Word used to usally describe a highly viscosity adhesive made from
or flour such as rice or wheat, generally prepared by heating together a
mixture of starch and water and subsequently cooling the resulting product.
This in turn may be diluted with water to produce the required texture.
Adhesive's resistance to be stripped from a bonded joint with the stripping
force applied at a predetermined angle and rate.
(more about adhesive testing)
The amount of force required to peel a material off a substrate. Expressed in
Phenolic / Phenol Formaldehyde, PF
Made from chemicals of the phenol group and formaldehyde.
Agent which when exposed to a specific wavelength of energy forms a reactive
species which starts the chain reaction to cause polymer formation. Most
commercial photo-iniators for radical curing reactions contain benzoil groups,
which are mainly responsible for the absorption of energy from light. Aryl
sulfonium salts can generate both radical type and cationic active centers.
Syn. Photo-curing material
Fine solid particle used to colored products and substantially insoluble in the
Note: In contrast, a dye
Compounding material used to enhance the deformability of a polymeric compound.
A plasticizer is soluble in the polymer and decreases the glass transition
temperature (Tg) value, softens and adds flexibility to the product.
or PMA dispersion which requires heat to harden. The resultant joints are often
resilient and tough.
Polymer formed by the reaction of a diamine and a diacid. Nylons are commercial
polyamides characterized by toughness, solvent resistance, and sharp melting
Polychloroprene (extended definition)
Syn. Chlorobutadiene, Neoprene
Polymer in which the structural units are linked by ester grouping. See
Saturated Polyesters, SP and Unsaturated
Polymer containing ether linkages. Polyethers used in polyurethane technology contain reactive
hydroxyl end groups.
Chemical substance containing one or more hydroxyl groups. Diol, triol and tetrol contain 2,
3 and 4 hydroxyl groups respectively. Polyols are reacted with isocyanates
to make polyurethanes.
Polysulfide rubber, PSR
Mercaptan terminated, long chain aliphatic polymers containing disulfide
linkages. Can be converted to rubber at room temperature without shrinkage upon
addition of a curing agent. Used for exterior
sealant and sealed insulating glass sealant.
Diisocyanates react with diamines to yield polyureas. Reaction is very fast and results in a strong
polymer, popular for coatings applications.
Polymer made by the reaction of polyols with a multi-functional isocyanate. Its
molecular structure may cross-link and become a thermosetting plastic, or stay
linear and remain thermoplastic.
Polyurethane reaction intermediate made by reacting an isocyanate with a polyester or polyether
polyol, in which one component (usually the isocyanate) is in considerable excess of the other.
Polyvinyl acetate, PVAc
Colourless, transparent solid. Used in adhesives which are themselves also
referred to as PVA or PVA adhesives.
Polvinyl Alcohol, PVOH
Resin formed by polymerizing vinyl alcohol.
Polvinyl Chloride, PVC
Thermoplastic resin produced by the polymerization of the gas vinyl chloride
[CH2CHCl]. Used in soft, flexible films for food packing. Also used in rigid
products such as pipes.
The length of time an adhesive remains usable for mixing. Usually an important
factor with adhesives mixed together that begin curing almost immediately.
Syn. Shelf life
Enclosing and article in an envelope of adhesive. Often used in the electronic
industry to protect sensitive components.
Precipitated Calcium Carbonate, PCC
Precipitated calcium carbonate is a versatile additive for use as rheological
modifier in PVC, silicone, polysulphide and polyurethane sealants for the automotive,
construction, aerospace, appliances and other industries.
Preformed tapes are generally elastomeric rubber extruded into a ribbon of a
width and thickness suitable for specific application. Preformed tapes are usually
used in the Building and Construction market, chemically compatible to glass,
metal, or wood.
Substance added to protect, prevent, or retard decay, discoloration, or
spoilage under conditions of use or storage. (see
Pressure sensitive adhesive (PSA)
Adhesive that remains tacky after curing or setting. Firmly adheres to a
variety of dissimilar surfaces upon mere contact without the need of more than
finger or hand pressure.
Chemical material that improves the bond of the sealant to the substrate.
Compounding material that improves the processability of a polymeric compound.
: Examples of improvements attributable to processing aids include reduced
nerve, better dispersion of dry materials, increased extrusion rates, reduced
powder consumption during mixing, smoother surfaces on calendered and extruded
products and improved knitting.
Thick, mastic type material, often made from calcium carbonate and a linseed
oil, used for setting glass in wood frames, filling cracks, holes and open