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I. Introduction to Chemical Rubber and Plastic Materials: Based on their areas of application, Youer Testing classifies chemical rubber and plastic materials into the following three categories to facilitate understanding: Engineering materials: These are rubber and plastic materials primarily used for protecting electrical and electronic circuits, such as ABS, HIPS, PC, PS, PBT, PVC, etc.; they are characterized by being relatively hard. Wiring and cable materials: These are primarily rubber and plastic materials used for the insulation and sheathing of optical and electrical cables, such as PVC, PP, PE, FEP, SR, XLPE, etc., and are characterized by their softness. Chemical insulating materials: These are insulating materials with voltage-resistant properties, primarily used to protect the connections in electronic devices; examples include Varisil, heat-shrink tubing, fiberglass sleeves, electrical tape, wire strapping, glue, and so on. UL certification standards: Primarily, the UL94 flame retardancy test standard and relevant product standards are used to evaluate flame retardancy and other performance aspects. Product CCN: Mainly QMFZ2/8; Part 1: Interpretation of UL Yellow Cards; Origin of Yellow Cards. UL is the abbreviation for Underwriter Laboratories Inc., the American insurance testing laboratory. UL is the most authoritative third-party testing and certification body in the United States, as well as around the world, specializing in safety testing and assessment. The UL Yellow Card refers to the card containing the safety evaluation data resulting from UL testing and certification. Because the color is yellow, it is called a “yellow card”. The UL Yellow Card was a yellow card printed by UL at the request of customers, in the early days when the Internet did not exist; it was provided on a fee-based basis to customers who had passed UL certification, and contained information such as the company name, address, and authorized models. Now, information related to UL certification can be found online on the UL official website (www.UL.com), so few people use it anymore. (II) Characteristics of the UL Yellow Card: The UL Yellow Card includes the following 10 important performance indicators. Physical properties include color, thickness, flame retardancy rating, Relative Thermal Index (RTI), Heat Wire Ignition (HWI), and environmental performance (f1, f2). Electrical properties include High Arc Ignition (HAI), High Voltage Arc Tracking Rate (HVTR), dielectric strength under dry arc conditions (D495), and Leakage Current Tracking Index (CTI). (III) Where can I find information on the UL Yellow Card? The official UL Yellow Card lookup address is: https://iq.ulprospector.com/en/?_ga=2.161093301.901060645.1510358421-578495310.1510358421. At present, the UL official website is not available to the public for free; only customers who have been certified by UL can access it to perform searches. If you need to inquire about information related to UL certification, you can consult the relevant staff at Youer Testing. III. Solving the challenges of sample production in the rubber and plastic industry. For a long time, sample preparation has been a major issue plaguing the chemical and rubber/plastic materials industry; whether it is for research and development, sample testing, certification, or customer sample approval, standardized sample production is essential. Due to the high requirements for sample preparation, the small number of samples needed, the necessity to create custom molds, and the use of specialized molding machines, companies are required to acquire such machines; however, since they are used infrequently, preparing samples on their own proves to be very uneconomical – it results in significant waste, high costs, and long processing times. 1. Molding: Test samples need to be produced according to specified standard dimensions; in particular, for engineering-grade hard plastics, plastic molds must be created. The cost of mold making is high, the process takes time, and there are many different specifications to consider. 2. Sample preparation: The sample preparation process is time-consuming and labor-intensive; carrying it out manually can disrupt normal production (for example, the drying step alone takes a long time and consumes a lot of electricity, sometimes up to 4 or 5 hours). Additionally, related processes such as installing the upper and lower molds, cleaning the barrel, and injection molding must also be completed. 3. Testing: The purchase of a large number of testing devices, the recruitment and training of testing personnel, the calibration and routine maintenance of instruments and equipment, as well as the verification of testing methods and capacity comparisons – all these impose a huge burden on enterprises. To address the long-standing problems related to sample preparation and testing in the chemical and rubber/plastic materials industry, Youer Testing is the first testing laboratory in China to establish a dedicated sample preparation center for such materials. Covering an area of over 300 square meters, it is equipped with more than 10 sets of relevant sample preparation equipment. Whether it’s engineering materials, wire and cable materials, or chemical insulation materials, as long as the client provides the raw rubber and plastic materials, we can assist them in preparing standard samples in accordance with the size requirements specified by standards from various countries around the world! Youer Testing’s Chemical Materials Testing Center and Sample Preparation Center offer a one-stop solution for sample preparation, testing, and certification of chemical rubber and plastic materials. Youer Testing looks forward to communicating with you and working together! IV. Main services provided by Youer Testing’s Chemical Materials Testing Center and Sample Preparation Center: (1) Consultation on global