PENETRATION RESISTANCE:
Tapes ability to withstand high pressure on small areas without puncturing.

PERMEABILITY:
The ease that a liquid or gas can pass through a tape or film.

PHENOLIC RESIN:
Family of resins derived from phenol and frequently used as curing agents in adhesives to impart high temperature resistance and hold.

PIN HOLE:
Small defect in the mass or backing that may permit the passage or light or electricity.

PIGTAILING:
Tapes spiraling when unwound due to uneven stress in the backing.

PLASTICISER:
A liquid or semi-liquid incorporated into a material increasing its flexibility and workability.

PLASTICISER MIGRATION:
Specific plasticisers used in producing plastic sheeting or forms pass from the plastic into the pressure-sensitive adhesive of the applied tape. Resulting in a softening of the adhesive to the point of adhesion failure and a slight embrittlement of the adjoining plastic.

POLYBUTADIENE:
A polymeric material generally soft and rubbery, very tough and elastic. It is made from butadiene monomer.

POLYESTER:
A tough strong film. It has good resistance to moisture, solvent, oil and temperatures.

POLYETHYLENE:
A polyolefin plastic that can be extruded into a low tensile film. It has good moisture barrier properties but a limited resistance to temperature.

POLYIMIDE:
A polymer that in film form is amber-colored, with physical properties similar to polyester but with a much higher temperature resistance.

POLYISOPRENE:
A polymeric synthetic rubber material made from isoprene monomer with similar properties to natural rubber.

POLYMER:
A large molecular chain made up of repeating monomer units.

POLYMERISATION:
Chemically linking monomer molecules to form a chain polymer.

POLYPROPYLENE:
A polyolefin plastic similar to polyethylene in properties, with higher temperature capability and greater strength.

POLYURETHANE:
A tough abrasion-resistant polymer that can be extruded into film and other forms.

POLYTETRAFLUOROETHYLENE:
A fluorinated plastic characterised by temperature resistance and an inherent release surface. Shaving a billet of material with a sharp broad knife producing a continuous web makes a skived film.

POLYVINYLCHLORIDE/PVC:
A synthetic plastic used mostly as a tape backing, either with plasticiser added or not, making the tape flexible or rigid.

POLYVINYLFLUORIDE:
A fluorine containing film, good flame resistance, weathering resistance and good electric properties.

POLYVINYLACETATE:
Frequently used plastic as a coating for paper or as an adhesive for laminating webs.

PRESSURE-SENSITIVE:
Materials that adhere by application only without help by heat or solvent.

PRIMER:
A preliminary coating applied to the backing enabling the adhesive to stick to the backing.

PRINT COATER UNIT:
A unit consisting of two rolls of gravure printing unit and a gas fired vertical high-velocity air drying oven.

PRINTABILITY:
Tapes ability to accept ink without destroying the printed legend when unwound.

PROGRAM WIND:
Device used to automatically changed winding tension as rolls of tape are being wound.

PUCKERS:
Distortions in web materials associated with laminated or interlined products. Puckers appear as ripples on the surface and often show separation of the two laminated components. They generally run in the cross machine direction.