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Ah, another MSDS where the bulk of the stuff is a "trade secret". I can't find the link right now, but somewhere fairly recently I have read that less than 5% of all MSDSs utilize a trade secret provision of the OSHA rules on hazard communication. I don't recall seeing PPG use such a provision in their MSDSs, but I haven't reviewed a lot of them. It's very suspicious that the 50-75% secret portion of the product has a TLV of 0.005 ppm - a very low level that is common for most iso compounds. Compared to the levels noted for the listed hazardous chemicals, you'd think there was something especially nasty in that secret part of the mix, wouldn't you?. You don't suppose it could contain some isos? Their vague respirator information is simply useless for most people. Similar to the Valspar stuff we were talking about, there is also some wording farther down in the text that refers to "isocyanate vapors" - out of the blue, under decomposition products. You indicate that an isocyanate is indicated on the can label and that supplied air is mentioned, albeit at 10xTLV and greater. Looks like the can label is more informative than the MSDS but still not practically usable by most DIYs. My understanding of TLV is noted in my post below to souNdguy. It's only my understanding of it and I could be wrong - I am not a student of such things, but am familiar with some of the terminology, having been involved in industrial ventilation design in the past. The 10x reference is the same as 3M is using in their cartridge respirator guidelines. However, it's a useless variable for anyone not in a booth that's given periodic official industrial hygiene surveys to verify expected and reasonably consistent exposure levels. Any bureaucratic system such as the OSHA has loopholes, I am sure. There are probably individuals who make their living exploiting them. Sorry, but I am getting a bit cynical here. I cannot rationalize why a hazardous chemical like one of the isocyanates gets listed on a can label but doesn't show up explicitly in the MSDS for that very same product. The MSDS is supposed to be the official document for notification of the presence of hazardous materials to employers and end users. If the quantity of the chemical is high enough to require can labelling, then it should be high enough to require listing on an MSDS and not be buried in some trade secret mix. If anyone can explain this situation to me, I'd love to hear about it. Rod
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