Hi all, need your opinion regarding this issue. In my work place, the vinyl raised floor are turning yellowish on surface in a process room. The yellowish is actually a stain that can be removed by using scrubbing & cleaning, but it will be appeared again after certain period. After clarification with vinyl floor supplier, it can be confirmed that not due to vinyl degradation. The only abnormality found is [b]nitrite[/b] level at the process room is at high level. So hope anyone can share if relevant experience in this case or any ways that can clear this issue. Thanks

The floor would seem to be the litmus paper for an out of control outgassing situation. I would not like to think how the product is performing with high nitrite levels. You need to fit some chemical prefilters in the air con to mop it up.

Regards,
Dick Gibbons (committee member of the BSI LB I 30 in the UK and convenes 14644 part 8 and 10 for Chemical contamination)

Hi, Thanks for your comment. So you mean using litmus paper to test the yellowish stain whether it is acidic or alkaline? Will it be a permanent solution to install AMC filters at the affected area to get rid of the current situation? Any possibility if high level of nitrite or ammonia ion will cause any yellowish appearance in the environment? Please advice. Thanks

Litmus paper should not have been taken literally, its an english phrase for "indication". What I am saying is with that level of chemical in the air we should worry about the product and not the floor. Their air conditioning system needs to have chemical filters fitted to take this out of recirculation air and yes it will be permanent if we look after the filters properly.

Regards,
Dick Gibbons (committee member of the BSI LB I 30 in the UK and convenes 14644 part 8 and 10 for Chemical contamination)

So far there was no impact to our product as they were sitted inside FOUP. But our NOX level in the process area seems getting higher recently. Other than installing chemical filters on top of FFUs, is there any other alternative solution can improve this kind of scenario? Any recommendation for Chemical Filters? Thanks

It is just normal because the gas affects the vinyl. You should have to install an exhaust fan to let the gas go away, and it couldn't make your floor yellowish repeatedly. The link below will teach you on how to take care for the invested vinyl.

http://www.wfca.org/resilient/care.aspx