How to know if the flame retardant material you use is environmentally friendly?

How to know if the flame retardant material you use is environmentally friendly?

In daily life, flame-retardant materials are used in various household appliances and are an important part of them. The property that makes the material possess or the material has the property of significantly delaying the spread of flame after treatment, which is the characteristic that defines the flame-retardant material. This plays a guiding role in the selection of materials used, 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 method, horizontal or vertical burning test method and so on. In general, adding flame retardants by physical methods can quickly be achieved. How to face this environmental protection problem? It was first noticed that electrical and electronic equipment contained heavy metals harmful to human health when the Netherlands discovered cadmium in a batch of cables for game consoles sold on the market in 2000. In fact, the solder used in large quantities in the production of electrical and electronic products and the ink printed on packaging boxes contain harmful heavy metals such as lead. As a result, various countries have issued environmental protection directives to restrict flame-retardant materials. Today's topic is the RoHS directive.

RoHS is a mandatory standard established by EU legislation. Its full name is "Restriction of Hazardous Substances" (Restriction of Hazardous Substances). The standard has been officially implemented on July 1, 2006, and is mainly used to standardize the material and process standards of electronic and electrical products, making it more conducive to human health and environmental protection. The purpose of this standard is to eliminate six substances including lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers in electrical and electronic products, and it specifically stipulates that the lead content cannot exceed 0.1%.

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

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

3. Cadmium (Cd

4. Hexavalent chromium (Cr 6+

5. Examples of polybrominated biphenyls (PBB) using this substance: flame retardants, PCBs, connectors, plastic shells

6. Examples of the use of polybrominated diphenyl ethers (PBDE): flame retardants, PCBs, connectors, plastic shells

The following is the upper limit of the concentration of six hazardous substances in RoHS:

Cadmium: less than 100ppm

Lead: less than 1000ppm

Less than 3500ppm in steel alloy

Less than 4000ppm in aluminum alloy

Less than 40000ppm in copper alloy

Mercury: less than 1000ppm

Hexavalent chromium: less than 1000ppm