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How to know if the flame retardant materials you use are environmentally friendly

In daily life, flame retardant materials are hidden in all kinds of household appliances and are an important part of them. The property of a substance or material treated to significantly delay the spread of flame, which is the characteristic that defines a flame retardant material. This plays a guiding role in the selection of materials, especially materials used in building materials, ships, vehicles, and home appliances have special requirements for flame retardancy.

At present, there are many methods for evaluating flame retardancy, such as oxygen index measurement, horizontal or vertical combustion test method, etc. Usually, the physical method to add flame retardants, this method is low cost, quickly can be achieved, but easy to cause negative effects on the environment and the human body, how to face this environmental problem? The first note that electrical and electronic equipment contains heavy metals harmful to human health is the Netherlands in 2000 in a number of market sales of the game machine cable cadmium found. In fact, electrical and electronic products in the production of a large number of solder, packaging box printing ink contains lead and other harmful heavy metals. As a result, countries have issued environmental protection directives to restrict flame retardant materials, and today's theme is the RoHS directive.

RoHS is a mandatory standard formulated by EU legislation. Its full name is "Directive on Restricting the Use of Certain Hazardous Components in Electrical and Electronic Equipment" (Restriction of Hazardous Substances). The standard has been formally implemented on July 1, 2006. It is mainly used to standardize the material and process standards of electronic and electrical products to make it more conducive to human health and environmental protection. The purpose of the standard is to eliminate lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers in electrical and electronic products (note: the correct Chinese name of PBDE refers to polybrominated diphenyl ethers, and polybrominated diphenyl ethers are wrong) a total of 6 substances, and focuses on the requirement that the content of lead should not exceed 0.1 per cent.

1. Lead (Pb) Examples of use of the substance: solder, glass, PVC stabilizer

2. Mercury (Hg)(mercury) Examples of use of this substance: thermostats, sensors, switches and relays, light bulbs

3. Cadmium (Cd

4. Hexavalent chromium (Cr 6

5. Polybrominated biphenyls (PBB) Examples of the use of this substance: flame retardants, PCBs, connectors, plastic housings

6. Polybrominated diphenyl ethers (PBDEs) Examples of use of the substance: flame retardants, PCBs, connectors, plastic housings

The following are the upper concentrations of the six pests specified in RoHS:

Cadmium: less than 100ppm

Lead: less than 1000ppm

less than 3500ppm in steel alloy

Aluminum alloy less than 4000ppm

Copper alloy less than 40000ppm