[time-nuts] Fan Filters

Charles P. Steinmetz charles_steinmetz at lavabit.com
Wed Sep 15 21:20:28 UTC 2010

Mark wrote:

>Urethane technology has come a long way since the 5370 came 
>out...  but given time,  all urethanes seem to revert to their primordial goo.

It was for this reason that I started using the ScotchBrite 
sheets.  3M originally supplied both uncoated and abrasive-coated 
material (the latter marketed for metal finishing and automotive 
painting applications).  I have both, and it is not hard to tell the 
difference.  However, my stash is over 20 years old, and I do not 
know what 3M makes now (in particular, whether they still supply 
uncoated grades).

As others have noted, there are several sources of materials that are 
intended for air-filtration service.

Best regards,


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