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Glossary

A

Abrasion Resistance
The ability of a coating to resist degradation due to mechanical wear.

Adhesion
The degree of attachment, between a lining film and the underlying material to which it is in contact (substrate).

Aromatic
An organic substance, usually containing one or more benzene ring structures. In some substances, typical "aromatic" chemical properties are also conferred by other ring structures.

C

Cast, Casting
The filling of essentially open molds with liquid mixtures of polyurethane reactants or liquid monomers and allowing them to polymerize. A CPU is a cast polyurethane.

Coat
The lining/coating applied to a surface in a single application to form a film when dry.

Component
When applied to polyurethane manufacture, a component is one of at least two reactive materials that are mixed together to form a polymer.
Corrosion
The decay, oxidation or deterioration of a substance (steel, concrete and others) due to interaction with the environment.

Cross-linking
Formation of bridges between different polymer chains.
Cure
Refers to the completeness of chemical reaction processes.

D

Dew Point
The temperature of a surface at a given ambient temperature and relative humidity at which condensation of moisture will occur.

E

Elastomer
A synthetic rubber-like material capable of rapid, reversible extension.

F

Filler
An inert material added to a polyurethane reaction mixture. Fillers are usually solid, particulate materials such as glass or silica.

Fire Retardant
An added substance that inhibits the initiation and/or spread of fire.
Flexibility
The degree at which a coating is able to conform, to movement or deformation of its supporting surface giving rise to a color change.


I

Impact Resistance
The ability to resist deformation or cracking due to a forceful blow.
Isocyanate
A substance containing an isocyanate (-N-C-O) group. A polyisocyanate contains more than one isocyanate group.

M

MDI
An abbreviation for 4,4'-diphenylmethane diisocyanate and 4,4'-diisocyanate diphenylmethane.
Monomer
A substance that is capable of conversion into a polymer.


P

Polyether
A polymer containing ether linkages. The polyethers used in polyurethane technology contain reactive hydroxyl end groups.
Polymer
A high molecular weight substance, natural or synthetic, which can be represented as a repeated small unit (monomer).
Polyol
A substance containing several hydroxyl groups. A diol, triol and tetrol contain two, three and four hydroxyl groups respectively.

Polyurethane
Polymeric substance containing many urethane linkages.
Prepolymer
A polyurethane reaction intermediate made by reacting isocyanate with a polyester or polyether in which one component is in considerable excess of the other.
Primer
The first coat of paint applied to a surface, formulated to have good bonding, wetting and inhibiting properties.

R

Reaction
A chemical change in which two or more atoms or molecules give a new substance.
Relative Humidity
The ratio, expressed as a percent of the quantity of water vapor actually present in the air to the greatest amount possible at a given temperature.


S

Stabilizer
An additive that tends to keep a substance from changing its form or chemical nature. Stabilizers may protect against hydrolysis, oxidation, light, etc. (i.e. ultra-violet inhibitors).

Substrate
The surface to be coated.

T

TDI
An abbreviation for toluene diisocyanate.

U

Urethane
The chemical group (-N-C-O).

V

Viscosity
A measure of fluidity of a liquid.
Volatile Organic Compounds (VOC)
A measure of the total amount of organic compounds evaporating from a coating film, excluding water.



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