WIKO Adhesive Competence Center
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P 21 Posts in this encyclopedia category

Passive materials

Passive materials are materials that form a natural protective layer (passivation layer) on their surface, protecting them from chemical or electrochemical degradation.

peel loading

Peel loading refers to a force acting in only one line of the bonded joint.

Peel strength

Peel strength refers to the load value required to separate bonded mating parts in a peeling motion.


Pigments are often used to create colors because they allow the desired color spectrum to be created.


In adhesive technology, plasma is used to activate a non-polar adhesive surface (component surface).

plastically deformable

Plastically deformable means that a material can permanently change shape under stress or deformation without breaking or cracking.


In adhesive bonding technology, the interaction of plasticisers in the plastic with the adhesive and vice versa must be taken into account in order to prevent brittleness or failure.


Plastics are synthetic or semi-synthetic polymers made from organic compounds. They have a variety of properties such as light weight, malleability and resistance to chemical attack.


Polycondensation refers to a type of reaction where two molecules react to form a larger molecule and a smaller molecule such as water, ect. is released.


A polyol is a chemical compound with multiple functional groups that is often used in the manufacture of polyurethanes. 

polyurethane adhesives

Polyurethane adhesives are adhesives based on polyurethane and have high tensile strength and shear strength. 


Post-crosslinking is a process in which polymer structures that are already crosslinked are linked together by further chemical reactions. 

Pot time

Pot time refers to the amount of time a two-part adhesive or other two-part material can be used after mixing before it becomes too hard. 


A prepolymer is a chemical compound that consists of a polyol and an isocyanate component and is not yet fully crosslinked. 

Primary packaging

The primary packaging is the packaging that is in direct contact with the product. According to the CLP Regulation, the contents must be labelled on the primary packaging.


A primer is a chemical substance used to improve adhesion between two different materials. 

process material

Adhesives are typical process materials because they develop their mechanical strength only through a setting reaction during manufacture.

processing temperature

Processing temperature refers to the ideal temperature at which an adhesive should be processed to achieve the quality of the cured adhesive. 

processing time

Processing time refers to the amount of time a two-component adhesive or other two-component material can be worked after mixing before it becomes too hard.

Process material

Adhesives are typical process materials because they develop their mechanical strength only through a setting reaction during manufacture.


PUR or PU stands for Polyurethane, a versatile plastic used in many applications including foams, adhesives, coatings and fibers. 
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