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Isocyanate Hazard
Isocyanate Hazard
Read material manufacturer's warnings and material
MSDS to know the specific hazards of isocyanates.
Use equipment in a well-ventilated area. Wear respi-
rator, gloves, and protective clothing when using iso-
cyanates.
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:
•
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 felt washers in the pump wet-cups satu-
rated with Graco ISO pump oil, Part No. 217374.
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; see
Accessories, page 24.
6
•
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.
•
Always lubricate threaded parts with Part No.
217374 ISO pump oil or grease when reassembling.
Keep Components A and
B Separate
CAUTION
To prevent cross-contamination of the equipment's
wetted parts, never interchange component A (isocy-
anate) and component B (resin) parts.
Changing Materials
•
When changing materials, flush the equipment mul-
tiple times to ensure it is thoroughly clean.
•
Always clean the fluid inlet strainers after flushing;
see Fluid Inlet Filter Screen, page 19.
•
Check with your material manufacturer for chemical
compatibility.
•
Most materials use ISO on the A side, but some use
ISO on the B side.
•
Epoxies often have amines on the B (hardener)
side. Polyureas often have amines on the B (resin)
side.
311512A
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