Glossary Of Terms

The SGIA Glossary of Terms serves as an excellent industry terminology resource. It is the language by which we all communicate, without it universal understanding would be impossible. Language and our ideas about how it is interpreted change rapidly. SGIA is aware of this and continues its effort to keep our constituents well informed about changes to the increasingly complex industry terminology. The definitions are for general reference only. Usage may vary between companies, individuals, or national and country customs. The information presented is as accurate as the authors and editors can ascertain and SGIA assumes no responsibility for the use of information presented herein.


  • Glass colors
    Colored glass flux or enamel used to decorate glass.
  • Glass etch
    Any of several compounds that permit the frosting of glass by acid based screen printing directly on the ware.
  • Glass transition temperature (Tg)
    Midpoint of the temperature range over which a material undergoes a phase change from brittle to rubbery or vice versa.
  • Glassine
    A class of smooth, lightweight, dense paper that is usually semi-transparent and coated on one or more faces with silicon or similar agent that inhibits adhesion to another surface; once used as a stencil material.
  • Glaze
    A vitreous mixture of complex borates and silicates, either colored or clear, that attaches itself firmly to the body of ceramic ware, imparting a gloss and smoothness to the surface.
  • Glazed paper
    Paper with a high gloss or polish.
  • Glitch
    Minor unexpected malfunction, mishap, or technical problem.
  • Glitter
    Small bits of light reflecting decorative material added to a material or ink to achieve a sparkle appearance in the final product or print.
  • Glitter die-cut transfer
    A heat seal transfer with a metallic luster that adds sparkling brilliance to garments; may be applied to cotton and cotton blends.
  • Glory hole
    An opening in a furnace for the purpose of reheating glass during hand fabrication.
  • Gloss
    The relative degree of shine or luster of a substrate or material, the higher the light reflectance from the surface, the more shiny the substrate.
  • Gloss ink
    An ink that dries with minimum penetration into the substrate surface and that yields a high shine or luster.
  • Glossary of Terms
    Definitions of specialty imaging technical terms.
  • Glossmeter
    An instrument used to measure the specular reflectance of light from a surface of a material at a given angle.
  • Glossy print
    A photographic print that has a shining finish.
  • Glost
    Glazed ceramic ware.
  • Glost kiln
    Kiln for firing glaze on ceramics.
  • Glue pot
    A heated receptacle used to melt thermo material prior to use.
  • Glue screen
    A printing screen for the application of adhesives.
  • Glueability tester
    Instrument used to test the strength of a bond formed between an adhesive and a material, by mechanically separating them until the adhesive bond breaks, with measurement readings in pounds of glueability.
  • Gluing machine
    A mechanical device for applying adhesive to a substrate.
  • Glycerin
    An odor-less, colorless liquid C3H5(OH)3 of the alcohol class used as a solvent in the manufacture of alkyd resins and ester gum type inks.
  • Glycol
    Alcohol containing two hydroxyl (-OH) groups.
  • Glycol ether
    A chemical family of solvents, some of which have been used in screen printing ink formulations; includes 2-methoxyethanol, 2-ethoxyethanol, and their acetates that are now restricted in US due to toxicity.
  • Gob
    A glob of molten glass delivered to a mold for forming.