Photovoltaic Tin-Coated Ribbon Product Certification

Core Content of Certification

The photovoltaic tinned solder ribbon product certification focuses on the quality and performance of the product, examining the following aspects:

Dimensional Accuracy: Testing whether the width, thickness, and deviations of the solder ribbon meet standard requirements, including dimensional specifications for different products such as interconnects and bus ribbons. Dimensional accuracy directly affects soldering quality and module production efficiency.

Coating Quality: Testing indicators such as the thickness, uniformity, and adhesion of the tin coating to ensure the ribbon surface is smooth and flat, the coating is uniform, and there are no burrs or flash. Coating quality directly affects the solderability and conductivity of the ribbon.

Solderability: Testing the soldering effect between the ribbon and photovoltaic cells during the soldering process, including soldering strength, wettability, and soldering temperature adaptability, to ensure good soldering reliability during module production.

Conductivity: Testing the resistivity or conductivity of the ribbon to ensure excellent electrical performance, meeting the requirements for current collection and transmission in photovoltaic modules. High-quality ribbons typically use premium oxygen-free copper as the base material to ensure conductivity.

Aging Resistance: Conducting accelerated aging tests such as high-temperature aging and damp-heat aging to test the performance stability of the ribbon during long-term use, ensuring reliability over the 25-year design life of photovoltaic modules.

Restriction of Hazardous Substances: Testing whether the product complies with environmental requirements such as the EU RoHS directive, limiting the content of hazardous substances like lead, mercury, cadmium, and hexavalent chromium. Lead-free and leaded solder ribbons cater to different market demands.

Certification Process

The photovoltaic tinned solder ribbon product certification typically includes the following stages:

Application and Document Submission: Select a third-party testing institution with CNAS and CMA qualifications, and submit documents such as the business license, product technical specifications, material composition description, and production process description. The certification body conducts an initial compliance review of the application materials.

Product Sampling and Inspection: The certification body sends personnel to the production site or finished product warehouse for sampling, and the samples are sent to a qualified laboratory for testing. Test items include dimensional measurement, coating thickness testing, solderability testing, resistivity testing, aging resistance testing, and hazardous substance testing.

Corrective Actions and Re-testing: If non-conformities are found during testing, the enterprise must analyze the cause, implement corrective actions, and resubmit samples for re-testing. Complete records and evidence of corrective actions must be retained.

Certification Decision and Issuance: After passing all tests, the certification body issues a formal test report and certification certificate, confirming that the product meets the requirements of GB/T 31985-2015, and affixes the CNAS or CMA mark.

Post-certification Surveillance: The certification body provides annual surveillance audit services to confirm that the product continues to meet certification requirements. Enterprises should establish an internal quality control mechanism and regularly test raw materials and mass-produced products.

Value of Certification

Ensuring Photovoltaic Module Quality: Tinned solder ribbon is a key material for electrical connections between cells in photovoltaic modules. Its quality directly affects the module's conductivity, soldering reliability, and long-term stability. Certification effectively helps select qualified supplier products.

Enhancing Product Market Competitiveness: Enterprises that obtain photovoltaic tinned solder ribbon product certification can use the certification mark on product packaging and promotions, demonstrating product quality reliability to photovoltaic module manufacturers. Leading industry companies such as Suzhou Yourbest New Materials Co., Ltd. have received "Jiangsu Premium" certification. According to search results, in 2024, Yourbest's photovoltaic tinned solder ribbon product was included in the list of certified enterprises for "Jiangsu Premium." The company was recognized as a manufacturing "Single Champion" enterprise, leading the global market with its technological foresight, product innovation, and quality stability, becoming a "frontrunner" in the photovoltaic tinned solder ribbon segment.

Meeting Procurement Access Requirements: In supplier audits and procurement tenders by photovoltaic module manufacturers, product certification certificates are important qualification documents. Certification results can serve as a key reference for supplier quality management capabilities.

Standardizing Production and Quality Improvement: The certification process drives enterprises to establish standardized production processes and quality control systems, including raw material procurement (e.g., high-quality oxygen-free copper), rolling precision control, hot-coating process control, and final product inspection, thereby improving overall technical management levels.

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