Fireproof plastic materials are mainly used to produce high heat and high temperature electrical appliances, such as: printers, hot air ducts.Fire rating is achieved mainly by modifying resins or adding different materials.The additive materials are usually glass fiber, calcium carbonate, etc.According to different proportion and resin injection molding into a fire - resistant plastic materials.
The flammability UL94 class is the most widely used standard for the flammability of plastic materials.It is used to evaluate the ability of a material to be extinguished after being ignited.There are many ways to judge whether a droplet burns according to its burning speed, burning time, droplet resistance and whether it burns.Many values can be obtained for each material measured according to color or thickness.When material is selected for a product, its UL grade shall meet the thickness requirement of the wall part of the plastic part.The UL rating should be reported with the thickness value. It is not sufficient to report only the UL rating without the thickness.
The flame retardant grade of plastics increases gradually from HB, v-2, v-1, v-0, 5VB to 5VA:
HB: the lowest flame retardant rating in the UL94 standard.For samples 3 to 13 mm thick, combustion rate less than 40 mm/min;For samples less than 3mm thick, the combustion rate is less than 70mm/min;Or put it out before the 100mm mark.
V-2: after two 10-second combustion tests on the sample, the residual flame & residual flame will be extinguished within 60 seconds.The dripping particles can ignite the cotton.
V-1: after two 10-second combustion tests on the sample, the residual flame & residual flame will be extinguished within 60 seconds.The dripping particles must not ignite the cotton.
V-0: after two 10-second combustion tests on the sample, the residual flame & residual flame will be extinguished within 30 seconds.The dripping particles must not ignite the cotton.
5VB: flame & afterglow will be extinguished within 60 seconds after five 5-second combustion tests.The dripping particles must not ignite the cotton.The lumpy sample is allowed to burn through.
5VA: after five 5-second combustion tests on the sample, the residual flame & residual flame will be extinguished within 30 seconds.The dripping particles must not ignite the cotton.It is not allowed to burn through lumpy samples.
Because most of the plastic flame retardant is in the plastic molding when adding flame retardant, plastic flame retardant to pay attention to the product related laws and regulations requirements, most of the flame retardant contain more or less harmful ingredients!Therefore, when products have flame retardant requirements, when adding flame retardant production should also consider the corresponding laws and regulations requirements of the product.
What we used on our products, is V-0 fireproof material.