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Product Catalog for Architecture & Construction 3M™ Glass Bubbles 3M™ Glass Bubbles K37 3M™ Glass Bubbles K37, 4 ft semi-bulk bag K37 glass bubbles have a density of 0.37 g/cc and an isostatic crush strength of 3000 psi. The general purpose K Series glass bubbles are the most economical 3M glass bubbles. 3M Id : 70-0704-5814-9 GTIN(UPC/EAN) : 0 00 21200 87323 2  Additional Information Learn More . . .   MSDS (Canada - en) Characteristics    Density (g/cc) 0.37    Particle Size (D50, Micron) 45    Strength (MPa) 20.6    Strength (PSI) 3,000

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