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SPHERIGLASS® Solid Glass Spheres SPHERIGLASS® solid glass spheres are microspheres with a density of 2.5 g/cc. The spheres are very strong, with a crush strength in excess of 30,000 psi. Moh’s hardness is 6.0-6.5. Glass spheres have very low oil absorption, about 18 g oil/100 g spheres. Because the spheres are nonporous, they do not absorb resin in a polymer system. SPHERIGLASS® spheres are available in two glass compositions: A-glass (soda-lime glass) and E-glass (borosilicate glass). In most thermoset and thermoplastic resin systems, A-glass is satisfactory. E-glass is recommended for use with polycarbonate, acetal, and PTFE systems or other alkali-sensitive resins. SPHERIGLASS® spheres are available with coupling-agent coatings. Use of coated spheres is recommended when better adhesion between glass and resin is needed. Please contact Potters for a recommendation. Specifications: A Glass E Glass |
