This article introduces how to use a thermal shock test chamber to evaluate the thermal shock resistance of polymer films. The test involves rapidly alternating the film between high and low temperatures to simulate severe temperature fluctuations that may occur in real-world applications, thereby inducing thermal stress within the material. The article explains the testing equipment, commonly used standards, specific operational procedures, and how to assess film damage in terms of appearance, dimensions, and mechanical properties. Finally, it emphasizes that such testing helps understand the material's resistance to temperature changes, providing valuable insights for product design and material selection.

2026-04-15

This article introduces how to use a hot air aging chamber to test the long-term thermal-oxidative life of engineering plastics. The test is based on the Arrhenius equation, which accelerates material aging at high temperatures to simulate performance changes in actual use. The article details the required equipment, standard procedures, including specimen preparation, aging operations, and performance monitoring. During data analysis, the material's service life at conventional temperatures is extrapolated from performance decay curves at different temperatures. Additionally, the article points out key influencing factors such as temperature uniformity and airflow rate, while cautioning that extrapolated results have certain limitations. This method provides an important reference for evaluating the durability of engineering plastics.

2026-04-15

This article introduces how the positive pressure method sealing tester evaluates the pressure resistance of packaging. The instrument simulates actual pressure conditions by injecting compressed air into the packaging and then monitors pressure changes to detect any leaks. The article explains that its working principle is based on pressure decay detection and lists several testing modes, such as inflation release, pressure holding, burst, and creep tests. Key performance parameters include pressure control accuracy and sensor resolution, and standardized testing procedures are crucial for result reliability. Test data can be used to compare packaging materials, monitor production processes, and provide a basis for transportation safety.

2026-04-15

The negative pressure leak detector evaluates the sealing integrity of vacuum packaging by simulating a differential pressure environment. The instrument places the sample in a testing chamber and creates a negative pressure by evacuating air. If there is a leak, air or liquid will infiltrate the packaging, and the result is determined by observing pressure changes or the presence of bubbles. The operation must follow relevant standards, such as ASTM F2338, and attention should be paid to factors like packaging materials and testing parameters. This method features a simple principle and convenient operation, making it suitable for quality control across various industries, including food and electronics.

2026-04-15

This article introduces the method of measuring the hardness of rubber seals using a Shore durometer. The Shore durometer works by pressing an indenter into the rubber surface under spring force, converting the depth of indentation into a hardness value, typically using the A scale. Testing must comply with ISO or GB standards to ensure that sample thickness, ambient temperature, and other conditions meet requirements. During operation, the instrument must be calibrated, pressure applied vertically, and readings taken quickly, with multiple measurements averaged for accuracy. The results are influenced by factors such as sample thickness, temperature, and indenter dwell time. The hardness value can be used for quality control and performance analysis. Regular maintenance and calibration of the durometer are essential to ensure measurement accuracy.

2026-04-15

A rubber rotorless rheometer is used to measure the torque-time curve during the vulcanization process to evaluate the crosslinking degree and vulcanization characteristics of rubber. The instrument oscillates the sample in the test cavity and measures the torque changes, generating a curve that includes the scorch, vulcanization, and over-vulcanization stages. Key parameters such as minimum torque, maximum torque, scorch time, and optimum cure time can be extracted from this curve. Testing must adhere to standards such as ISO and ASTM, while controlling factors such as temperature and sample condition to ensure accuracy. This method is widely applied in the rubber products industry to optimize formulations, monitor process stability, and predict product performance.

2026-04-15

The rubber abrasion tester evaluates wear resistance by simulating the friction between tires and road surfaces. It uses a grinding wheel to rub against rubber samples under set conditions, measuring mass loss and converting it to volume loss to assess material performance. Common methods include the Akron, Grasselli, and Lambourn tests, with the choice depending on the specific wear type and standards. Test results are influenced by factors such as load, grinding wheel characteristics, and environmental conditions, requiring strict control to ensure accuracy. The data can be used to compare different formulations, optimize designs, and for quality control. However, there are differences between laboratory testing and actual road wear, so it is often used as a preliminary evaluation method in combination with other tests for comprehensive judgment.

2026-04-15

This article introduces how haze transmittance meters are used to evaluate the optical clarity of vision correction products such as contact lenses. Haze refers to the blurriness caused by light scattering, while transmittance reflects a material's ability to transmit light. Together, these two factors determine clarity. The instrument operates based on the integrating sphere principle, calculating values by measuring total transmitted light and scattered light, and adheres to international standards such as ASTM. Measurement results can be applied to product development and quality control, analyzing the impact of materials, processes, surface treatments, and environmental factors on optical performance. With technological advancements, measurements are evolving toward higher precision and more comprehensive data analysis.

2026-04-15

This article introduces the method of measuring the sheet resistance of conductive polymer films using a four-probe resistivity tester. Sheet resistance is an important parameter for evaluating the electrical conductivity of thin films. The four-probe method involves passing a current through the outer probes and measuring the voltage with the inner probes, then calculating the resistance using a formula. This approach avoids the influence of contact resistance and improves measurement accuracy. The article details the measurement principles, instrument components, standard operating procedures, and analyzes the effects of film uniformity, contact conditions, and environmental factors on the results, along with corresponding precautions. This method is applicable to various conductive polymer films and can provide reliable data for material research and applications.

2026-04-15

This article introduces the method of measuring the transmittance of anti-reflection coatings using a UV-Vis-NIR spectrophotometer. The instrument is based on the Beer-Lambert law, calculating transmittance by comparing the light intensities of the sample and the reference, covering a broad spectral range from ultraviolet to near-infrared. Attention must be paid to sample preparation, instrument calibration, and standard operating procedures during measurement to minimize errors. The performance of the coating can be evaluated through transmittance data using indicators such as peak values, bandwidth, and average values. This method is widely applied in fields such as photovoltaics and optical lenses, providing a reliable basis for thin-film research, development, and quality control.

