Agroshield
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If you believe the hierarchy here, he may have been working alongside a lot of carpenters:
Silica dust, what you need to know working on a building site
Silica dust is created when working on silica containing materials like concrete, mortar and sandstone, also known as respirable crystalline silica or RCS.
www.courtley.com
I mention this not to disagree but to give a sense of perspective where (the silica content of) gypsum dust sits in relation to other types of dust.
See also:
