There is no fixed number of days for reassessing gas contamination in a clean room after decoration. There is no fixed number of days that applies to all materials and projects. Pre-use and subsequent representative testing should be arranged based on material release, normal ventilation status, temperature and humidity, and equipment protection objectives. Before asking 'how many days', you must first ask 'what will be measured, where it will be measured, and under what conditions'.
Why is there no unified number of days?
Gas release after decoration is a process that changes with time, and the release rate is affected by material type, dosage, temperature and humidity, ventilation volume and degree of completion of decoration. For the same coatings and adhesives, the release cycle may be significantly longer in an environment with high temperature, high humidity, and insufficient ventilation than in an environment with dry, low temperature, and good ventilation. Therefore, 'how many days after decoration can it be put into use' is used to make unified judgments, ignoring individual differences. A more reasonable approach is to set detection nodes and criteria, and decide whether it can be put into use based on the detection results, rather than advancing according to the calendar.
Materials list determines what to focus on
Before reassessing, a list of materials used in the renovation and installation process should be compiled, including coatings, adhesives, sealants, boards, flooring, insulation materials and cleaning agents. Different materials release different components. Some are mainly organic solvents, while others may release acidic or alkaline components. The material list can help determine the testing objects and sampling methods, and avoid using only the total amount of TVOC to cover all points of concern. If certain materials are used in large quantities or have obvious odors, they should be listed as key targets for investigation. Regarding the relationship between material outgassing and sensitive processes, please refer toWhat are the implications of low outgassing chemical filter media for sensitive processes?。
Testing should be carried out under normal ventilation conditions
The ventilation volume is often large in the early stage after decoration, and the test results at this time may be lower than the actual operating status. Re-evaluation should be carried out after the clean room returns to normal air supply, pressure difference and temperature and humidity conditions, because the chemical filtration section and the number of room air changes only represent actual working conditions during normal operation. If the test is only done with windows open for ventilation or temporary high air volume, the concentration may rise after the air volume is adjusted after being put into use. Temperature, humidity, air volume and operating status should also be recorded during inspection to facilitate subsequent comparison. For the arrangement of sampling periods, please refer toThere is a peculiar smell only when the machine is turned on. At what time should the gas be measured?。
Set up nodes before and after commissioning.
A more practical approach is to set up two nodes: confirm that the gas level meets the requirements before being put into use, and retest according to the actual operating status after being put into use. Testing before putting into use is used to determine whether entry is allowed, and retesting after putting into use is used to confirm that gas control is still effective under actual operating conditions (including equipment operation, personnel activities and process releases). For sensitive processes or equipment-side micro-environments, the protection positions should also be inspected separately after the equipment is in place. The detection conditions and point locations of the two nodes should be kept as consistent as possible to facilitate comparison. For methods to distinguish pollution sources, please refer toHow to distinguish whether workshop pollution comes from outside or inside?。
Aili industrial supporting equipment
For projects that are re-evaluated after renovation, we usually recommend that customers first sort out the material list, determine the detection objects and nodes, and then determine whether the existing filtering configuration covers these objects. Aili Industry can provide selection packages for box-type, flat-plate and V-type chemical filtration products. For box-type MAU packages, please refer toMAU box type chemical filter , product series can be viewedChemical filter product range . Device-side applications can useChemical filter FFU type, integrated chemical adsorption layer withHEPA/ULPA filter particle filtration. After decoration, the circulating filtration section can be adjusted according to the test results. The manufacturing end covers independent R&D and production of motors and fans, control systems, sheet metal and complete machine assembly. Circulating air volume, filter section positions and detection points can be checked in the same package, and non-standard structures can be adjusted according to on-site space. The specific gas effect, applicable environment and replacement cycle still need to be verified based on the corresponding configuration data and on-site working conditions. The actual results are subject to on-site leak detection and gas detection results.
Related questions and answers
Is it okay to ventilate it for a week after renovation and then test again?
The time can be used as a reference, but what is more critical is whether the ventilation status and temperature and humidity during detection are close to normal operating conditions. It is recommended to test again after normal air supply and pressure difference are restored.
The decoration smell is not obvious, is it possible not to detect it?
Not recommended. Odor is not a reliable indicator of all components, and some ingredients are present in low concentrations but may affect the process. Inspections should be arranged according to the material list and target objects.
Can Aili Industrial assist with post-decoration filter configuration verification?
You can check whether the chemical filtration section needs to be adjusted based on the material list, test results and circulating air volume. The specific plan needs to be confirmed based on product data and on-site working conditions.
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