Graco 309572ZAG Manual De Usuario

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Important Isocyanate (ISO) Information
309572ZAG
11
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 crystal-
lization varies depending on the blend of ISO, the 
humidity, and the temperature.
Foam Resins with 245 fa 
Blowing Agents
Some foam blowing agents will froth at temperatures 
above 90°F (33°C) when not under pressure, especially 
if agitated. To reduce frothing, minimize preheating in a 
circulation system.
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 appropri-
ate 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 chemi-
cal compatibility.
When changing between epoxies and urethanes 
or polyureas, disassemble and clean all fluid com-
ponents and change hoses. Epoxies often have 
amines on the B (hardener) side. Polyureas often 
have amines on the B (resin) side.