certification agencies (especially UL certification services for rubber and plastic raw materials, injection-molded parts, paints, coatings, spray surface treatments, wire and cable compounds, etc.); (2) Preparation of material samples; (3) Full set of tests and certification applications for UL Yellow Card; (4) Comprehensive testing of wire and cable materials in accordance with standards from various countries around the world; (5) Exclusive provision of molds for sample production (we prepare the samples using materials supplied by the client); (6) Comprehensive testing of engineering materials and wire and cable materials in accordance with standards from various countries around the world; (7) Training and guidance regarding global certification processes for rubber and plastic products. V. Testing capabilities of Youer Testing’s Chemical Materials Testing Center: This center is equipped with over 500 sets of testing equipment for physical, electrical, chemical, environmental, flame-retardancy, and other related tests. Whether it’s engineering materials, wire and cable materials, or chemical insulating materials, we are able to meet the testing requirements of standards from various countries around the world. At the same time, we have a specialized workshop for preparing samples from chemical and rubber plastics materials, covering an area of over 300 square meters. Equipped with more than 10 sets of sample preparation equipment, it is capable of meeting the requirements for sample preparation according to standards from various countries around the world. VI. Customers Certified by Youer Testing Services Youer Testing is the first testing and certification institution in China to have developed a systematic approach for UL94 certification of chemical rubber and plastic materials. We have successfully assisted over 200 rubber and plastic material companies, including Jinfafa, Bailichun, Zhejiang Wanma, Shenzhen Haochang, Guangya Plastics, Ningbo Dachuan, Xiamen Hongshengxing, Dongguan Yujie, Shenzhen Gaoke, Yuyuan Technology, Zhangjiagang Meite, Dongguan Songqi, Nantong Anguang, Jiangxi Fushangmei, Dongguan Dongyi, Hangzhou Sanjisi, Suzhou Chaojie, Suzhou Tianmai, Longtai, Kanghui, Fujian Changde, Zhoukou Huaxun, Ningbo Dongyuan, Jiangmen Guangtong, Dongguan Baisheng, Dongguan Hongyu, Suzhou Huashida, Suzhou Haolailai, Hangzhou Kate, Anhui Wenxi, Changshu Junma, Changzhou Baijia Nian Dai, Dongguan Puqiang, Hubei Xiangyuanxin, Dongguan Lanfeng, Huizhou Xinheng, and Chengdu Hongxinyuan, in obtaining the QMFZ2-UL94UL certification. Youer Testing’s Chemical Materials Testing Center and Sample Preparation Center offer a one-stop solution for sample preparation, testing, and certification of chemical rubber and plastic materials. Youer Testing looks forward to communicating with you and working together! Regarding Yuer Testing, Yuer Testing Certification (abbreviated as YCCT) was established in 2009. To date, it has set up two international testing laboratories: the Yuer Testing South China Testing Center (Huizhou, Guangdong) and the Yuer Testing Central China Testing Center (Ji’an, Jiangxi), as well as five branches in Ji’an, Shenzhen, Suzhou, Chengdu, and Huizhou. The total area for offices and laboratories amounts to over 25,000 square meters, and the company owns more than 1,000 sets of advanced testing instruments and equipment. It provides comprehensive services to over 10,000 customers from around the world in the new energy industry and the electronics information industry, including those involved in rubber and plastic polymers, optoelectronic cables, connectors, charging guns, and charging stations. These services include professional and systematic product certification, testing, global safety training, and assistance with laboratory planning and construction. Youer Testing and Certification is a globally renowned safety compliance training institution that has always adhered to the training principles of \"uniform standards, uniform methods, and uniform evaluations.\" Taking it as its responsibility to impart knowledge and resolve doubts, it has held over 50 lectures worldwide as well as more than 1,000 corporate-specific training sessions, training more than 35,000 participants from across the globe. The first practical guide to testing and certification in the world, titled \"Safety Regulations Manual,\" published by Youer Testing and Certification, is now in its fourth edition. A total of 25,000 copies have been printed, and it has become an essential resource for over 5,000 companies around the world, playing a positive role in promoting widespread knowledge of global standard certifications! Accreditation: **CNAS-accredited laboratory, CMA-accredited laboratory; **High-tech enterprise, specialized and innovative enterprise in Guangdong Province; **Science and technology small and medium-sized enterprise. Laboratory authorized for witnessing tests by UL in the United States, TUV Rheinland in Germany, CSA in Canada, and IMQ in Italy. Laboratory recognized by the Shenzhen Robotics Special Cables Association. Business philosophy: Guided by standards, upholding fairness and public interest, providing expertise and solutions, and ensuring safety. Main business areas of Youer Testing and Certification: (1) Global product certification and system certification: ◇ Product certification services such as UL, CCC, CSA, CE, TUV, ETL, VDE, PSE, KTL, GS, FDA, FCC, e-Mark, SASO, GOST, DOT, TQM, CPR; ◇ International quality system certifications such as ISO9001, ISO14000, IATF16949, ISO45001, SA8000 ； (2) Global standard testing services: Testing for physical, electrical, chemical, environmental protection, ecological, large-scale combustion, EMC, RF, low-smoke halogen-free, toxicity, and other parameters. (3) Training in global certification testing skills: Corporate-specific training, training for laboratory operators, training for safety engineers, and specialized skill training