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?

During the design and manufacturing of connectors, the warpage of plastic components is a critical issue that severely compromises product quality. Such deformation impairs the weldability of the product and induces other functional failures, which can lead to customer complaints and potentially significant economic losses. This paper systematically analyzes the underlying mechanisms of warpage from the perspective of product structural design and explores a comprehensive range of effective control strategies.

PEEK/CF composites exhibit excellent performance, but their complex multiphase microstructure has a decisive impact on their properties. Around the fibers, a highly oriented transcrystalline layer is often formed due to heterogeneous nucleation. In addition, spherulites and amorphous regions are also present in the matrix. The local modulus, hardness of these different morphological regions, and their responses under load directly affect the overall stiffness, strength, toughness, and damage evolution behavior of the composites.

Application of MAT_58 Material Card in Simulation Analysis of Composite Material Undertrays for New Energy Vehicles

As an important quality control activity, laboratory comparison is of great significance for improving laboratory management level, the operational skills of testing personnel, and ensuring the accuracy and validity of test results. It is not only an effective supplement to the internal quality control of laboratories, but also an important means to enhance customers' trust in laboratories and improve their competitiveness. To further promote technical exchanges and development in the field of polymer material testing, National Advanced Materials Analysis and Testing Center will continue to carry out 17 laboratory comparison activities in 2026. The relevant arrangements are hereby notified as follows:

From history to standards, from principles to applications: fully understanding the core role and testing logic of sunshine carbon arc lamps in JIS D0205.

In modern manufacturing, especially in high-end equipment, automotive industry, precision electronics and new materials, the surface and three-dimensional morphology of products are no longer simple “appearance” issues, but core quality indicators directly related to performance, reliability and service life.A micron-level step, a nanometer-scale scratch, or an inconspicuous warpage deformation can all become the “Achilles’ heel” of product failure.Traditional contact measurement and two-dimensional visual inspection are often inadequate when facing complex curved surfaces, special-shaped structures and micro-morphologies, with incomplete data and low efficiency.

High-nickel cathode materials are currently the mainstream high-specific-energy cathode materials, featuring high capacity, appropriate cost, and other advantages. However, the thermal stability of high-nickel cathode materials still needs to be improved, which largely limits their upper application limit, especially in fields such as electric vehicles and large-scale energy storage. At present, the evaluation mechanism for the thermal stability of high-nickel cathode materials is not yet clear, and there is a lack of uniform standards for its measurement. Therefore, it is crucial to develop a unified and standardized thermal stability evaluation mechanism.

Owing to its unique electrical insulation properties, crosslinked polyethylene (XLPE) can effectively prevent current leakage and arc formation. Currently, one of its largest application areas is in wires and cables. This characteristic is closely related to the crosslinking degree of XLPE. Crosslinking of polyethylene increases the barrier paths for current passage, thereby improving insulation resistance; the higher the crosslinking degree, the greater the insulation resistance. However, excessive crosslinking will lead to insufficient elasticity and susceptibility to aging, thus affecting service life. Therefore, an appropriate crosslinking degree of polyethylene must be maintained in the production process to meet application requirements.

In plastic injection molding, ensuring the melt can completely fill the mold cavity is the first step to successful production. As a standardized and intuitive evaluation method, the Spiral Flow Test is widely used to quantify the flowability of resins, thereby directly predicting their mold-filling capability. By measuring the flow length of the resin in a spiral flow channel under specific processing conditions, this method provides critical data for material selection, process setting, and quality control.

On December 15, 2025, the European Chemicals Agency (ECHA) reached a unanimous agreement at its December meeting to identify n-hexane as a Substance of Very High Concern (SVHC). Another substance, 4,4'-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]diphenol (BPAF) and its salts, was designated as an SVHC without the involvement of the Committee. ECHA will add these two substances to the Candidate List of Substances of Very High Concern in February 2026, bringing the total number of substances on the list to 253 at that time.