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Shear Strength After Solvent Immersion

The force required to separate a bond by shear force after immersion in a typical varnish solvent under designated conditions.

Shear Adhesion

The time required, under specified test conditions (surface area, weight load), to slide a standard area of pressure sensitive tape from a standard flat surface in a direction parallel to the surface.

Self-Seal

An adhesive joint that is accomplished by coating both adhered surfaces, and bringing them under pressure; an elastomeric adhesive (cohesive) used on envelope flaps, box closures, etc., whereby the adhesive film will bond only to itself.

Saturation (Impregnation)

Adding materials (saturant) to the backing for improvement of physical properties and resistance to various deleterious environments.

Rope Stock

A smooth paper made wholly or largely of hemp fiber for tensile strength.

Release Force

The measure of the force required to separate a unit width of pressure sensitive tape from a release coated surface at a controlled angle and speed. 

Release Liner (aka Slip Sheet or Interliner)

A web of sheet material used as a protective liner, which covers the adhesive side of the tape.  It is removed prior to application.  Most frequently found on double-sided tapes and label stocks.

Priming

Application of a thin layer of adhesive-like material to a backing that serves as a bonding agent between the backing and the final adhesive coat.

Pressure Sensitive

A term commonly used to designate a distinct category of adhesive tapes and adhesives which in dry form (solvent/water free) are aggressively and permanently tacky at room temperature and that firmly adhere to a variety of dissimilar surfaces upon mere contact, without the need of more than finger or hand pressure.

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Plasticization

The softening of an adhesive when exposed to migrating plasticizers or oils.

Peel Adhesion

The force per unity width required to break the bond between a pressure-sensitive adhesive tape and the surface to which it has been applied when the tape is peeled back at a controlled angle at a standard rate and condition.

Pattern Coated

A term that refers to the width and spacing arrangement of strips of adhesive laid down parallel to machine direction and across the width of pressure sensitive stock during its production.

Out-Gassing

The release of volatile components under heat or vacuum.

Opacity

The ability of a tape to prevent the transmission of light.

Oozing

A "squeezing out" of the adhesive from under the backing.   Occurrence when a tape is in a roll form causes the edges of the roll to become tacky.

Off-Core

A roll of tape in which the layers are in correct alignment, but the tape is displaced sideways on the core.

Moisture Vapor Transmission Rate

A measure of the rate of water vapor transmission through a pressure-sensitive product, usually measured in grams/square meter/24 hours.

Metal Foil

Thin flexible sheets of metal, such as aluminum, copper, and lead, used as tape backings because of their inherent properties such as weather resistance, electrical conductivity, reflectivity, etc.

Lifting

A situation where a section of tape has pulled away from the surface to which it has been applied.

Latent Stain

A stain in a surface to which tape has been applied, which does not become noticeable until some time after the tape is removed, usually after the surface has been exposed to sunlight or heat.