Thermosetting Adhesives
Thermosetting adhesives are essentially infusible, insoluble and show good creep
resistance. They are used for high load assemblies and severe service
conditions such as heat, cold, radiation etc.
Thermoset adhesives set as a result of the build up of molecular chains to produce a rigid crosslinked
structure. They include epoxy resins, which are some of the most widely used
adhesives. There are many different thermoset adhesives available including phenolic
formaldehyde (PF) resins, phenolic neoprene, resorcinol formaldehydes (RF), polyesters,
polyimides and epoxy resins.
Thermoset adhesives are generally more expensive,to purchase and to use, than the other
adhesive types. They are the adhesives most used for structural, load bearing
applications. Some of the toughened variants provide exceptional properties directly
comparable with welded and riveted alternatives.
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| Type |
Notes................
Material Bonded |
| Phenol PF |
Phenol Formaldehyde:used where great strength is required, durable and water resistant.
Materials Bonded ..: Wood,Wood exterier,Aluminium, Metals, Glass, PF, UF etc, Polyester, PTFE etc, |
| Resorcinol resins |
Resorcinol-formaldehde : Water resistance is very good. They are used to make exterior plywood.
Materials Bonded .. :Wood, Wood exterier,, Textiles, Brick/concrete/ceramic, PVC, Amides(nylon), Polyurethane |
| Polyesters (unsaturated) |
Usually made to harden by chemical action rather than by the evaporation of solvents
and thus cure with little shrinkage.
Materials Bonded ..: Wood joints, Metals, Glass, PF, UF, Polyester/GRP, Polystyrene, ABS ,PVC, Acrylic, Poycarbonate, Polyurethane, |
| Polyimides |
High performance adhesives requiring higher curing temperatures and bonding pressures
(up to 0.7 MPa ). High cost adhesive. Supplied as tapes.
Materials Bonded ..:Metals
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| Epoxy resins |
Epoxy (mostly 2-part) adhesives have good strength and chemical resistance, do not produce volatiles during curing, and have low shrinkage.
Therefore they form extremely strong and durable bonds with most materials in well-designed joints. Single part adhesives require heat for setting or need long setting times.
Materials Bonded ..:Wood, Wood exterier, Aluminium, Metals, Glass, Brick/concrete/ceramic, Rubber, PF, UF etc, Epoxy, Polyester,
LDPE/HDPE, PVC,ABS, Polystyrene, Polycarbonate, PVC Acrylic, Amides(nylon), Polyurethane, PTFE etc |
| Epoxy polysulphides |
Better flexibility and peel strength but relatively lower peel strength
Materials Bonded ..: Wood, Wood exterier, Aluminium, Metals, Glass, Brick/concrete/ceramic, Rubber, PF, UF etc, Epoxy, Polyester,
LDPE/HDPE, PVC,ABS, Polystyrene, Polycarbonate, PVC Acrylic, Amides(nylon), Polyurethane, PTFE etc |
| Epoxy silicones |
Good temperature characteristics
Materials Bonded ..: Metals , Laminates |
| Redux adhesive |
Trade Name.. High performance structural adhesives - Paste or film .
Formulations include 1)vinyl-phenolic - giving the best hostile environment
resistance properties.up to 70oC. ..2. epoxy - giving higher strengths, toughness and
to 200oC. 3) bismaleimide - Temperature resistance to above 220oC.
Materials Bonded ..Paper,Aluminium, Metals, Textiles,Glass, Brick/concrete/ceramic, Rubber, PF, UF etc, Epoxy, Polyester,
LDPE/HDPE, PVC,ABS, Polystyrene, Polycarbonate, PVC Acrylic, Amides(nylon), Cellulose Acetate, Polyurethane, PTFE etc, Acetal |
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