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.


  • Deburring
    The process of removing rough edge deformations caused by cutting and/or drilling dielectric supports for printed circuits.
  • Deca (deka)
    A prefix utilized in the metric system of measurement that denotes 10 to the power of one (101); symbol is da.
  • Decal (deca)
    An abbreviated form of decalcomania, the French designation of a design printed on specially prepared paper for transfer to a substrate. Also see cement-type decal, duplex decal, heat release decal, simplex decal, varnish-on decal, water slide decal, decalcomania.
  • Decal adhesive
    A clear, screen printable, water soluble compound printed over the face surface of decal for face-down adhesion on a transparent substrate for viewing through the substrate.
  • Decal varnish
    A specially formulated fast-setting varnish used for adhering certain types of decals usually intended for outdoor exposure.
  • Decalcomania (decal)
    An abbreviated form of decalcomania, the French designation of a design printed on specially prepared paper for transfer to a substrate.
  • Decalcomania paper
    A specially coated absorbent paper made of cotton fiber mixed with chemical wood pulp, having a smooth, uniform finish and with a good wet strength and finished as a simplex or duplex decal paper.
  • Decant
    To remove liquid and leave the solids behind in a liquid slurry.
  • Deci
    A prefix utilized in the metric system of measurement that denotes 10 to the negative 1 power (10-1) or 0.1; symbol is d.
  • Decibel (dB, db)
    The logarithmic acoustical unit scale used for expressing transmission gains, losses, and levels, and for measuring relative intensity of sound.
  • Deckle
    Papermaking, the width of the wet sheet as it comes off the wire of a paper machine.
  • Deckle edge
    The untrimmed, feature edge of a sheet of paper formed when the pulp flows and sets against the deckle or is formed by a jet of water or air against the edge during paper making. (Deckle-edged papers are often used in fine art printing).
  • Decoating
    Refer to reclaiming.
  • Decolorization
    A material added in small amount to a glass batch to counteract the effects of iron or other contaminating element.
  • Decomposition
    The breaking down or separation of a substance.
  • Decorated
    To embellish, adorn, mark, and/or make more attractive aesthetically or functionally.
  • Dedicated circuit
    An independent electrical connection devoted to a special purpose.
  • Deep line cut
    A method of cutting overlays so that trapping is improved.
  • Deep well exposing unit
    A table or bench mounted unit equipped with a flexible, transparent top instead of glass which can be molded around a direct printing screen by vacuum for exposing.
  • Definition old
    (1) Image sharpness, resolution, fidelity or clarity of detail; (2) A subjective measure of the overall quality, resolution, and acutance of a printed shape against the substrate or background.
  • Deflection gauge
    Refer to tensionmeter.
  • Deflection temperature
    Temperature at which a standard test bar deflects 0.25 mm (0.010 in) under stated load of either 0.45 MPa (66 psi) or 1.82 MPa (264 psi).
  • Deflocculant
    An agent for dispersing a suspension of ingredients in a vehicle to lower viscosity and to inhibit settling.
  • Defoamer
    An additive that eliminates entrapped air bubbles from ink or base being mixed.
  • Defocused system
    In UV curing, locating the substrate at a point other than the focal point of the lamp, to initiate curing.