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Specialty Graphic Imaging Association
SGIA Glossary

Definition Glossary

Sixth Edition

Language and our ideas about how it is interpreted change rapidly. The Specialty Graphic Imaging Association (SGIA) is aware of this and continues its effort to keep our constituents well informed about changes to the increasingly complex industry terminology. This publication represents the most recent changes.

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A shortened term for electrostatic.

earth colors

Pigments such as ochre, Venetian red, Indian red, the siemans, or umber all made from various ores and oxides found in the earth.


Glazed or unglazed porous non-vitreous ceramic whiteware.


The attaching of easels to displays.

easy release

A condition where the proper combination of adhesive product and liner or backing paper facilitates separation of the face sheet from the backing such as when neutralized, reflective, or laminated sheets are involved.

edge acutance

The edge sharpness of the printed image, controlled by the screen stencil, screen tension, ink thixotropy, and related factors.

edge curl

The tendency of a pressure sensitive sheet to deform or bend away from the surface to which it has been adhered.

edge definition

The sharpness and integrity of the image edge lines or data compared to the original represented on the film.

edge sealer

A material designed to provide additional security and durability after application of a pressure sensitive product to a substrate.


The size of a print run, particularly of fine-art prints or serigraphs, where the number of prints is limited, and each print is generally signed by the artist.

effective resolution

The final appearance of a scan that has been enhanced to produce more data than the scanner can record. This is done by interpolation.


To dry or crystallize into a white powder.


(1) Waste material treated or untreated in liquid form; (2) The release of pollutants into a waterway.

Efflux cup

A simple viscometer such as a Zahn cup or Shell cup used to measure viscosity by the number of seconds required for the cup to empty through an orifice of known size.

EGA resolution

Computer monitor resolution, which is typically 660 x 440 data (pixels) for the entire screen.


(1) A slight gloss surface resembling an egg shell in color and texture; pale yellow to yellowish white; (2) A very thin translucent porcelain.

eight sheet

A poster made up of eight individual sheets measuring 153 x 203 cm (60 x 80 in).

ejector pin (knockout pin)

A device for knocking a cured plastic part from a mold.

EL lamp

A thin 0.0103 to 6.35 mm (0.010 to 0.25 inches) illuminating device used to light large areas in liquid crystal displays, control panels and membrane switch backlighting.


The original name for Spandex™; term used in Europe.

elastic elongation (elastic memory)

The stretching of a material and yet it retains the ability to return to its original length.

elastic limit

The maximum stress a material is capable of sustaining without any permanent change remaining after the stress is released.


The capability of a material to recover its original shape and size after it has been stretched or altered.

elasticity reserve

The extra resilience in a tautly stretched screen mesh that permits its conformance to moderate curvature in the substrate.


A material at room temperature that can be stretched repeatedly to at least twice its original length and upon immediate release of the stress will return with force to its original length.

electroformed printing screen

The direct conversion of electrical energy into light, through the use of a capacitive sandwich that includes a transparent conductive coating, a phosphor layer, and an opaque conductive layer, separated by a dielectric film.

electroluminescence (EL)

The direct conversion of electrical energy into light by solid phosphor subjected to an alternating electrical field.


(1) A non-metallic substance, when in solution or fused, is capable of conducting electric current; (2) Chemicals (soda and silicate of soda) used to make slip more fluid for casting.

electromagnetic spectrum

The complete range of wavelengths and frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves including visible light.

electron beam

A continuous stream of electrons used to cure or crosslink reactive inks and coatings.

electronic dot generation (EDG)

Process used in digital halftone production that allows negatives or plates to be generated by grouping micro dots into regular groups to function in the same manner as a photographically produced halftone.


A process of depositing metal particles onto a conductive surface by electrolytic action.

electroscopic ink

Finely ground, spherically shaped, dry particles of resin and coloring matter that take a static charge from the metal screen and are thus attracted through the openings in the stencil that forms the design to the grounded back plate.

electrostatic decorating

A method of decorating an article utilizing the phenomenon of opposite electrically-charged particles attracting each other such as flock or ink particles applied to a substrate by positively charging the particles and negatively charging the substrate.

electrostatic film

A PVC plastic sheet that has been electrostatically charged so that it "clings" to any highly polished surface without adhesive, offering easy removal and reuse capability.

electrostatic flocking

A process using an electrostatic charge to drive flock fibers into an adhesive that has been printed on a substrate.