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D ing collars that reach lower tem- peratures or have different time vs. temperature curves may re- sult in improper cure of bond. Therefore, it is recommended that only heating collars from Smith Fiberglass Products be used. d. CAUTION: Allow the heated joint to cool until it is comfort- able to the touch before any stress is applied to the joint. Avoid bending or pulling at heat assist temperatures. Normal lifting to remove the heat assist equipment will not harm the joint. Any stresses on the pipe due to bending or sagging should be relieved prior to heat cure. Pipe or subassemblies can be moved before the joints are cured as long as care is taken that the lock-up of the joint is not disturbed. Bending or ex- cessive movement is not ad- vised. If a generator is used, be sure that it will furnish enough power to supply al I of the units being used. Use 110/120 volt A.C. only. When extension cords are used, make certain they can handle the total wattage of the collars being used. See Section 3, Tables 1.3.1 and 1.3.2. 2. Curing fitting joints When using Smith Fiberglass Prod- ucts heating collars that fasten with straps and/or snaps, the general pro- cedure for curing adhesive -bonded, in-line (thin wall) fitting joints (such as couplings and threaded adapters) is the same as that for curing pipe joints. However, because of the outside diameter size difference be- tween pipe and standard (thick wall) fittings, take the following steps: a. Place the heating collar so that as much of the bonding area as pos- sible is covered (See Figure 1.6.19). b. If the heating col larwill not close, tie a string or wire around the TABLE 1.6.3 ADHESIVE CURE TIMES WHEN USING ELECTRIC HEATING COLLARS Pipe Size (in.) (mm) Minimum Cure Time When Using DS -7000, DS -8000 or DS -4000 Series Adhesives Pipe "' Fittings 2 50 10 minutes 20 minutes 3 75 10 minutes 20 minutes 4 100 10 minutes 20 minutes To calculate adhesive cure time when using electric heating collars on sleeve couplings and threaded adapters, use Pipe column. 17 collar to hold it in place. c. Halfway through the cure time, rotate the heating collar 180 degrees to assure complete cov- erage of the bonding area. d. Note: The next larger size heat- ing collar can be used to cure thick wall fitting joints (such as elbowsand tees). When a larger size is used, the heating collar does not have to be rotated, but thecure time remainsas shown. 3. Curing flange joints Flange joints may be heat cured by reversing the heating collar and placing it inside the assembled joint (See Figure 1.6.20). Use the paper towels provided in the adhesive kit to remove excess adhesive from theend of the spigot (inside the joint). Remove most of the adhesive from the inside of the flange by wiping with dry paper towels. Use paper towels wetted Figure 1.6.20