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How to choose a sealant for the DOP tank hepa box sealant tank?
How to choose a sealant for the DOP tank hepa box sealant tank?In choosing the sealant suitable for the hepa box sealant tank for the DOP tank, the following aspects need to be considered:Performance requirement Good sealing: This is the most critical performance, to be able to form a reliable airtight seal between the liquid tank and the filter or related components, to prevent air leakage, and to ensure the cleanliness of the air supply system. Such as polyurethane sealant, has excellent elasticity and resilience, can adapt to a certain degree of deformation, and maintain a good sealing effect. Temperature resistance: Select the appropriate sealant according to the temperature range of the environment. In general, the liquid tank sealant needs to maintain stable performance in the temperature range of -50 ° C to 200 ° C to adapt to different working environments, such as in some workshops with special process requirements, there may be higher or lower temperature changes. Chemical stability: The sealant should have acid and alkali resistance, oil resistance, aging resistance, and other characteristics, which will not be due to long-term contact with air, dust, chemicals, and other deterioration, and degradation, affecting the sealing performance. For example, silicone sealant has good chemical stability and is not susceptible to erosion by external chemicals. Self-adhesive and self-healing: During the filter installation and replacement process, the sealant may be damaged to a certain extent, and the sealant with self-adhesive and self-healing can automatically restore the sealing effect and reduce the risk of leakage. Like some silicone sealants has a better self-healing ability. Low volatility: the sealant should minimize volatilization, avoid producing harmful gases or affecting the air quality of the clean room, and also prevent the performance of the glue from decreasing due to volatilization. Material compatibility: The sealant needs to be compatible with the materials of the DOP tank air supply outlet, such as aluminum profiles, cold-rolled steel plates, stainless steel, etc., to ensure that there is enough bonding strength and no degumming phenomenon. For example, polyurethane sealant has good adhesion with a variety of metal materials. Operating performance Viscosity: The viscosity should be moderate, and easy to pour and construct. If the viscosity is too high, it is difficult to pour into the glue tank, and it is not easy to evenly spread; If the viscosity is too low, it may cause the glue to flow and affect the sealing effect. In general, the liquid tank sealant should have a low viscosity before curing, easy to operate. Curing time: The curing time can not be too long, otherwise it will affect the efficiency of installation and maintenance, but it can not be too short, to avoid adequate adjustment and operation during the construction process. It is usually hoped that the sealant can be initially cured within a few hours at room temperature to reach a certain strength, which is convenient for subsequent work. Environmental protection and safety: Choose non-toxic, tasteless, non-corrosive sealant to ensure the health of operators and the safety of equipment. Especially in the clean rooms of the pharmaceutical, food, and other industries, environmental protection is more important, and sealants containing harmful substances should be avoided. Certification and standards: Select sealants that have passed relevant industry certifications and standards, such as complying with GMP (pharmaceutical manufacturing quality Management Practice) requirements. For example, the sealant used for the air supply outlet of DOP liquid tanks in pharmaceutical factories needs to meet the requirements of the new GMP-E specification for sealing performance and cleanliness. Brand and quality: Choose well-known brands and reliable quality of sealant, you can understand the brand reputation and quality of sealant by consulting product information, user evaluation, consulting professionals, and other ways. High-quality sealant is more guaranteed in terms of performance stability and quality consistency, which can reduce the failure and maintenance costs caused by sealant quality problems. The common sealants suitable for DOP liquid tank air outlet sealants are polyurethane sealants, silicone sealants, and so on. Among them, polyurethane sealant has the characteristics of high tensile strength, excellent elasticity, wear resistance, oil resistance, and cold resistance. Silicone sealant has good weather resistance, chemical stability, and low-temperature flexibility, and most of them are neutral and have no corrosive effect on metals and other materials. |
