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How to determine whether the temperature resistance of sealant meets the requirements?
How to determine whether the temperature resistance of sealant meets the requirements?To determine whether the temperature resistance of the sealant meets the requirements, you can start from the following aspects:View product technical data Product instructions: Regular sealant product instructions will mark its applicable temperature range. For example, silicone sealant can usually maintain good performance in the temperature range of -50 ° C to 200 ° C, while the temperature range of polyurethane sealant may be around -40 ° C to 120 ° C. If the temperature of the environment is within the range marked in the manual, it is initially in line with the requirements in terms of temperature resistance. Technical data sheet: The technical data sheet will provide more detailed temperature performance parameters, such as hardness changes at different temperatures, tensile strength retention rate, elastic modulus, and other data. These data can be used to more accurately evaluate the performance of the sealant under specific temperature conditions. For example, after a sealant is maintained at 150 ° C for 1000 hours, the tensile strength retention rate can still reach more than 80%, indicating that it has good temperature stability at this high temperature. Refer to relevant standards and certifications. Industry-standard: Different industries have different standard requirements for the temperature resistance of sealant. For example, in the construction industry, for the sealant used for external wall sealing, it may be necessary to meet the requirements of the temperature resistance in GB/T 14683-2017 "Silicone and modified silicone building sealant", that is, after cyclic testing in a certain temperature range, the performance change of the sealant should be within the allowable range. Certification mark: Some authoritative certification bodies will test and certify the temperature resistance of sealant, such as UL certification, VDE certification, and so on. If the sealant product has these certification marks, it indicates that it has been rigorously tested and its temperature resistance meets the relevant standards. Conduct actual testing High-temperature test: The sealant sample is baked under conditions higher than the maximum temperature of the use environment, for example, if the maximum temperature of the use environment is 100 ° C, the sample can be baked at 120 ° C or higher for a certain time, such as 24 hours, 48 hours, and then observe the appearance of the sealant changes, such as whether there is cracking, foaming, flowing, discoloration and other phenomena. At the same time, test its physical properties, such as tensile strength, hardness, etc., and whether there is a significant decline. If the appearance and performance change little, it indicates that its temperature resistance is good. Low-temperature test: The sealant sample is placed under conditions lower than the minimum temperature of the use environment, such as the minimum temperature of the use environment is -20 ° C, the sample can be placed at -30 ° C or lower temperature for some time, such as 24 hours, and then check whether the sealant becomes hard and brittle, loses elasticity, whether cracks appear, etc., and then test whether its performance can be restored to normal levels after thawing. If it can be recovered, it indicates that it has good temperature resistance at low temperatures. Thermal cycle test: Simulate the temperature change in actual use, and carry out several high and low temperature cycle tests on the sealant sample. For example, multiple cycles from -20 ° C to 80 ° C are carried out to observe the performance changes of the sealant after multiple thermal cycles, such as whether the sealing performance decreases and whether fatigue damage occurs. The thermal cycle test can more comprehensively evaluate the temperature resistance of the sealant in the environment of temperature fluctuations. |
