process for hot resin coating of shell sands using salicylic acid. jan united states patent .smillie.resin coated sand for use in forming shell molds and cores .phenolformaldehyde resin has been widely used heretofore in the .to seconds and then drying, crushing and sizing .sand as set forth in claim wherein at least a portion of said sali.
Silicosis (also known as miner's phthisis, grinder's asthma, potter's rot and other occupation-related names, or by the invented name pneumonoultramicroscopicsilicovolcanoconiosis) is a form of occupational lung disease caused by inhalation of crystalline silica dust, and is marked by inflammation and scarring in the form of nodular lesions in ...
Cancer and construction: Silica. This page tells you about silica and the risks to construction workers from silica. What is it? Silica is a natural substance found in varying amounts in most rocks, sand and clay. For example, sandstone contains more than 7
Fossils. The term "fossil" is used for any trace of past life.Fossils are not only the actual remains of organisms, such as teeth, bones, shell, and leaves (body fossils), but also the results of their activity, such as burrows and foot prints (trace fossils), and organic compounds they produce by biochemical processes (chemical fossils).