> Does anyone know what grades of Cab-o-Sil are acceptable for use with
> epoxy? Looking on the package for my stuff from MAS, there is no product
> designation and there is no detail given at the MAS web site. Cabot lists
> about twenty different varietes at their web site. They have untreated and
> treated (with what appears to be a wetting agent) and they have different
> bulk densites, which would be related to particle size. I have access to
> large quantities (10-pound bags) of Cab-o-Sil M-5 here at work and I was
> wondering (without having to do some destructive testing) if this material
> would work. Thanks in advance.

> Dennis

Hi Dennis, Before becoming acquainted with epoxy additives, my only familiarity with silica fume (cab-o-sil) was as an additive for cement (concrete) mixes ... I was under the impression that that marine silica fume was was selected for its white color as much as anything else - I think other silica fume is grey. Just a guess!