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itions.In ho Bonding primary The table indicates the adhesive pot life 1-11111:311916us tempa�Qnde the Bonn of m zedt systems (Cont.) weather,pot life may be extended by wrapping a damp rag adhesive or by spreading the adhesive on aluminum foil to dissipate the heat. �r Pot life/cure times for Ameron B20 adhesive Minimum Ambient Adhesive Minimum Joint Temperature Pot Life Cure Time' (minutes) (hours) 40 5 70 12 65 18 40 5 75 24 30 4 95 35 20 3 Cumulative totals.Cure time at listed temperatures need not he uninterrupted,but total time must equal the tabulated time before the system is pressure tested. Force curing adhesive r—1 At temperatures below 40°F(5°C)or if the temperature will not be above 40°F(5°C) Temperatures may be lower during the entire period of cure,an external heat source must be used to force cure the than ambient in a trench or adhesive.The adhesive and the bonding surfaces should be warmed to 50°F(10°C) out of direct sunlight. before mixing and applying the adhesive. -- —� L--- ——!'— Below 40°F(5°C)farce cure the adhesive with an external heat source such as: • Chem Cure Pak(US Pat.No.3,475,239) • Ameron heating blanket sufficiently large to cover the joint • Forced air heater if the trench is covered to contain the heat • Hot air gun Using Chem Cure Pak with Ameron B20 adhesive The Chem Cure Pak is a self-contained,nonelectrical heat source for curing adhesive- bonded joints.Instructions are printed on the Pak wrapper.The Pak is designed so that sufficient heat'is generated to cure Ameron B20 adhesive in one hour at ambient temperatures as low as 0°F(-18'C).The Chem Cure Pak is manufactured in different sizes corresponding to the diameter of the piping being installed.Use the correct size Pak for your installation.Refer to table on page 11 when ordering. In cold weather,wrap insulation around the Pak as soon as it has stopped steaming. For lower temperatures or when installing extra-heavy fittings,consult Ameron for —————– specific recommendations. Chem Cure Pak contains oxalic Assemble pipe and fittings using standard field installation procedures. acid.Harmful if swallowed.Causes 0 Mix the chemicals thoroughly as directed on the Pak wrapper- skin and eye irritation. E • Wrap the Pak around the connections,centering it over the tapered section of L————————————J the joint,not over the end of the fitting.Cover the entire bonding area to which adhesive has been applied.Refer to Fig.7-1. • Use one Pak per bond:sleeve couplings in 3-inch sizes and larger require two Activator Paks.However,a single Pak is sufficient for curing both bonds in a 2-inch sleeve 1-in slot syringe Coupling. • Secure the Pak with tie wires. • Cut slits at least 1 inch wide(25 mm)on either side of the Pak. • Inject water into the slits with the activator syringe or pour in a small amount from +� a cup. Tie wiresCenter Pak over Aluminum fait may be wrapped directly over the joint to prevent the Pak from tapered area sticking if it is necessary that the expended Pak be removed from the trench. Fig.7-1.The Chem Cure Pak should Follow the precautions printed on the Chem Cure Pak wrapper: produce steam in about 30 seconds atter Do not get ingredients on skin,in eyes,or on clothing. injecting water.ffno reaction occurs, Do not breathe dust or vapor. discard the Pak and use anotherone. • Use only outdoors where adequate ventilation is provided. • Qo not take internally. • Keep out of reach of children. 10