What should I do if the ULPA sealing strip ages or falls off? Failure inspection and replacement

If the ULPA filter sealing strip is aged, broken or peeled off, you should check the material condition, contact surface and usage environment, and replace it according to the confirmed specifications. Sticking back to the original position does not mean the sealing performance is restored. The failure of the sealing strip is rarely due to a single reason - it may be that the material is incompatible with the cleaning agent, it may be disassembled and assembled too many times, or it may be long-term wear and tear of the burrs on the mounting surface. If you only deal with the surface phenomenon, the problem will occur soon after replacement.

1. Determine the cause of failure: Hardening, deformation, cracking and bonding failure should be looked at separately.

Observe the hardening, compression deformation, cracking and bonding status, and check the cleaning agent, temperature and humidity, and disassembly and assembly history to avoid new failure of the new sealing strip.

Hardening usually points to material aging or chemical incompatibility; compression deformation is concentrated near the compression point, indicating uneven distribution of stress; cracking often occurs at corners or folds, which is related to installation stress and material flexibility; bonding failure depends on the compatibility of the adhesive and the frame material. Aili Industry isIn the non-standard ULPA filter project, the compatibility of the sealing materials will be confirmed according to the cleaning agents and disinfection methods used in the project. This information can be determined at the selection stage, instead of guessing the reason after the sealing strip fails. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Confirm that the replacement parts match: the thickness, width, hardness and joints are all particular.

Check thickness, width, hardness, joints and compatibility. Materials that appear similar may have different compression properties and cannot be substituted by color alone.

The compression characteristics of the sealing strip are determined by the material hardness and cross-sectional shape. If the thickness is different and the hardness is different, the actual compression amount after compression will be different. Aili Industry isThe supporting instructions for the liquid tank seal ULPA filter and gasket sealing structure clearly specify the specifications of the seal. When replacing, you can confirm the corresponding specifications according to the model;the FFU fan filter unit are also matched according to the model. The seals on the box side of For the relationship between seal specifications and compression structure, please refer toHEPA FAQs and Selection Guide。

3. Complete verification after installation: cleaning, positioning, tightening, and re-inspection are indispensable.

Clean the remaining glue without damaging the frame, position and tighten it according to regulations, and recheck the installation seal. Record material batches and processing procedures.

If the residual glue is not cleaned thoroughly, there will be local bulges when the new sealing strip is applied; positioning deviation will cause the sealing surface to shift; improper pressing force may cause over or under pressure. Aili Industrial has a process sequence of glue removal, positioning, pressing and visual inspection for seal installation in the entire machine assembly process. This sequence can be converted into on-site replacement operation steps. After the replacement is completed, an installation leak test should be performed to confirm that the sealing surface is continuous. For the cooperation between sealing installation and leak detection, please refer toULPA ultra-high efficiency filter FAQ and selection guide。

4. If the sealing strip only falls off in one place, check the condition of the entire circle.

When the sealing strip falls off in only one place, the aging and stress of the entire ring should also be checked. It is not advisable to stick only a small section without confirming the seam. Partial shedding often indicates that the force or material state at that location is different from that of the surrounding area. There may be aging of the same batch in other locations in the same circle.

Aili Industry isWhen the ULPA ultra-high-efficiency filter is delivered, seal batch information can be provided. The project party will record the replacement batch and time in the maintenance ledger to facilitate the judgment of whether the entire circle needs to be replaced simultaneously. The aging conditions of the internal seals of the equipment can be referred tothe fan filter unit on the EFU equipment side .Instructions related to

5. Related questions and answers

Do I need to replace the entire filter element to replace the sealing strip?
Depending on the status of the frame, media, glue joints and project rules, different failure ranges should be evaluated separately. When the sealing strip itself is replaceable, it does not have to be scrapped as a whole.

Can the sealing strip be glued back and continue to be used?
Sticking back to the original position does not mean the sealing performance is restored. The compression characteristics of aging or deformed sealing strips have changed and should be replaced according to regulations.

Why does the sealing strip always come off at the same place?
It may be related to the stress there, accumulation of detergent or the condition of the mounting surface. The cause should be investigated instead of repeated pasting.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

Liquid tank seal ULPA ultra high efficiency filter

Liquid tank seal high efficiency filter

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industry isHEPA/ULPA filter seals are matched with materials according to the use environment. Different cleaning agent types, temperature and humidity ranges, and disassembly and assembly frequencies result in different sealing materials. Compatibility can be confirmed at the selection stage.The supporting instructions for the liquid tank seal ULPA filter and gasket seal structure clearly specify the seal specifications and parameters.The FFU fan filter unit box side seals are matched according to the model; the glue removal, positioning, pressing and appearance inspection processes in the entire machine assembly process can be converted into on-site replacement steps.The delivery of ULPA ultra-high efficiency filter can be accompanied by seal batch information.Non-standard ULPA filter projects can confirm sealing materials according to cleaning and disinfection methods. Provide process objectives, installation drawings, operating conditions and acceptance requirements, and can further communicate ULPA standard specifications, non-standard interfaces, samples and batch matching. The specific parameters and test range are based on the confirmed model and technical documents.