The Glass and Glazing Federation’s standards for blemish acceptability.

Page from a publication titled 'Products, Glazing Techniques and Maintenance' focusing on visual quality standards for installed insulating glass units made from flat transparent glass, discussing surface reflections, manufacturing processes, flaws, and optical phenomena such as Brewster's fringes. Includes details about glass surface qualities, defects, and their impact on appearance, along with contact information for the Glass and Glazing Federation.