Page 525 - Handbook of Adhesives and Sealants

Economical, handles easily. Primers sometimes used for Good flexibility. A versatile sealant Primer system necessary High in cost. Normally re- quires primer system id
Remarks substrates in critical applica- tions. Wide range of properties. Economical, somewhat difficult to handle. Has high strength and good abrasion resistance. Excellent

Toxicity during application None None None Can affect allergic in- dividuals None None

Application methods GM, GP, K, B, S GM, GP, K, B, S GM, GP, K, B GM, GP, K, B, S GM, GP, K, B, S GM, GP, K

Pot life Two-part Chemical reaction Systems (Catalyst-cured) 1–6 hr 3–6 hr 3–6 hr 50 min 3–4 hr 1 year at 80 F

Curing time and temp range 16–24 hr at 75 F 16–24 hr at 75 F, 6 hr at 180 F 24 hr at 75 F 2hr at 75 F 24 hr at 75 F 14–21 days at 75 F

Hardening Sealants, Nonrigid (flexible) Type 1 Curing characteristics Thermosetting liquid polymer, cures at room temperature. El- evated temperature reduces cure time Thermose

TABLE 12.2 Sealant base Polysulfide ........ Polyurethane ...... Silicone ........... Modified epoxy ......... Neoprene Polysulfide ........ 454