Operator Technique; Application; Temperature; Section 12: Ratios And Output - DuPont FROTH-PAK Manual

Section 11
Yield Notes
Board foot yields are based on the free rise of the total weight
of the chemicals in the tanks . Many factors affect the yield in
field applications .

11.1 Operator Technique

For best results, apply multiple layers of foam . When
spraying, apply one-quarter to one-half inch thickness of
uncured foam . This will produce a one to one-and-one-half
inch thickness of fully cured foam .

11.2 Application

Avoid spraying over rising foam .

11.3 Temperature

To ensure proper chemical mix, reaction, cure, and
optimum yields, chemicals should not be dispensed if the
chemical temperature is below 65°F (18°C) . Insufficient
operating temperatures can cause improper mix, extend
cure time, and adversely affect final physical properties
and yields .
NOTE: When using polyurethane foam, estimate 10% more foam than
is required . This yield buffer is recommended so that you will not run
out of chemical on a job site .
Section 12
Recommended Starting Pressures
A side
Insulation Class A 180
Sealant 180
Section 13
Anti-crossover Nozzles
DuPont provides various anti-crossover nozzles with various
spray patterns for use with the Insta-Flo
operate the Insta-Flo Gun between 6 and 36 inches from the
™
surface being sprayed . Move the Insta-Flo Gun in a steady but
relatively slow back and forth motion . This will provide an even
coverage . Do not spray over rising foam .
The cone type nozzle provides a round spray pattern for
multiple applications and surfaces .
20
The fan type nozzle provides a fine fan spray pattern resulting
in a smooth foam surface (paint spray finish) .
The caulking type nozzle provides a bead pattern for ultra fine
coverage and has less overspray .
Refer to Insta-Flo
Section 14
Nitrogen Regulator
14.1 Important - Safety Information
B side
180
180
Gun . For best results,
™
™ Gun and Anti-Crossover Nozzle drawings, pages A3-A4 .
1 . NEVER use regulators on cylinders of which the gas
pressure exceeds 3000 pounds per square inch
2 . NEVER set chemical tank pressure over 225psi .
3 . NEVER use oil or petroleum base grease on regulator,
inlet connection, or cylinder valve . An explosion or fire
could result . The lubricant used on this regulator
adjusting screw is Dow-Corning No . 44 silicone grease
which is a non-petroleum base grease .
4 . NEVER stand in front of, or behind a regulator while
opening the cylinder valve .

14.1.1 Instructions

1 . Before attaching the regulator to the nitrogen
cylinder valve outlet, open the valve for a few seconds,
allowing the gas to force out any possible foreign
matter .
2 . Attach the regulator to the Nitrogen cylinder valve
and tighten the inlet nut securely with an adjustable
wrench .
3 . Before opening the cylinder valve, turn the adjustin
screws (valve stems) to the left until no tension is felt .
NOTE: NEVER open cylinder valve until spring tension on the valve
stems have been released
4 . Open cylinder valve slowly . DO NOT stand in front of
or behind regulator while opening the cylinder valve
5 . Turn valve stems clockwise until the low pressure
gauge registers the desired working pressure . Nitrogen
Regulators are available through DuPont or:
Airgas North Central Inc .
1250 W . Washington Street
West Chicago, IL 60185
Phone: (630) 231-9260
Refer to Nitrogen Regulator Assembly drawing, page A-2 . The regulator is
not pressure releasing - turning the regulator to a lower psi will not reduce
pressure in the tank until the pressure is manually vented
.