This article primarily discusses how to select an appropriate flash point tester based on the flash point range of coatings and safety regulations. The flash point is a crucial indicator for measuring the flammability of coatings, and flash point testers are divided into closed-cup and open-cup types. Closed-cup flash point testers simulate enclosed environments, making them suitable for testing low-flash-point coatings and commonly used to assess storage and transportation risks. Open-cup flash point testers simulate open environments, making them suitable for testing high-flash-point coatings, which better aligns with real-world application scenarios. When selecting a model, factors such as the flash point level of the coating, specific requirements of relevant safety regulations, and practical application conditions must be considered to ensure accurate and compliant test results, providing a basis for safety management.
2026-04-17
The selection of a laboratory grinder should be based on the fineness requirements of the coating. Fineness greater than 50 microns is considered coarse dispersion, 10 to 50 microns is medium fineness, and less than 10 microns requires high fineness dispersion. Ball mills work through the rolling and impact of grinding media, making them suitable for medium and higher fineness levels. They can handle high-viscosity materials and are easy to maintain, but their efficiency is relatively low. Sand mills rely on high-speed shear forces to achieve fine dispersion, offering high efficiency in the range of 1 to 10 microns and are suitable for medium to low viscosity materials, though their structure is more complex. When selecting a grinder, if the fineness is above 10 microns and the viscosity is high, a ball mill may be chosen. If high fineness below 10 microns is desired, a sand mill is more appropriate. It is recommended to verify the suitability of the equipment through small-scale pilot experiments.
2026-04-17
This article introduces two commonly used methods for measuring moisture in coatings: the Karl Fischer method and the halogen heating method. The Karl Fischer method is a chemical titration technique that measures trace moisture through the reaction of iodine with sulfur dioxide. It offers high precision but is relatively complex to operate. The halogen heating method, on the other hand, is a physical drying technique that determines moisture content by heating the sample and weighing it. It is simple to operate, fast, and suitable for routine testing. When selecting a method, factors such as measurement accuracy, sample characteristics, testing efficiency, and cost should be considered to meet specific detection needs.
2026-04-17
When selecting a laboratory disperser, it is crucial to evaluate the dispersion capacity and speed range. The dispersion capacity should be determined based on parameters such as material viscosity and solid content to avoid uneven dispersion or localized overheating caused by excessive or insufficient volume. The speed selection should be combined with the structure of the dispersion head, and the optimal range should be identified through stepwise experiments to ensure appropriate shear force. During the selection process, the synergistic relationships among parameters must also be considered, matching the equipment's power with its heat dissipation capability. Additionally, safety regulations should be followed for testing and validation to ensure the reliability and efficiency of experiments.
2026-04-17
This article discusses how to choose a standard light booth, focusing primarily on light source configuration and observation environment. For light sources, several basic parameters need to be considered, such as color temperature, color rendering index, and illuminance. These must remain stable to ensure accurate color evaluation. Common light source types include D65 and D50, which simulate daylight, and incandescent light source A, among others. Different industries use different types. The observation environment is also crucial: the background should be neutral gray, external light interference should be avoided, and the viewing angle should be fixed. When selecting a light booth, it is essential to consider industry standards and sample characteristics, as well as routine maintenance, including regular calibration and lamp replacement, to ensure the equipment remains reliable.
2026-04-17
This article primarily discusses how to choose the right disperser for laboratory research and process development. Small-scale laboratory dispersers have low processing capacity and are mainly used for experiments and determining process parameters. Pilot-scale dispersers have higher processing capacity and are used to verify whether these parameters can be scaled up for production. Key factors to consider during selection include processing capacity, energy input, shear effect, and material characteristics. Matching production capacity is not a simple scaling-up process; it must follow principles of similarity, such as maintaining consistent power input per unit volume or shear rate. In practice, it is essential to first establish parameters in the laboratory and then conduct step-by-step testing and adjustments on pilot-scale equipment to ensure a stable and reliable process.
