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Important Two-Component Material Information
12 312062W
Important Two-Component Material Information
Isocyanate Conditions
Material Self-ignition
Keep Components A and B
Separate
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 perfor-
mance and the life of all wetted parts.
To prevent exposing ISO to moisture:
• Always use a sealed container with a des-
iccant dryer in the vent, or a nitrogen atmo-
sphere. Never store ISO in an open
container.
• Keep the ISO lube pump reservoir (if
installed) filled with Graco Throat Seal Liq-
uid (TSL), Part 206995. The lubricant cre-
ates a barrier between the ISO and the
atmosphere.
Spraying or dispensing 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 pro-
viding sufficient ventilation in the work area.
If sufficient ventilation is not available, a
supplied-air respirator is required for every-
one in the work area.
To prevent contact with isocyanates, appro-
priate personal protective equipment,
including chemically impermeable gloves,
boots, aprons, and goggles, is also required
for everyone in the work area.
Some materials may become self-igniting if
applied too thickly. Read material manufac-
turer’s warnings and material MSDS.
Cross-contamination can result in cured
material in fluid lines which could cause seri-
ous injury or damage equipment. To prevent
cross-contamination of the equipment’s wet-
ted parts, never interchange component A
(isocyanate) and component B (resin) parts.
The amount of film formation and rate of
crystallization varies depending on the
blend of ISO, the humidity, and the tem-
perature.