The flame retardancy of plastics is an important index parameter in application. The flame retardant grade of plastics increases step by step from HB, V-2, V-1, V-0, 5VB_to 5VA. Some special engineering plastics, such as PPS, PPSU, PES, PEI and PEEK, have their own flame retardancy, while most common engineering plastics, such as polyamide, polyformaldehyde, linear polyester and polypropylene, need to be adding flame retardants to achieve high flame retardancy. Among them, halogen-free flame retardant is an important development trend. NFD is committed to the research and development of halogen-free flame retardant plastics and the application of special engineering plastics with self-extinguishing function, which can provide effective solutions to customers.

NFD can provide three types of flame retardant formulations: halogenated, halogen-free, and red phosphorus flame retardant engineering plastics. UL-94 -HB, V-2, V-1, V-0, 5VA are available. This depends on your needs!

For the physical properties of NFD commonly used flame retardant engineering plastics, please click: https://www.nfdpla.com/product/product.php?lang=en&class2=292

Three ways to improve the flame retardancy of plastics:

1. Grafting and crosslinking modification, adding sulfur, Si, B halogens in molecular chains, or adding crosslinking agents in polymers.

2. Adding flame retardant coatings, using non-combustible silicon carbide, ceramics, metals and other materials as coatings attached to plastics.

3. Adding flame retardant is the most widely used method at present.

Flame retardant mode:

1. The endothermic effect makes it difficult for the temperature of plastic materials to rise, such as magnesium hydroxide and aluminium hydroxide to dehydrate and absorb heat to produce flame retardant effect. Through inorganic materials with larger specific heat capacity, the thermal decomposition temperature is not easy to reach through heat storage and conduction.

2. covering effect, at higher temperature, the material is decomposed into foam material, covering the surface, blocking the heat into the interior, isolating the air to achieve the purpose of flame retardant. Porous carbon layer is formed on the surface, which is flame-retardant, heat-insulating, oxygen-insulating and can prevent combustible gas from entering the combustion gas phase, resulting in the interruption of combustion.

3. Release effect, the material is decomposed into a large number of inert gases or high-density vapors by heat. Around the material, oxygen concentration is too low, achieve the purpose of flame retardant. Nitrate, ammonium chloride and ammonium carbonate have this effect. Amines can be decomposed into NH3, H2O, and NO when heated. The first two gases can dilute the oxygen concentration in the flame zone, while the latter can quench the free radicals, resulting in the termination of chain reaction.

4. Transfer effect: change the thermal decomposition mode of materials, inhibit the production of flammable gases, use acid and alkali to dehydrate cellulose, decompose into carbon and water, do not produce flammable gases.

5. Inhibitory effect, inhibiting free radical chain reaction of polymer materials during combustion. Triphenylphosphates and triphenylphosphine oxides are cracked into free radical fragments in flame, trapping active intermediates of combustion reaction, such as HO., H., O., HOO, etc., to reduce combustion speed until extinction. P. is also formed in the combustion and pyrolysis of red phosphorus, which reacts with oxygen in the polymer to form phosphate structure.

6. Synergistic effect, such as the synergistic effect of antimony trioxide and halogen compounds, has better flame retardant effect.

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Socket, plug

Indoor appliances and kitchenware

Engine periphery

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