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Isocyanate Hazard
Spraying materials containing isocyanates creates
potentially harmful mists, vapors, and atomized partic-
ulates.
Read material manufacturer's warnings and material
MSDS to know specific hazards and precautions
related to isocyanates.
Prevent inhalation of isocyanate mists, vapors, and
atomized particulates by providing sufficient ventila-
tion in work area. If sufficient ventilation is not avail-
able, a supplied-air respirator is required for everyone
in the work area.
To prevent contact with isocyanates, appropriate per-
sonal protective equipment, including chemically
impermeable gloves, boots, aprons, and goggles, is
also required for everyone in the work area.
Material Self-ignition
Some materials may become self-igniting if applied
too thickly. Read material manufacturer's warnings
and material MSDS.
Moisture Sensitivity of
Isocyanates
Isocyanates (ISO) are catalysts used in two component
foam and polyurea coatings. ISO will react with moisture
(such as humidity) to form small, hard, abrasive crystals,
which become suspended in the fluid. Eventually a film
will form on the surface and the ISO will begin to gel,
increasing in viscosity. If used, this partially cured ISO
will reduce performance and the life of all wetted parts.
The amount of film formation and rate of crystalli-
zation varies depending on the blend of ISO, the
humidity, and the temperature.
To prevent exposing ISO to moisture:
312407C
•
Always use a sealed container with a desiccant
dryer in the vent, or a nitrogen atmosphere. Never
store ISO in an open container.
•
Keep the ISO lube pump reservoir filled with Graco
Throat Seal Liquid (TSL), Part 206995. The lubri-
cant creates a barrier between the ISO and the
atmosphere.
•
Use moisture-proof hoses specifically designed for
ISO, such as those supplied with your system.
•
Never use reclaimed solvents, which may contain
moisture. Always keep solvent containers closed
when not in use.
•
Never use solvent on one side if it has been contam-
inated from the other side.
•
Always park pumps when you shutdown, see page
25.
•
Always lubricate threaded parts with Part 217374
ISO pump oil or grease when reassembling.
Isocyanate Hazard
7
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