Glass Packaging Institute the glass finish number. For example, an 8-425 finish is approximately 8 mm neck outside diameter with a 425 finish corresponding to a threaded neck typically found on small vials. Glass Packaging Institute The Glass Packaging Institute (GPI) is the North American trade association for the glass container industry, headquartered in Arlington, Virginia. Through GPI, glass container manufacturers advocate job preservation and industry standards, and promote sound energy, environmental, and recycling policies. The GPI membership consists of 5 glass container manufacturing member companies, and 33 supplier member companies, who provide raw materials, recycled glass, equipment, decorating, and other services to
Structure of liquids and glasses of "g" versus "r" of a liquid or glass shows a number of key features: The static structure factor, "S(q)", which can be measured with diffraction techniques, is related to its corresponding "g(r)" by Fourier transformation where "q" is the magnitude of the momentum transfer vector, and ρ is the number density of the material. Like "g(r)", the "S(q)" patterns of liquids and glasses have a number of key features: The absence of long-range order in liquids and glasses is evidenced by the absence of Bragg peaks in X-ray and neutron diffraction. For these isotropic materials, the diffraction pattern has