There is no fixed standard for the replacement cycle of the liquid tank sealant of the high-efficiency air outlet. The core factors depend on the quality of the sealant, the usage environment, and the test results of the sealing performance. The industry’s general reference and judgment basis are as follows:
Regular replacement cycle
High-quality liquid tank sealant (such as polyurethane-based liquid tank sealant with aging resistance and anti-shrinkage properties) can be replaced once every 2-3 years in a stable environment of a 100-level or higher cleanroom;
If using ordinary liquid tank sealant or if the cleanroom has large temperature fluctuations, corrosive gases, or high dust concentration, it is recommended to replace it once every 1-2 years.
Criteria for immediate replacement
Visual inspection: If the liquid tank sealant shows hardening, cracking, shrinking, flowing, or there are gaps at the bonding point with the frame;
Leak detection test: When using DOP/PAO leak detection, if the leakage rate at the filter and liquid tank sealing area exceeds the standard, and the filter itself is not damaged, the liquid tank sealant needs to be replaced;
Maintenance operation: When replacing the high-efficiency filter, it is recommended to check the condition of the liquid tank sealant at the same time. If the surface of the sealant is uneven or impurities are mixed in, it should be cleaned and re-filled.
Additional precautions
When replacing the liquid tank sealant, it is necessary to thoroughly clean the residual residue of the old sealant to avoid residual impurities affecting the sealing effect;
After filling the new sealant, it needs to be left to solidify (usually 24-48 hours). During this period, it is prohibited to install the filter or start the air supply system.