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3. Adhesive working life ducts that are waxed or porous. Use a hot air blower and Working life or pot life is the When windy conditions exist, apply heat uniformly to bell time it takes for the adhesive to protect the adhesive from and spigot until warm (not harden in the mixing can. This flying dirt and dust. hot)to the touch(See Figure time is measured from the time Caution: If adhesive becomes 1.6.10).If torches are allowed the adhesive and hardener are warm and starts to set up in the on the job site (check local first mixed.Working life is shor- container, discard immediately. codes), use a clean-burning ter at temperatures above 70° F DO NOT USE THIS ADHESIVE propane torch.Check temp- (21° C)and becomes longer as TO BOND A JOINT! erature by touching outside the temperature drops below of the bell and inside of the 70° F (21° Q. Working life is When adhesive is allowed to spigot to avoid contact with affected by the quantity of set up in the metal container, clean bonding surfaces. If mixed adhesive as well as by the container may reach hot to the touch, let cool temperature. Use the following approximately 400° F (205* Q. before applying adhesive. If methods to increase the work- Do not handle hot containers an electric heating collar is ing life of adhesives: without heavy gloves.This exo- used to prewarm, place the thermic reaction will generate a joint together dry,then heat a. Occasionally stir the adhesive dense smoke;therefore,the con- the O.D. of the bell to avoid mixture during application. tainer should be placed outdoors contaminating the spigot. b. Cut the carton in which the in an open area until it cools. CAUTION: Do not use adhesive kit is furnished so 1.6.4 joint assembly chemical heat packs for that the height of the carton prewarming. is the same as the adhesive 1. Bell and Spigot joint - THE b. Brush adhesive on both can.Line the inside of the box SPIGOT MUST BE ALIGNED surfaces, applying a thin with rags or paper towels,and AND LOCKED IN THE BELL.A uniform coating(See Figure wet the rags or towels with cocked or misaligned joint will 1.6.11). Adhesive should joint cleaner. Nest the can in result in false lock up and pos- 1 prepared carton (See Figure sible joint failure either during 1.6.9).Do not contaminate the testing or at a later date. adhesive with joint cleaner. a. When the temperature is I c. Working life in hot weather below 70°F (21 'C), pre- can also be extended by warm the bonding surfaces spreading the mixed adhesive (after the joint has been out into a film.Pour the adhe- cleaned and the cleaner has sive mix out of the can and evaporated). Caution: Evap- spread it out on a clean piece oration may be slow at of foil. Never use paper pro- extremely low temperatures. Figure 1.6.s BLOW DRYER 1 ` BELL SPIGOT END END Figure 1.6.10 Figure 1.6.11 12