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The EU RoHS Directive (Restriction of the Use of Certain Hazardous Substances) requires the restriction of the use of heavy metals such as lead, mercury, cadmium, hexavalent chromium, and certain brominated flame retardants in electronic and electrical equipment. For PVC insulation compounds, lead-free is one of the key requirements to meet the RoHS Directive. The following are specific methods and strategies to achieve lead-free PVC insulation compounds:
ML-J9001 90℃ Halogen-Free Low Smoke Flame Retardant Insulation Compound
1. Select lead-free heat stabilizers
PVC requires heat stabilizers during processing and use to prevent material decomposition and degradation. Although traditional lead salt stabilizers (such as tribasic lead sulfate, dibasic lead phosphite, etc.) are effective, they contain a large amount of lead and do not meet the requirements of the RoHS Directive. Alternatives include:
Calcium zinc composite stabilizer: This is the most commonly used lead-free stabilizer with good thermal stability and transparency. By optimizing the ratio and formulation of calcium and zinc, an effect similar to that of lead salt stabilizers can be achieved.
Organotin stabilizer: Organotin stabilizers (such as dibutyltin maleate, di-n-butyltin laurate, etc.) are highly efficient and low toxic, and are ideal for high-performance PVC insulation compounds, but they are expensive.
Rare earth stabilizers: Composite stabilizers of rare earth elements (such as lanthanum and cerium) have good thermal stability and processing performance, and do not contain heavy metals, and are emerging lead-free stabilizer options.
2. Optimize formula design
In addition to replacing the heat stabilizer, the entire formula needs to be optimized to ensure that the performance of the material is not affected:
Plasticizer selection: Use environmentally friendly plasticizers such as epoxy soybean oil, citrate, dioctyl terephthalate (DOTP), etc. These plasticizers are not only free of heavy metals, but also have good biodegradability and environmental protection.
Filler selection: Use heavy metal-free fillers such as calcium carbonate, talc, kaolin, etc. These natural mineral fillers can not only reduce costs, but also improve the mechanical properties of the material.
Flame retardant selection: If flame retardant properties are required, halogen-free flame retardants (such as red phosphorus, intumescent flame retardants) or low-smoke halogen-free flame retardants should be selected, and flame retardants containing heavy metals should be avoided.
3. Strict quality control
During the production process, strict quality control is the key to ensure that PVC insulation compounds comply with the RoHS directive:
Raw material testing: All raw materials are tested for heavy metal content to ensure that they meet environmental protection standards.
Production process monitoring: During the production process, temperature, time and ingredient ratio are strictly controlled to avoid heavy metal pollution due to process problems.
Finished product testing: The finished product is tested for heavy metal content to ensure that its lead content is lower than the limit specified by the RoHS directive (1000ppm).
4. Cooperation with suppliers
Choosing a reliable raw material supplier is an important guarantee for achieving lead-free:
Supplier audit: Sign an environmental protection agreement with the supplier, requiring it to provide raw materials that comply with the RoHS directive, and conduct regular audits and tests.
Supply chain management: Establish a sound supply chain management system to ensure the traceability of raw materials and avoid products that do not meet environmental protection requirements due to raw material problems.
5. Regulatory tracking and compliance verification
The RoHS directive may be updated based on technological progress and environmental protection requirements. Companies need to track regulatory changes in a timely manner:
Regulatory research: Regularly study the latest requirements of the RoHS directive to ensure that products meet the latest environmental standards.
Compliance verification: RoHS certification of products through third-party testing agencies to ensure product compliance in the EU market.
