent electrical characteristics;
7, tasteless and odorless harmless to the human body in line with health and safety;
8, the main performance defects of PC is that it is not a good material, but a good material. >8, PC's main performance defects are hydrolytic stability is not high enough, sensitive to the gap, resistance to organic chemicals, scratch resistance is poor, long-term exposure to ultraviolet light will be yellowing. Like other resins, PC is susceptible to the erosion of certain organic solvents.
Two, specific flame retardant grade introduction: plastic flame retardant grade by HB, V-2, V-1 to V-0 step by step.
1, HB: UL94 standard in the lowest flame retardant grade. Requirements for samples 3 to 13 millimeters thick, burning rate of less than 40 millimeters per minute; samples less than 3 millimeters thick, burning rate of less than 70 millimeters per minute; or extinguished before the 100-millimeter mark;
2, V-2: two 10-second combustion tests of the sample after the flame is extinguished within 30 seconds. Can ignite medicated cotton 30cm below;
3. V-1: Flame extinguished within 30 seconds after two 10-second burn tests on the sample. Cannot ignite the medicated cotton below 30cm;
4, V-0: After two 10-second combustion tests on the sample, the flame goes out within 10 seconds. There can be no burning material falling down.
Baidu Encyclopedia - Polycarbonate
Baidu Encyclopedia - Fire Rating UL94