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S JOINT PREP Cleaning the Bonding Surfaces Bonding surfaces must be cleaned before bonding. Do not touch the bonding surfaces or allow them to become contami- nated after they are cleaned. Acceptable cleaning methods are as follows: Sand all bonding sur- faces with 60-80 grit Emery cloth (sandpa- per) until contamination is removed. The sanding operation must be light enough to prevent changing the ta- per angle. X_ )IL Cut off contaminated surface and replace with a new taper or sleeve coupling. Wire brushes may be used for cleaning T.A.B. surfaces; however, they must be clean and free of oil contamina- tion. Clean solvent (fresh) may be used if preferred by the cus- tomer. Some typical cleaning solvents available are ac- etone, methylene chloride, and methyl ethyl ketone. After cleaning, be sure any residual solvent has evaporated before applying adhesive. Do not use solvents that leave an oily film on the bonding surfaces. Warning: Some degreasers and solvents are extremely flam- mable. Never use gasoline, turpentine, or diesel fuel to clean joints. All solvent should be evaporated. Read warning labels on containers before applying solvents. Reworking Weathered Surfaces (UV Degradation) Pipe stored out-of-doors for extended periods of time may as- sume a chalky appearance. This change in appearance is su- perficial and does not affect the pipes performance. However, when machined or sandblasted surfaces of pipe and fittings are exposed to direct sunlight for a prolonged period of time, the result could be a loss of bond strength. All pre -prepared surfaces that have turned yellow or brown in color must be reworked. For exposed T.A.B. ends, cut 1Y (12.7 mm) mini- mum off of the end of the spigot and re -taper. Exposed fitting 17 R""F7 �"R'�er it".: i 11 Buil ENVIRONMENTAL HEALTH DEPARTMENT