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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.


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


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.


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


The release of volatile components under heat or vacuum.

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.

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.


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

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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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.

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.

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. 

Rope Stock

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

Saturation (Impregnation)

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


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.

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.

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.

Single Faced

A tape to which a pressure sensitive adhesive is applied to only one side of the backing.


When the tape tears or breaks into small pieces, either on unwind or on removal from a surface.

Subsequent Adhesion

The force required to remove a unit width of pressure sensitive tape from a standard panel after it has been in contact with a release liner for a given period of time.   This must be compared with the adhesion of the same tape that has  not been in contact with the release liner to determine the degree of loss of adhesion.