This article compares the performance of electrochemical sensors and infrared sensors in composite gas detectors. Electrochemical sensors measure gas concentration by generating an electric current through gas reactions on electrodes. They offer fast response times and high sensitivity, making them suitable for detecting gases such as oxygen and carbon monoxide. However, they are susceptible to environmental interference and have a relatively short lifespan. Infrared sensors utilize the characteristic of gases absorbing infrared light, providing good stability and minimal cross-interference. They excel at detecting gases like carbon dioxide and methane but come with higher costs and are sensitive to moisture and dust. Both types of sensors have their respective advantages and are often used in combination in practical applications to enhance detection reliability and applicability.

2026-04-13

This article compares three common adhesion testing methods: the cross-cut test, the scribe test, and the pull-off test. The cross-cut test is simple to operate, involving grid cutting followed by tape peeling for rating, making it suitable for quick on-site testing of thinner coatings. The scribe test uses an instrument to create spiral scratches, allowing for quantitative analysis based on load or the number of cycles, and is often used in laboratories. The pull-off test directly measures the force required to detach the coating, yielding a strength value. While it provides objective results, the process is more cumbersome, making it commonly used for strict quality control. When selecting a method, factors such as coating thickness, testing accuracy, and the extent of damage to the sample must be considered.

2026-04-13

This article introduces two main methods of coating thickness gauges: the magnetic method and the eddy current method. The magnetic method is used to measure the thickness of non-magnetic coatings on magnetic substrates such as steel, based on the principle of detecting changes in magnetic flux. The eddy current method is suitable for non-conductive coatings on non-ferromagnetic metal substrates like aluminum and copper, where thickness is determined by measuring changes in the impedance of the probe coil. When selecting a method, the key is to base the decision on the electromagnetic properties of the substrate. In practical use, factors such as substrate shape, surface condition, instrument calibration, and measurement range must also be considered, and relevant standards should be followed to ensure accurate results.

2026-04-13

Differential scanning calorimetry analyzes the thermal properties of materials by measuring the heat flow difference between the sample and a reference material. The glass transition temperature of epoxy resin is a critical temperature at which it transitions from a glassy state to a highly elastic state, influencing material performance and applications. During testing, conditions such as sample mass and heating rate need to be controlled, typically following standard methods. The tangent method is used to determine the transition temperature from the heat flow curve. The results can be used to evaluate material formulations and the degree of curing, but attention must be paid to the differences between test conditions and practical applications.

2026-04-13

A rotational viscometer measures viscosity by calculating the torque experienced by a rotor rotating within a resin melt, thereby aiding in understanding the material's processing properties. For non-Newtonian fluids, viscosity varies with shear rate, so testing must be conducted under multiple conditions. Viscosity data is directly related to processes such as injection molding and extrusion, guiding the setting of parameters like processing temperature and pressure. To ensure accurate results, temperature must be controlled during testing, bubbles should be avoided, and relevant standards should be referenced. Different resins exhibit distinct rheological characteristics; for example, polyethylene shows significant shear thinning, while nylon has good flowability but requires control of injection speed. These data are crucial for optimizing production processes and ensuring product quality.

2026-04-13

This article introduces how to use a universal material testing machine to evaluate the mechanical properties of carbon fiber reinforced resin. Carbon fiber reinforced resin, known for its lightweight and high strength, is widely used in fields such as aerospace. By applying force, the testing machine can measure key properties of the material, including tensile, compression, bending, and interlaminar shear strength. The article emphasizes the importance of following standardized procedures, such as ISO and national standards, and covers sample preparation, machine setup, and data analysis. These test results are crucial for material development and quality control.

2026-04-13

The Vicat softening point tester is used to measure the thermal deformation resistance of resins by heating and applying pressure until the specimen deforms by 1 mm, recording the temperature at that point as the softening point. The test follows standards such as ISO and ASTM, and the results are influenced by the heating rate and applied load. It can be used to compare the heat resistance of different resins, such as polyethylene and polypropylene. However, it should be noted that this test is a conditional indicator and does not fully represent the long-term thermal resistance limit of the material. In practical applications, it is recommended to combine it with other tests for a comprehensive evaluation.