2026-04-17
This article primarily discusses how to select the appropriate paint film cross-cut tester based on different adhesion testing requirements. First, it is essential to clarify the testing standards, as different standards have specific requirements for grid spacing, blades, and other factors. When selecting a model, several key parameters should be considered, such as the size of the grid spacing, the material and number of the cutter heads, the control of cutting pressure, and whether the equipment can adapt to the shapes of different substrates. The article also provides recommendations for different scenarios, such as using larger grid spacing for thick coatings and smaller spacing with sharper blades for thin coatings or soft substrates. Finally, it emphasizes that proper operation and regular calibration are crucial for ensuring accurate test results. In summary, there is no one-size-fits-all solution for model selection; the key is to match the specific testing conditions.
2026-04-17
This article introduces the method for determining the Taber abrasion resistance index of coatings using a rotary rubber wheel abrasion tester. During testing, the coated sample is pressed against a rotating rubber wheel, and abrasive materials are added to simulate wear. By measuring the mass or thickness loss of the coating after a fixed number of rotations, the abrasion resistance index is calculated, with higher values indicating greater wear resistance of the coating. The article details the equipment, standard procedures, data calculation, and influencing factors, emphasizing the importance of standardized operations for accurate results. It also notes that this method is suitable for evaluating the durability of various types of coatings.
2026-04-17
This article introduces a method for rapidly measuring the solid content of water-based coatings using a halogen moisture analyzer. Traditional oven methods are relatively slow, whereas this instrument uses a halogen lamp to heat the sample, allowing moisture and volatile substances to evaporate quickly while simultaneously weighing the sample in real time. The solid content can be calculated within minutes. During operation, it is important to ensure uniform sampling, set appropriate temperatures, and maintain a stable environment. This method is highly efficient, yields reliable results, and is suitable for quality control in coating production.
2026-04-17
This article introduces how to integrate opacity chart paper with spectrophotometers to achieve digital evaluation of opacity. Traditional methods rely on manual visual judgment, which is susceptible to light conditions and subjective factors. The new technology measures the reflectance spectra of coatings on the black and white areas of the chart paper, calculates color difference data, and thus objectively assesses opacity. This method improves the accuracy, repeatability, and efficiency of testing, making it suitable for quality control of materials such as coatings and inks. It also contributes to advancing industry testing toward standardization and data-driven management.
2026-04-17
This article introduces the method of measuring the refractive index of liquid coating resins using an Abbe refractometer and utilizing the relationship between refractive index and concentration to estimate concentration. It explains that the measurement is based on the principle of total internal reflection of light, and that under certain conditions, there is a linear relationship between refractive index and concentration. During operation, attention must be paid to instrument calibration, sample preparation, and temperature control. By establishing a standard curve, the concentration of unknown samples can be quickly determined. This method is used in coating production to monitor quality and adjust processes, offering greater efficiency and non-destructive testing compared to traditional methods.
2026-04-17
This article investigates a new process for achieving stepwise curing of coatings using a multi-stage temperature-controlled oven. Traditional constant-temperature curing sometimes yields suboptimal results, whereas this new method divides the curing process into several temperature stages, gradually increasing or decreasing the temperature like climbing steps. This approach allows for more precise control over the sequence of chemical reactions within the coating, such as enabling solvents to evaporate slowly first, followed by thorough cross-linking of the material. Experiments have shown that coatings cured in this way exhibit stronger adhesion, better impact resistance, and a more uniform surface. However, this process requires careful adjustment of the temperature curve based on different coating materials, resulting in a larger initial experimental workload. Overall, this is an effective method for enhancing coating performance.
2026-04-17
This article introduces the method of evaluating coating adhesion using a paint film cross-cut tester combined with the tape test. It first explains the principle of the method, which involves cutting a grid pattern on the coating surface with a cross-cut tool, applying and then peeling off adhesive tape, and observing the extent of coating detachment to assess adhesion. The article then provides a detailed description of the operational steps, including cleaning the sample, cutting the coating, applying and peeling off the tape. It also emphasizes the grading criteria, typically using a scale from 0 to 5, based on the proportion of coating detachment, and notes the need to be aware of differences in industry standards. Finally, the article mentions that this method is suitable for relatively thin coatings and that in practical applications, factors such as substrate condition and operational consistency should be considered. It also recommends combining standardized procedures to improve the comparability of results.
