With the development of technology and increasing environmental awareness, people are paying more attention to the environmental friendliness of products. RoHS (Restriction of Hazardous Substances) is a regulation issued by the European Union that aims to restrict the use of hazardous substances in electronics and electronic equipment to protect human health and the environment. RoHS testing refers to the testing of hazardous substances in products to ensure compliance with the restrictions of the RoHS regulation.

LISUN RoHS is a mandatory standard established by EU legislation. Its full name is “Restriction of Hazardous Substances” (Restriction of Hazardous Substances). This standard has been formally implemented since July 1, 2006 which is mainly used to regulate the materials and process standards of electrical and electronic products. And making it more conducive to human health and environmental protection. The purpose of this standard is to eliminate six items of lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers in electrical and electronic products, and stipulate that the content of lead should not exceed 0.1%. The new directive 2011/65/EU (RoHS 2.0) to replace the 2002/95/EC (RoHS) new directive will take effect on July 21, 2011. 

RoHS Testing Equipment EDX-2A

The objects of RoHS testing include various materials and components in electronics and electronic equipment. Common objects of testing include electronic circuit boards, cables and connectors, motors and switches, batteries and power supplies, etc. These materials and components may contain various hazardous substances such as lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBBs), and polybrominated diphenyl ethers (PBDEs). The purpose of RoHS testing is to ensure that the content of these hazardous substances does not exceed the limits specified by the regulation.

I. The methods of RoHS testing mainly include two types: X-ray fluorescence (XRF) and wet chemical analysis.

1. XRF is a non-destructive testing method that accurately detects the content of hazardous substances in samples by using specific X-rays. This method is simple and fast, suitable for rapid and large-scale testing needs. XRF instruments emit X-rays to the surface of the sample and determine the content of hazardous substances in the sample by measuring the energy of the reflected X-rays.

2. Wet chemical analysis is performed by dissolving the test sample and reacting it with specific chemical reagents, and then determining the content of hazardous substances by measuring the color concentration of the reaction products or performing blue-violet discoloration reactions. This method is relatively complex and requires a longer testing time, but it is more accurate and sensitive for certain specific hazardous substances.

II. The specific restrictions for various hazardous substances under the RoHS regulations are as follows

1. Lead (Pb): The limit is 0.1%. Lead is one of the most common hazardous substances in electronic products, harmful to the brain and nervous system, especially dangerous for children and pregnant women.
2. Mercury (Hg): The limit is 0.1%. Mercury is a heavy metal that has an impact on human health and the environment, especially on aquatic organisms. Common batteries and light bulbs may contain mercury.
3. Cadmium (Cd): The limit is 0.01%. Cadmium is a toxic metal that poses hazards to human health and the environment. Common batteries and electronic components may contain cadmium.
4. Hexavalent chromium (Cr6+): The limit is 0.1%. Hexavalent chromium is a carcinogenic substance that is harmful to human health. Hexavalent chromium is commonly used in corrosion-resistant materials.
5. Polybrominated biphenyls (PBBs): The limit is 0.1%. PBBs are organic pollutants that are harmful to human health and the environment.
6. Polybrominated diphenyl ethers (PBDEs): The limit is 0.1%. PBDEs are flame retardants commonly used in electronic products and plastics. However, they have potential hazards to human health and the environment.

III. Testing Standards for RoHS Testing

RoHS (Restriction of Hazardous Substances) is an EU directive aimed at limiting the content of harmful substances in products. RoHS testing involves the analysis of specific hazardous substances in electronic products to ensure compliance with relevant regulations.

The standards for RoHS testing include ISO 9001 quality management system, ISO 14001 environmental management system, and IECQ QC 080000 hazardous substance management system certification. These standards ensure that the products meet the relevant regulatory requirements during the production process and ensure protection of the environment and human health.
RoHS testing is typically conducted by third-party laboratories, which analyze the composition and perform chemical tests on the samples to determine whether the content of harmful substances in the products meets the requirements. The testing includes qualitative and quantitative analysis of the hazardous substances in the products to determine if their concentrations exceed the specified limits.

The results of RoHS testing will determine whether the product complies with the regulatory requirements based on the above limits. If the content of hazardous substances in the product exceeds the limits, the product will be deemed non-compliant with RoHS regulations. Electronic products sold in European Union countries must comply with RoHS regulations, otherwise they will face legal liability and market penalties.

IV. RoHS testing is of significant importance to product manufacturers and consumers

1. Firstly, through RoHS testing, companies can ensure that their products meet regulatory requirements, avoiding the risks of illegal production and sales. Secondly, RoHS testing can improve the reliability and quality of products by reducing the use of hazardous substances, which helps protect the health of users and the environment. In addition, RoHS testing can also enhance the reputation and competitiveness of companies, meet consumer demands for environmentally friendly products, and expand market share.
2. For consumers, purchasing products that have been tested for RoHS compliance is an important way to protect themselves and their families’ health. The use of hazardous substances can lead to chronic poisoning and other health issues, especially for children and pregnant women. Therefore, purchasing electronic products with RoHS certification can provide consumers with peace of mind.

In conclusion, the objects of RoHS testing include various materials and components in electronics and electronic equipment, and the methods of RoHS testing primarily involve X-ray fluorescence and wet chemical analysis. The RoHS regulations specify limits for the content of hazardous substances such as lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers. RoHS testing is of significant importance for companies to ensure compliance, protect user health and the environment, and enhance company reputation and competitiveness. For consumers, purchasing products that have passed RoHS testing ensures the environmental friendliness and safety of the products. Therefore, RoHS testing plays an important role in modern society and should receive more attention and emphasis.