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Isocyanate Hazard
Spraying materials containing isocyanates creates
potentially harmful mists, vapors, and atomized
particulates.
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 the work area. If sufficient ventilation is not
available, a supplied-air respirator is required for
everyone in the work area.
To prevent contact with isocyanates, appropriate
personal protective equipment, including chemically
impermeable gloves, boots, aprons, and goggles, is
also required for everyone in the work area.
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, increas-
ing 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 crystal-
lization varies depending on the blend of ISO,
the humidity, and the temperature.
Warnings
To prevent exposing ISO to moisture:
•
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 lubricant
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 contami-
nated from the other side.
•
Always park pumps when you shutdown.
•
Always lubricate threaded parts with Part 217374 ISO
pump oil or grease when reassembling.
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