2026-04-13

A melt flow indexer is a device used to measure the flowability of thermoplastic resins. It determines the melt flow rate by calculating the mass or volume of the melt passing through a standard die every 10 minutes under specific temperature and pressure conditions. This indicator helps assess the material's processing performance in processes such as injection molding and extrusion. The testing follows standards such as ISO and ASTM, requiring control over conditions like temperature and load, as well as standardized operations to minimize errors. Although the test conditions are relatively simple and cannot fully simulate actual production, it still holds significant application value in material quality control and production monitoring.

2026-04-13

The Shore durometer measures hardness by pressing an indenter into the surface of a material, making it suitable for evaluating the properties of cast resins after curing. During measurement, standard methods such as ASTM D2240 must be followed, ensuring the sample surface is flat and conditioned in a standard environment. Select the Type A or Type D scale based on the hardness of the resin, and pay attention to factors such as the degree of curing, ambient temperature, and humidity, which can affect the results. After measurement, record the data and analyze the average value, combining it with other tests to comprehensively evaluate the material's performance. During operation, ensure the instrument is stable, avoid uneven surface areas, and calibrate the durometer regularly to maintain accuracy.

2026-04-13

This article introduces the method of using a UV aging test chamber to evaluate the weathering-induced discoloration resistance of resin. Weathering resistance refers to the ability of materials to resist performance degradation caused by outdoor climate, with discoloration being the most intuitive sign of aging. The test chamber accelerates the aging process of resin by simulating factors such as ultraviolet light, temperature, and humidity from sunlight. Key test parameters include UV spectrum, irradiance, temperature, and humidity. The degree of discoloration is measured using a colorimeter, quantifying color changes by calculating the color difference value ΔE*ab. Standardized operational procedures and result interpretation are crucial for obtaining reliable data. This method helps assess the weathering performance of resin, providing valuable references for material development and application.

2026-04-13

The xenon lamp aging test chamber accelerates the testing of the weather resistance of materials such as resins in the laboratory by simulating environmental conditions such as sunlight, temperature, and humidity. It primarily evaluates the impact of outdoor factors like light exposure, temperature, and humidity on the performance of resins, such as color changes and strength degradation. During testing, parameters must be set according to relevant standards to ensure that the experimental results correspond to outdoor aging. By monitoring indicators such as appearance and mechanical properties, the weather resistance of different materials can be compared, aiding in material selection and quality control. However, it is important to note the differences between laboratory testing and actual outdoor aging, and to conduct comprehensive evaluations based on practical conditions.

2026-04-13

This article introduces a method for testing the moisture absorption rate of resins in high-temperature and high-humidity environments using a hygrothermal test chamber. The test involves measuring the change in mass of the specimen before and after exposure to specific conditions (such as 85°C and 85% humidity) to calculate the moisture absorption rate, thereby evaluating the reliability of the resin in humid environments. The article elaborates on the testing principles, control of equipment parameters, influencing factors, and precautions, emphasizing the importance of standardized operations for obtaining accurate data, which aids in material research and development as well as quality control.

2026-04-13

This article introduces the method of measuring the moisture content of resin particles using a Karl Fischer moisture analyzer. The principle is based on the quantitative chemical reaction between reagents such as iodine and sulfur dioxide with water, and the moisture content is calculated by the volume of reagent consumed during titration. During measurement, attention should be paid to sample pretreatment, such as sealed storage, heating or the use of solvents when necessary, and controlling environmental humidity. Instrument parameters such as titration speed and stirring conditions need to be adjusted according to the type of resin to ensure accuracy. Additionally, the instrument should be calibrated regularly, and results should be verified through repeated experiments. The article also mentions potential interfering factors and solutions, and finally explains the importance of moisture content data for resin processing and quality control.

