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A bond produced between a pressure sensitive adhesive and a surface.
Any material that will hold two objects together by surface contact.
Adhesive Residue
Adhesive that pulls away from the carrier and remains on the surface to which it was applied. Photodon screen protectors will Not leave adhesive residue.
Reducing or preventing glare.


Blue Light
Blue light is a color in the visible light spectrum that can be seen by human eyes. Blue light is a short wavelength, which means it produces higher amounts of energy.


Separating into layers.


Finger Lift
Liner or tab extending past the edge, providing an easy liner removal. Usually referred to as tabs.


Surface shine. High gloss screens deliver the best screen image as there is no obstration of the image.
Ability to reflect an image - light is reflected off the surface back to the viewer. This can be a distraction and cause eye fatigue. This can be overcome by using an anti-glare screen protector.


H or Hardness value
Hardness measure of resistance deformation or abrasion.
H-scale relates to the pencil hardness scale, higher numbers being hardest.

See also: Anti-Glare


A combination of two or more similar or dissimilar materials that function as one.


Peel Adhesion
The force per unit required to break the bond between a film and a surface when peeled back; usually at 180 degrees at a standard rate and condition.
(PET) Polyethylene terephthalate
PET is a clear, strong, lightweight form of polyester and is highly recyclable. However, it is not biodegradable. Most Photodon screen protectors are made from PET material.
Pressure Sensitive Adhesive
Pressure Sensitive
Term commonly used in reference to adhesive materials that require pressure by hand, roller, or machine to bond to a surface.


Release Liner
Most of Photodon materials have protective liners on both the top and bottom surfaces. The back liner covers the adhesive side and is removed prior to application. The top liner is normally removed after application, but can be removed prior to application in some instances if preferred.


Shock Resistance
The ability of a material to absorb shock. This is accomplished by laminating a special layer of material to the screen protector. Anti-shock screen protectors are slightly thicker.
A unique polymer used on most screen protectors as a pressure sensitive adhesive. This adhesive is capable of multiple re-applications, is washable if needed and functions effectively at extreme temperatures.
Surface Energy
The measure of surface tension in dynes. The lower the surface energy of a substrate the more difficult for an adhesive to bond to that surface.


See also: Finger Lift
The ability of a material to adhere instantaneously to a solid surface when brought into contact by a very light pressure.
Distance from one surface to the other usually expressed in millimeters, or thousandths of an inch. This is usually measured under slight pressure with a special gauge.
Thermoplastic polyurethane (TPU) is any of a class of polyurethane plastics with many properties, including elasticity, transparency, and resistance to oil, grease and abrasion. TPU screen protectors are usually thin, have high adhesion and work well on curved surfaces.
The ability of a material to allow transmission of light.
The ratio of the light energy falling on a body to that transmitted through it. Usually expressed as a percentage.
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