Polycarbonate (PC) is a commonly used engineering plastic with excellent mechanical and chemical properties. During processing, storage, and application, PC comes into contact with air, and the external environment can easily affect its structure and performance, leading to varying degrees of aging of the material, which impairs its properties and service life.

The interior of an automobile is a complex environment constructed from a variety of materials, including leather, plastics, fabrics, adhesives, shock absorption and sound insulation materials, etc. During the processing and usage stages, these materials continuously emit hundreds of volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs). Collectively, these substances form what we perceive as the "in-vehicle odor".

Company A reported to our center that it had commissioned a third-party testing institution to conduct a tensile strength test on PA6 material. The result showed it was qualified (≥140MPa), but the internal test result of Company A was unqualified (125-135MPa). Due to the significant difference between the test results, Company A commissioned the Analysis and Testing Center of NERC-APM to conduct a root cause analysis of this abnormal situation.

After approximately a century of development, a variety of light sources are available for laboratory use, including enclosed carbon arc lamps, sunlight-type carbon arc lamps, fluorescent ultraviolet lamps, xenon arc lamps, metal halide lamps, and high-pressure mercury lamps. The technical committees related to polymeric materials under the International Organization for Standardization (ISO) mainly recommend three types of light sources: sunlight-type carbon arc lamps, fluorescent ultraviolet lamps, and xenon arc lamps.

The mechanical response and failure mode of materials under high strain rates are completely different from those under static conditions. The static design criteria, analysis, calculation, and verification used in engineering are entirely inconsistent with those under high strain rates—meaning the current static response characteristics of materials cannot meet the needs of simulating and predicting the deformation modes and failure modes of automotive components under special stress conditions.

Two-color injection molding refers to an injection molding process where two materials of different types or colors are plasticized separately, then injected into the mold cavity sequentially or simultaneously to produce plastic molded products with two different colors or material types.

In recent years, with the enhancement of food safety awareness and the in-depth advancement of sustainable development strategies, the safety and environmental friendliness of Food Contact Materials (FCMs) have become the focus of global attention. China has increasingly tightened safety supervision over food contact materials, and its standard system has been continuously improved. On September 16, 2025, five national standards for the determination of food contact materials under the GB 31604 series will be formally implemented. These new standards not only provide a more scientific testing basis for traditional food contact materials but also pose new challenges to the emerging post-consumer recycled plastics (PCR).

In the field of plastic mechanical property testing, impact strength is a core indicator for evaluating material toughness, which is directly related to the impact resistance and safety reliability of plastic products in practical applications. As the mainstream method for measuring plastic impact strength, pendulum impact testing has its result accuracy restricted by multiple factors, and the selection of hammer weight (corresponding to pendulum energy) is an easily overlooked yet crucial link among them.

In recent years, quantitative nuclear magnetic resonance (QNMR) technology has been increasingly widely applied in the standards for characterizing the microstructure of polymeric materials. What is the principle of QNMR? What is its specific operational procedure? And how is it specifically applied in material structure characterization? This article will introduce the role of QNMR through a case study, where a dual-chain catalyst is used to control the degree of long-chain branching (LCB) in polyethylene, thereby influencing the macroscopic physical properties of the material.

In the field of plastic processing, melt viscosity and melt strength are two crucial yet frequently confused core parameters. They are like the "blood" and "bones" in the plastic processing process, jointly determining the processing behavior of materials and the final product performance. A comprehensive understanding of the essential differences, interactions, and accurate testing methods between the two is of vital guiding significance for optimizing production processes, improving product quality, and developing new materials. This article will delve into the basic concepts of melt viscosity and melt strength, their application differences in processing, testing technologies, and their synergistic effects in actual production, providing a systematic reference framework for practitioners in the plastic industry.

In the world of injection molding, the performance parameters of plastic materials are by no means dull laboratory data—they are the "soul map" that runs through product design, mold manufacturing, process setting, and quality control. Behind every set of numbers lies the behavioral code of the material under specific conditions; a deep understanding and flexible application of these parameters are the keys to achieving efficient, stable, and high-quality production. This article will take a number of core performance parameters as clues to systematically elaborate on their guiding value for the entire injection molding process.

The specific heat capacity is the amount of heat absorbed or released when a unit mass of a substance increases or decreases in temperature by 1℃, which reflects the material's ability to absorb or release heat.