2026-04-13

This article introduces how to use a specific surface area analyzer to evaluate the pore structure of ion exchange resins. It mentions that pore structure is a key factor affecting the adsorption performance of resins, and gas adsorption methods, particularly low-temperature nitrogen adsorption techniques, are commonly used analytical approaches. Before testing, the sample needs to be cleaned and degassed. Nitrogen adsorption data is then measured to obtain adsorption isotherms. Parameters such as specific surface area, pore size distribution, and pore volume can be calculated using models like BET. These data help us understand the resin's performance, such as adsorption capacity and ion exchange rate. However, it is important to note that the testing is conducted under dry conditions, which may differ from the swollen state in practical applications. It is recommended to combine other analytical methods for a more comprehensive evaluation of the resin structure.

2026-04-13

This article introduces the method of measuring the light transmittance of resin solutions using a UV-Vis spectrophotometer. Light transmittance is an important indicator for evaluating the transparency of resins, which affects the appearance of products in industries such as coatings and adhesives. The instrument is based on the Lambert-Beer law, calculating light transmittance by comparing the light signals of the sample and the solvent. During operation, attention must be paid to instrument calibration, selecting appropriate cuvettes and solvents, and controlling solution concentration. The measurement results can be used to monitor process quality and evaluate product performance. This method is standardized in operation and can provide reliable data for production control.

2026-04-13

This article introduces how to use a colorimeter to measure the yellowing index change of transparent resin. Over time or under environmental influences, transparent resin tends to yellow, and the yellowing index quantifies the degree of color change. The colorimeter measures the chromaticity values of the sample in transmission mode and calculates the yellowing index using parameters such as the b* value according to standard formulas. For evaluation, it is essential to standardize sample preparation, instrument calibration, and measurement procedures, while controlling factors like thickness and cleanliness to ensure data accuracy. By comparing the index changes before and after aging, the performance of the material can be assessed, providing a basis for research, development, and quality control.

2026-04-13

This article introduces how to use a gloss meter to measure the gloss consistency of resin-coated film surfaces. The gloss meter determines glossiness by measuring specularly reflected light at specific angles and comparing it with a standard reference plate. Depending on the surface gloss level, appropriate angles such as 20°, 60°, or 85° should be selected for measurement. Factors affecting gloss consistency include raw materials, application techniques, and substrate conditions. During operation, the instrument must be calibrated, and multiple points on the sample surface should be measured. Consistency is evaluated by calculating the standard deviation of the measurements. The results can be used to monitor production processes and improve the stability of product quality.

2026-04-13

This article introduces the fundamental concepts, measurement principles, and practical applications of haze and transmittance in optical-grade resin materials. Haze refers to the extent to which a material scatters light, while transmittance reflects the ability of light to pass directly through. Measurements are typically conducted using the integrating sphere method, following international standards such as ASTM and ISO. The article also explains the components of a haze meter, the operational procedures, and key factors to consider during sample preparation and measurement, such as surface cleanliness and environmental control. These parameters are crucial for evaluating the optical performance of materials in fields such as display screens and packaging films.

2026-04-13

The Abbe refractometer measures the refractive index of resin liquids using the principle of the critical angle of light, where a corresponding relationship exists between the refractive index and concentration within a certain range. During operation, the instrument must be calibrated, the temperature controlled, and the prism cleaned before applying the sample. The reading is taken once the clear boundary between light and dark fields is adjusted. By establishing a standard curve of refractive index versus concentration, the concentration of unknown samples can be inferred. Attention must be paid to temperature, sample homogeneity, and system specificity to ensure accurate results. This method is widely used for process monitoring in fields such as chemical engineering and materials science.

2026-04-13

The arc resistance tester is used to evaluate the ability of insulating materials, such as resins, to withstand high-voltage arcs on their surface. During the test, a stepwise increasing arc voltage is applied between two electrodes on the resin surface under standard conditions, and the time until a conductive path forms or the material is damaged is observed to assess its performance. Factors such as the chemical structure of the resin, the type of fillers, and the testing environment can influence the results. This test provides valuable insights into the safety and reliability of insulating components in electrical equipment and is commonly used in material development and quality control.

2026-04-13