2026-04-15

This article introduces how a melt flow indexer measures the processing fluidity of high-temperature engineering plastics. It first explains the working principle of the instrument, which involves measuring the rate at which molten plastic flows through a standard die under specific temperature and pressure conditions to obtain the melt flow rate value. The article then highlights key considerations when testing high-temperature materials, such as precise temperature control, the equipment's high-temperature resistance, and thorough drying of the sample. It subsequently outlines the standard testing steps, including preparation, loading, pressure application, cutting, and calculation. Finally, it mentions that the measured data is primarily used for quality control, process optimization, and research and development reference, but also notes that this method mainly reflects fluidity under low shear conditions, and other tests may be required in practical applications.

2026-04-15

This article introduces the use of a pendulum impact testing machine to evaluate the impact strength of glass fiber-reinforced nylon. The test is based on the principle of energy conservation, where the energy absorbed by the material is calculated by measuring the height difference of the pendulum before and after impacting the specimen, thereby quantifying its impact resistance. The testing process must adhere to standards such as ISO and ASTM, with strict control over factors such as specimen preparation, ambient temperature, and humidity. Analysis of the results shows that glass fiber content, distribution, and testing conditions all influence the impact strength data. This method is commonly used for material quality assessment in fields such as automotive and electronics. Future research incorporating technologies like high-speed cameras can further investigate material failure mechanisms.

2026-04-15

This article introduces the method of using a heat deflection temperature tester to evaluate the heat resistance of carbon fiber-reinforced plastics. The instrument applies a fixed load to the material while heating it, measuring the temperature at which the material reaches a specified deformation, thereby assessing its short-term resistance to thermal deformation. The article explains the testing principle, the preparation of standard specimens, and outlines key steps such as loading, uniform heating, and data recording. It also notes that the results are influenced by material factors such as fiber content and resin type, as well as testing conditions like load and heating rate. Finally, it suggests combining this method with other thermal analysis techniques for a comprehensive evaluation, providing valuable insights for material development and application.

2026-04-15

The Vicat softening point tester evaluates the heat deflection temperature of special engineering plastics by heating and applying a load to measure the temperature at which the indenter penetrates the plastic sample to a specified depth. The test follows standards such as ISO and ASTM, and the results are influenced by factors such as material composition and processing conditions. This data can be used for material comparison, design reference, and process monitoring, serving as an important standardized method for assessing the heat resistance of plastics.

2026-04-15

This article introduces a method for determining the curing degree of polymer optical waveguide materials using differential scanning calorimetry (DSC). The curing degree is a key indicator affecting material performance, and this instrument quantitatively analyzes it by measuring the thermal effects during the curing reaction. The article explains the fundamental principle, which involves calculating the enthalpy change of the reaction by comparing the heat flow difference between the sample and a reference material to determine the curing degree. During testing, factors such as sample preparation, heating rate, and atmosphere control must be carefully considered. The practical application is demonstrated using epoxy-based materials as an example. Finally, the importance of standardized procedures and condition control for ensuring result accuracy is emphasized.

2026-04-15

This article introduces how to use a simply supported beam impact testing machine to evaluate the brittle fracture characteristics of carbon fiber plates. During the test, a pendulum strikes the specimen, and the energy absorbed by the material during fracture is calculated based on the energy difference, which helps determine its tendency toward toughness or brittleness. The article explains specimen preparation, testing procedures, and data analysis methods, and notes that factors such as fiber orientation and layup structure can influence the results. This approach helps understand the material's fracture behavior under dynamic impact, providing valuable insights for material development and quality control.

2026-04-15

This article introduces a method for testing the bending fatigue life of flexible OLED films using a tensile testing machine. The test simulates repeated bending to evaluate the accumulation of damage in the film under cyclic stress, monitoring performance changes to determine the failure point. The article details the testing principles, equipment configuration, operational procedures, and data analysis, emphasizing the need to control parameters such as bending radius and frequency, and standardize the recording of results to support the quantitative assessment of material reliability and the advancement of flexible display technology.

2026-04-15

This article introduces how a leak tester detects air leakage points in flexible packaging bags. It primarily identifies leaks through changes in pressure or vacuum, requiring sample preparation, parameter setting, and standardized testing during operation. The results help locate common leakage points, such as heat-sealed edges, thereby improving production processes. In the future, this technology will become more intelligent and efficient, supporting online detection and standardized development.

2026-04-15

This article introduces a method for determining heavy metal content in rubber using atomic absorption spectrometry. It begins by explaining that rubber may contain harmful elements such as lead and cadmium, which require accurate measurement. It then explains the basic principle of atomic absorption spectrometry, which involves quantifying the concentration of elements by measuring the absorption of light at specific wavelengths by atoms. The article details sample pretreatment steps, such as acid digestion, and how to optimize instrument conditions, including selecting the atomization method and adjusting parameters. Finally, it mentions calculating concentrations using a standard curve and controlling interference factors to ensure accurate and reliable results. This method is suitable for quality control of rubber products and environmental safety assessments.

2026-04-15

Thermogravimetric analyzers measure changes in sample mass through programmed temperature control, enabling the quantitative determination of carbon black content in rubber. During experiments, the sample is first heated in an inert atmosphere to decompose the rubber while retaining the carbon black. The atmosphere is then switched to an oxidizing environment to oxidize the carbon black. The carbon black content is calculated based on the mass loss. This method is simple to operate, yields reliable results, and is widely used for quality control and material research in the rubber industry.

2026-04-15