Whole window SHGC is lower than glass-only SHGC, and is generally below 0.8. Solar heat gain can provide free heat in the winter but can also lead to overheating in the summer. How to best balance solar heat gain with an appropriate SHGC depends upon the climate, orientation, shading conditions and other factors.
Eakle, A.S. (1929), Probertite, a new borate, American Mineralogist: 14: 427-430. Schaller (1929) USGS Professional Paper 158: 137. Foshag (1931) American Mineralogist: 16: 338. Barnes (1949) American Mineralogist: 34: 19, 611. Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II.
Well, it isnât made from virgin limestone, but Ambient Glow Technology (AGT) products from Universal One Corp., Toronto, do achieve that elusive quality of luminescence. The companyâs glow-in-the-dark aggregate is indeed something different to behold. AGT is a high-performance, non-toxic, photoluminescent aggregate specially formulated and manufactured for the decorative concrete, cement, terrazzo, stucco and floor epoxy trades. AGT is produced in 3 different meshes of sand, 1/4-in.