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0 0 _ 7Bonding primary The table indicates the adhesive pot life under various temperature conditions.1, systems(cont.) weather,pot life maybe extended by wrapping a damp rag around the can of mr adhesive or by spreading the adhesive on aluminum foil to dissipate the heat. Pot life/cure times for Ameron B20 adhesive • Minimum Ambient Adhesive Minimum Joint Temperature Pot Life Cure Time` (°F) (°C) (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 be 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' Temperatures may be lower I during the entire period of cure,an external heat source must be used to force c 1 than ambient in a trench or I adhesive.The adhesive and the bonding surfaces should be warmed to 50°F(1( out of direct sunlight. I before mixing and applying the adhesive. Below 40°F(5°C)force 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 L • Hot air gun Using Chem Cure Pak with Ameron B20 adhesive The Chem Cure Pak is a self-contained,nonelectrical heat source for curing adh In bonded joints.Instructions are printed on the Pak wrapper.The Pak is designed sufficient heat is generated to cure Ameron B20 adhesive in one hour at ambien temperatures as low as 0°F(-18°C).The Chem Cure Pak is manufactured in diff( sizes corresponding to the diameter of the piping being installed.Use the conec 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 stean For lower temperatures or when installing extra-heavy fittings,consult Ameron f r-------------I specific recommendations. Chem Cure Pak contains oxalic I • Assemble pipe and fittings using standard field installation procedures. acid.Harmful if swallowed.Causes I . Mix the chemicals thoroughly as directed on the Pak wrapper. skin and eye irritation. I Wrap the Pak around the connections,centering it over the tapered sectic L____________J the joint,not over the end of the fitting.Cover the entire bonding area to w adhesive has been applied.Refer to Fig.7-1. • Use one Pak per bond:sleeve couplings in 3-inch sizes and larger require Activator Paks.However,a single Pak is sufficient for curing both bonds in a 2-inch 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. R • Inject water into the slits with the activator syringe or pour in a small amou newnes \ acup. Center Pak over • Aluminum foil may be wrapped directly over the joint to prevent the Pak fn tapered area sticking if it is necessary that the expended Pak be removed from the tren Fig.7-1.The Chem Cure Pakshould Follow the precautions printed on the Chem Cure Pak wrapper: produce steam in about30 seconds after injecting water.Ifno reaction occurs, • Do not get ingredients on skin,in eyes,or on clothing. discard the Pak and use another one. • Do not breathe dust or vapor. • Use only outdoors where adequate ventilation is provided. • Do not take internally. • Keep out of reach of children. 10