RoHS Compliance Control Guidelines for Export Processing of Chinese Injection Molds

Chinese injection molds exported to Europe, America and other overseas markets must comply with the latest RoHS environmental protection directives. Although molds are not terminal electronic products, harmful substances contained in mold processing materials, surface treatments, lubricants and anti-rust agents may migrate to plastic parts during long-term injection molding production, resulting in customer compliance failures, customs detention and return of goods. In order to standardize the whole manufacturing process of Chinese export injection molds and eliminate hidden environmental risks in cross-border trade, this paper systematically sorts out the full-process RoHS compliance control standards for material admission, machining, surface treatment, assembly and delivery.

1. Raw Material Admission RoHS Control

All mold steel, standard parts, fasteners and processing auxiliary materials must implement strict RoHS access management. Suppliers shall provide official RoHS test reports and compliance declarations for each batch of materials. Mold steel such as S136, NAK80 and P20 shall be strictly inspected for lead and cadmium content, and recycled steel and uncertified raw materials are prohibited from being used for export molds.

All purchased standard parts including springs, screws and sealing rings must adopt environmentally friendly materials. Metal fasteners are forbidden to use hexavalent chromium electroplating process, and only trivalent chromium environmental protection treatment is allowed. Rubber seals and plastic gaskets shall be free of brominated flame retardants and phthalate plasticizers. Processing auxiliary materials such as cutting fluid, polishing paste, cleaning agent and anti-rust oil must provide valid RoHS certification. Chlorine-containing cutting oil and auxiliary agents with heavy metal additives are completely banned. All qualified materials are marked with RoHS labels and stored in independent environmental protection material areas to prevent cross mixing with ordinary non-compliant materials.

2. Machining Pollution Isolation Control

Special RoHS processing areas and independent machine tools are designated for export injection molds to avoid cross-contamination from ordinary mold processing. Before production, the equipment is thoroughly cleaned, residual old cutting fluid, metal debris and oil stains are completely removed, and new environmentally friendly cutting fluid is replaced.

Operators must wear dust-free gloves during the whole process to prevent sweat and grease from contaminating the mold cavity. Machining tools, fixtures and polishing consumables are used exclusively for RoHS molds. Workshop daily 5S cleaning is strengthened to reduce dust and metal particle pollution. During wire cutting and grinding processes, waste residues are collected in a classified and closed manner to prevent heavy metal residues from adhering to the mold surface and causing migration pollution in subsequent injection molding.

3. Surface Treatment and Polishing Compliance Control

Surface treatment is the high-risk link of RoHS non-compliance. All export molds prohibit hexavalent chromium passivation and hard chromium plating. Mold surface anti-wear treatment adopts gas nitriding, PVD coating and trivalent chromium environmental protection electroplating. Salt bath nitriding and high-pollution surface processes are strictly forbidden.

In the mirror polishing stage, only heavy-metal-free diamond polishing paste and environmentally friendly suede materials are used. After polishing, the mold cavity is ultrasonically cleaned and wiped with anhydrous ethanol to completely remove residual polishing materials. For mold anti-rust protection, only RoHS certified anti-rust oil and dry anti-rust agent are allowed, and coating on the molding surface is prohibited to avoid contaminating plastic products during molding.

4. Assembly and Trial Production Compliance Management

Assembly workshops set up special RoHS assembly stations. Adhesive glue, anaerobic glue and lubricating grease used for mold assembly must meet RoHS standards without halogen and phthalate substances. Before mold closing, the cooling water channel is fully cleaned with pure water to flush out processing impurities and residual oil stains.

The trial injection materials must be environmentally friendly certified plastic raw materials. Trial-produced plastic parts are sampled for RoHS detection to confirm no harmful substance migration. If abnormality occurs, the mold shall be disassembled, cleaned and re-inspected immediately. After assembly, the mold cavity is comprehensively cleaned and sealed with environmentally friendly PE protective film to isolate external pollution.

5. Packaging, Warehousing and Delivery Standards

Export molds are stored in independent dust-free environmental protection warehouses with constant temperature and humidity. PVC protective film containing plasticizer is prohibited. Outer packaging adopts qualified IPPC wooden boxes or environmentally friendly cartons, and bromine-containing foam fillers are forbidden.

Before delivery, QA verifies all material reports, surface treatment certificates and trial production test data. All compliance documents are archived and delivered with the mold to meet overseas customer audit and customs supervision requirements. Batch traceability records are established for all export molds to realize full-life cycle compliance management.

Summary

The RoHS compliance control of Chinese export injection molds focuses on cutting off the migration path of harmful substances in the whole manufacturing process. Strict material access, independent processing isolation, environmental-friendly surface treatment, standardized assembly and compliant delivery are the core control points. Scientific and standardized RoHS management can effectively avoid cross-border environmental compliance risks, ensure that molded plastic products meet EU and international environmental protection standards, and greatly improve the qualification rate and international market competitiveness of Chinese exported injection molds.