2026-04-17
This article introduces a method for measuring the hiding power of coatings using black-and-white checkerboard cards. The principle involves applying the coating onto the black-and-white grid, allowing it to dry, and then measuring the reflectivity of the black and white areas separately. A ratio closer to 1 indicates better hiding power. For the procedure, specialized cards, a reflectivity measuring instrument, and coating tools should be prepared. Coating, drying, and measurements should be conducted under constant temperature and humidity conditions. The result calculation is straightforward, but it is important to note that factors such as coating thickness, uniformity of application, and environmental conditions can affect accuracy. This method is intuitive to perform and effectively evaluates the hiding performance of coatings.
2026-04-17
This article introduces how to evaluate the wear resistance of wood and floor coatings using an abrasion tester. It first explains the importance of wear resistance for coating durability, then describes the testing principles, such as quantifying wear through abrasion formulas. The article lists relevant testing standards, such as ASTM D4060 and GB/T 1768, and emphasizes key steps in sample preparation and testing procedures, including equipment calibration and measuring mass loss. Finally, it analyzes factors affecting wear resistance, such as coating hardness and testing conditions, and provides practical testing recommendations. The overall aim is to offer scientific methods for evaluating and improving the wear resistance of coatings.
2026-04-17
This article introduces how the cupping test instrument evaluates the resistance of coatings on metal substrates to stamping deformation. It involves using a spherical punch to uniformly press against the back of a metal sample, causing the coating to stretch and deform along with the substrate. The performance is assessed by recording the stamping depth (cupping value) at which the coating first cracks or peels off. The article explains the basic components of the instrument, the standard testing procedure, and notes that a higher cupping value indicates stronger crack resistance of the coating. This method is widely used in industries such as automotive, appliances, and packaging to assess the durability of coatings during subsequent processing. Testing must adhere to relevant standards such as ISO and ASTM.
2026-04-17
This article introduces how the paint film T-bend tester is used to evaluate the flexibility and adhesion of coatings on metal sheet surfaces. During the test, the coated sample is gradually bent to observe whether the coating cracks or peels off, thereby determining the T-bend grade. A lower grade indicates stronger bending resistance of the coating. The article also explains the instrument's components, operational steps, result evaluation methods, and influencing factors. It highlights the important applications of this test in fields such as pre-coated metal coils and appliance casings, as it helps assess the performance of coatings during subsequent processing.
2026-04-17
The paint film conical mandrel bend tester simulates a gradually changing radius of curvature using a conical shaft to test the flexibility of coatings under small-diameter bending. After the coated sample is bent on the shaft, the location where cracks or peeling occurs is observed, and the corresponding minimum bending radius is used to evaluate performance. The article introduces the instrument's principles, testing procedures, and methods for interpreting results, and explains its applications in industries such as automotive and electronics, helping to analyze the durability of coatings under deformation.
2026-04-17
This article introduces how the coated cylinder bending tester measures the resistance of paint films to bending-induced cracking. The test evaluates the flexibility and adhesion of the paint film by bending a coated test panel around mandrels of different diameters and observing whether the film cracks. The article explains the instrument's principle, testing procedures, and result evaluation methods, and notes that factors such as coating thickness and substrate properties can influence the test outcomes. This test is widely used in industrial fields to help assess the durability of coatings under actual stress conditions.
2026-04-17
The wet film wheel gauge is a mechanical tool used to measure the thickness of wet coatings, based on the geometric relationship of three coaxial discs (two parallel outer wheels on the sides and an eccentric inner wheel in the middle). It is suitable for large-area continuous coating operations, such as coil or ship painting, offering advantages like ease of operation, low cost, and convenience for rapid continuous measurements, which aids in on-site immediate adjustment of coating parameters. During use, it is necessary to keep the tool clean, roll it at a uniform speed, and refer to relevant standard procedures. However, its accuracy is influenced by scale resolution and human reading errors, and it may have limitations on rough surfaces or sensitive wet films.
2026-04-17
