Tianjie's attitude towards products: Flame retardant chapter

What is flame retardant for cables?

  Flame retardant cable (English name: flame retardant cable)definition: in the cable sheath flame combustion, only a limited distance andcan be self-extinguishing.

  Specifically for the description of flame-retardant cables, refers tothe specified test conditions, the specimen is burned, after the withdrawal of the test fire source, the spread of the flame is only within a limited range,the residual flame or residual burns in a limited period of time can be extinguished by the cable. The fundamental characteristic is the possibility of being burned in a fire situation and can not run, but can prevent the spread offire. In layman's terms, the wire in case of fire, can limit the combustion inthe local range, does not produce the spread, to save other kinds of equipment,to avoid causing greater losses.

  Each country has corresponding regulations for the flame retardant standards for cables, from household to commercial have different flame retardant level requirements. UL standards, for example, from the domesticlevel of flame retardant standards UL1581 CMX single vertical combustion and CMG general-purpose level of flame retardant requirements to UL 1685 CM commercial grade bundles of vertical combustion and higher trunking grade UL1666 CMR bundles of vertical combustion, as well as the highest level of flame retardant requirements of the UL 910 CMP Stainer duct boosting level of combustion test.Flame retardant test methods for wire and cable in a variety of uses. From single to bundled, from ordinary flame to pressurised duct, simulating the actual burning of wire and cable in the use scenario when fire occurs. The poorer the flame retardant properties, the more likely the cable will burn oreven become the fuse for the fire to spread, which means the lower the safetyfactor of the wire and cable.

How to achieve flame retardancy in cables?

  The flame retardant properties of wires and cables will be involved inthe safety of electrical appliances, equipment and even buildings, especially in extreme cases, when a fire occurs the safety performance of wires and cables may be able to give people to escape and win more rescue time. Then how to achieve the flame retardant cable?

  First of all, of course, the choice is made from the material, and different flame retardant grades have different requirements for the material.The good or bad flame retardancy of the reaction material is expressed by the oxygen index, which refers to the lowest oxygen concentration required for flaming combustion of the material in the oxygen-nitrogen mixed gas stream under the specified conditions, expressed as the value of the volume percentage occupied by oxygen. The greater the oxygen index, the less likely the material will burn, and vice versa. Along with the higher requirements for flame retardancy there are additional requirements, such as smoke density after burningand the dripping of combustion residues, which are more demanding for the material at this time. Therefore, the correct material should be selected at the beginning of the design process for cables with different flame retardancylevels. The design principle is to achieve the performance requirements of the product with the best cost performance.

  Secondly, we also need to do articles from the cable process and structure, choose the right material is not everything is fine, we should know that the structure of the cable is the key to achieve the ultimate performance.We understand that the conditions of combustion is the material to reachignition point plus the presence of combustion-assisting substances in order toul timately achieve material combustion, then in the cable structure, can changeis to minimise or block the presence of combustion-assisting substances (air),so from the structure of how to cable is more compact to reduce the presence ofvoids, generally take the extrusion of the production process; stranded to takea regular arrangement; the use of flame-retardant materials to fill the gaps;use of metal foil wrapping or braided shielding and so on, to avoid loose cable. Metal foil wrapped or braided shielding, etc., to avoid the cable loose internal storage of a large number of voids to reduce the flame retardant properties.

Of course, after the completion of the first design and manufacture off lame-retardant cables should be in accordance with the standard requirements of the test conditions for flame retardant test, only through the corresponding conditions of the test can be marked that the cable is in line with the flame retardant safety standards.

About Tianjie's Products

  Tianjie insists on winning the market with high-quality products. All exported products meet the flame retardant standard certification of UL andETL, and we will complete the certification of the highest flame retardant Pgrade products in 2021, and now we have completed the full coverage from the low grade to the high grade in order to adapt to the customer's requirementsfor the different grades of flame retardant of the products. The company cooperates with the 23rd Institute of Cable Research to set up its own combustion laboratory to escort the development of flame retardant material sand flame retardant cables.

  The cable products with very low quality requirements are the quagmireof low-priced vicious competition. Tianjie has been aiming at products andservices for high-end customers, and with the market becoming more and more standardised in terms of product requirements, we believe that we can gofurther and further.