Graco XP70s-hf 577222 [8/86] Moisture sensitivity of isocyanates

Graco XP70s-hf 577222 [8/86] Moisture sensitivity of isocyanates
Important Isocyanate (ISO) Information
8 3A6283H
Moisture Sensitivity of
Isocyanates
Exposure to moisture (such as humidity) will cause ISO
to partially cure, forming small, hard, abrasive crystal
that become suspended in the fluid. Eventually a film will
form on the surface and the ISO will begin to gel,
increasing in viscosity.
NOTE: The amount of film formation and rate of
crystallization varies depending on the blend of ISO, the
humidity, and the temperature.
Changing Materials
NOTICE
Partially cured ISO will reduce performance and the
life of all wetted parts.
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 pump wet cup or reservoir (if
installed) filled with appropriate lubricant. The
lubricant creates a barrier between the ISO and
the atmosphere.
Use only moisture-proof hoses compatible with
ISO.
Never use reclaimed solvents, which may
contain moisture. Always keep solvent
containers closed when not in use.
Always lubricate threaded parts with an
appropriate lubricant when reassembling.
NOTICE
Changing the material types used in your equipment
requires special attention to avoid equipment
damage and downtime.
When changing materials, flush the equipment
multiple times to ensure it is thoroughly clean.
Always clean the fluid inlet strainers after
flushing.
Check with your material manufacturer for
chemical compatibility.
When changing between epoxies and
urethanes or polyureas, disassemble and clean
all fluid components and change hoses.
Epoxies often have amines on the B (hardener)
side. Polyureas often have amines on the B
(resin) side.

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