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A simple and effective way to test the safety of fume hood exhaust before use. Just a squeeze or two from the plastic bottle dispenses a cloud of ultra-fine, lightweight silica powder, which remains suspended long enough to visually check whether or not the fume hood exhaust is functioning properly. It is also useful for detecting drafts, gas leaks, and air currents in rooms, ducts, and exhaust systems. The amorphous silica powder is inert, non-hazardous, and non-flammable. 1.5 gm bottle. Per Each. SP Scienceware a division of SP Industries is home to Bel-Art and H-B Instrument brand products. Each brand has a proud heritage in the laboratory supply market and manufactures state-of-the-art laboratory equipment and biological drug manufacturing solutions that include market leading brands Genevac, Virtis, Hull, FTS systems and National-Hotpack. As part of a larger organization committed to science we look forward to increased opportunities to serve our customers and remain committed to developing, manufacturing and delivering innovative products, right in value. We appreciate your business and thank you for the opportunity you have given us.