Polyolefins are the most productive and widely used synthetic resins worldwide, and are indispensable in modern industry and daily life.

Plastic valve bodies are widely used in chemical, mechanical, electronic and other fields due to their advantages such as light weight, corrosion resistance and low cost. However, they have low surface hardness and poor wear resistance. To improve performance, metal coatings (commonly nickel plating or zinc plating) are applied via electroplating, electroless plating and other processes. Coating thickness is a key quality indicator. An excessively thin coating fails to provide effective protection, leading to early failure and leakage of the valve body. An overly thick coating wastes precious metals, increases costs and tends to cause stress cracking. Therefore, thickness testing is essential.

As midsummer approaches and outdoor temperatures rise, enclosed car cabins easily turn into unbearable "mobile saunas" under scorching sun exposure. This not only severely compromises riding comfort but also directly affects consumers' perception of vehicle quality. For automotive headliner manufacturers, breaking through this pain point and developing truly heat-insulating, comfortable and high-quality headliner products has become the key to gaining market competitiveness.

PC is a common engineering plastic characterized by high strength, good toughness, low shrinkage, and excellent electrical insulation properties. It is widely used for housings and insulating components in electronic and electrical products. However, parts molded from PC are prone to stress cracking, which limits its application in certain product designs.

In high-end manufacturing sectors such as aerospace, new energy vehicles and wind power, fiber-reinforced polymer matrix composites have become core materials driving industrial upgrading due to their outstanding advantages including high specific strength, high specific modulus and lightweight design. However, such materials have a critical drawback: extreme sensitivity to impact damage. Minor out-of-plane impacts, such as hail strikes, tool drops and gravel collisions, can cause internal damages like delamination and matrix cracking that are barely detectable by visual inspection. This can significantly reduce their load-bearing capacity and pose a serious threat to structural safety.

In the new year, National Advanced Polymer Materials has continued to increase investment in high-end scientific research and testing equipment. Focusing on the cutting-edge application evaluation demands of the polymer materials industry, we have completed the supplementation and upgrading of core instruments, further improving the testing accuracy, efficiency and analytical depth for materials used in strategic emerging industries such as drones, robotics, new energy and semiconductors.

With continuous technological advancements, fast-charging technology has achieved remarkable breakthroughs in the new energy vehicle sector. Mainstream charging power has surged from 150kW–350kW to the megawatt level.

National Advanced Polymer Materials Analysis & Testing Center houses **8 specialized laboratories** covering major technical fields. As a testing division under the Public Service Platform for Industrial Innovation of the National Advanced Polymer Materials Industry Innovation Center, it is committed to providing innovative public services for the polymer materials industry.

In the manufacturing of modern high-speed transportation equipment such as automobiles, aircraft, aerospace vehicles and high-speed trains, adhesives have become indispensable technologies for achieving key structural performance due to their excellent lightweight and high-efficiency joining characteristics. Under harsh actual service conditions, such adhesive-bonded structures are not only subjected to static loads, but also continuously exposed to high-strain-rate dynamic loads including collision, impact and severe vibration, as well as extreme temperature variations ranging from cryogenic to high-temperature environments. These complex working conditions significantly alter the micromechanical response and macroscopic failure mechanism of adhesives. Once joint failure occurs, it directly affects the integrity of the overall structure and human safety.

Plastic materials are widely used in various fields such as industrial production, daily life, and high-end manufacturing. Their mechanical properties, flame retardancy, thermal properties, and other indicators directly determine the quality reliability, service safety, and applicable scenarios of the final products. In the research and development, production, factory inspection, and application verification of plastic materials, performance testing is an indispensable core step. The preparation of standard specimens serves as the prerequisite and foundation for ensuring scientific, accurate, and comparable test results.

Recently, National Advanced Materials Polymer Materials Industry Innovation Center Co., Ltd. (hereinafter referred to as “National Advanced Materials”) has passed stringent audits and been awarded the Qualification Certificate for Third-Party Laboratories for Passenger Vehicles issued by the BYD Passenger Car Laboratory Accreditation Committee (hereinafter referred to as “BYD”).It has officially become one of the core technical service partners for polymer material performance evaluation in BYD’s passenger car sector, marking a new chapter for both parties to collaborate and empower industrial upgrading.

The neutral salt spray test and the alternating salt spray test are two types of corrosion environment tests that are frequently used in salt spray tests. The neutral salt spray test generally uses a standard salt spray test chamber, while the alternating salt spray test uses a composite salt spray test chamber due to its more complex test conditions and processes. What are the differences between the two?