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Product Catalog for Architecture & Construction 3M™ Glass Bubbles 3M™ Glass Bubbles K20 3M™ Glass Bubbles K20, 1 gal container (.5 lb, .2 kg) [click to enlarge] 3M™ Glass Bubbles K20 have a density of 0.2 g/cc and an isostatic crush strength of 500 psi. The general purpose K Series glass bubbles are the most economical 3M glass bubbles. 3M Id : 70-0704-8403-8 GTIN(UPC/EAN) : 0 00 21200 87815 2  Additional Information Learn More . . .   MSDS (Canada - en) Like all 3M glass bubbles, K20 bubbles are compatible with thermoset resins like polyurethane and epoxy, and are virtually insoluble in water. Characteristics    Density (g/cc) 0.2    Particle Size (D50, Micron) 55    Strength (MPa) 3.4    Strength (PSI) 500

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