Page 330 - Handbook of Adhesives and Sealants

290 Chapter Eight

TABLE 8.3 Cure Conditions for Major Adhesives and Sealants 2
Material Cure condition
Acrylic Heat, catalyst or ultraviolet light
Acrylic, modified RT, handling str in minutes, full str
in hrs
Acrylic esters (anaerobics) 300 F (422 K) for 45 sec, 3 hr at RT
Amino resins
Melamine formaldehyde Up to 300 F (422 K)
Urea formaldehyde RT, must use catalyst
Butadiene-acrylonitrile 2 to 10 psi (0.013 to 0.069 MPa) for
24 hr
Butadiene-styrene 20 to 100 psi (0.138 to 0.69 MPa)
pressure
Butyl, sealant Long set time to achieve reg str
Cellulose ester Air dry
Chloroprene, sealant 7 to 14 days at 75 F (297 K)
Cyanoacrylates 0.5 to 5 min at RT
Epoxy 1 min to days; RT to 350 F (450 K)
depending on formulation
Ethylene-vinyl acetate Hot melt, cures on cooling
Ionomer Hot melt, cures on cooling
Phenolic Preheat 15 min at 325 F (436 K), 250
psi (1.72) MPa) and 325 F (436 K) for
15 min
Polyamide Hot melt, cures on cooling
Polyester Minutes to hours at RT
Polyimides 90 min at 550 to 700 F (561 to 644 K)
and 500 psi (3.44 MPa)
Polysulfide Moderate temp, low pressure
Polyurethane Up to 300 F (422 K), low pressure
Polyvinyl acetals Clamping for 30 min
Polyvinyl acetate & copolymers Hot melt, cures on cooling; emulsion
air dry
Polyvinyl alcohol Water activated, RT
Silicone Low pressure, RT
NOTE: Actual cure conditions may vary considerably, depending on preparation of the ad-
herend, temperature, humidity and other variables.