Graco 295616 Moisture Sensitivity of Isocyanates, Isocyanate Hazard, Foam Self-Ignition

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Moisture Sensitivity of Isocyanates

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 crystallization 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.

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 contaminated from the other side.

Always lubricate threaded parts with Part 217374 ISO pump oil or grease when reassembling.

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 respirator, gloves, and protective clothing when using isocyanates.

Foam Self-Ignition

Some materials may become self-igniting if applied too thick. Read material manufacturer’s warnings and material MSDS.

Keep Components A and B Separate

CAUTION

To prevent cross-contamination of the equipment’s wetted parts, never interchange component A and component B.

Changing Materials

When changing materials, flush the equipment multiple times to ensure it is thoroughly clean.

Check with your material manufacturer for chemical compatibility.

Some materials use catalyst on the A side, but some applications may use catalyst on the B side.

Epoxies often have amines on the B (catalyst) side. Polyurethanes often have amines on the B (resin) side.

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Contents Important Safety Instructions Ratio Transfer PumpContents Equipment Misuse Hazard Moisture Sensitivity of Isocyanates Isocyanate HazardFoam Self-Ignition Keep Components a and B SeparateTypical Installation, without Circulation Key for FIGTypical Installation, with Circulation Typical Installation, with CirculationTypical Installation for Lubrication Applications Typical Installation for Lubrication ApplicationsInstallation System AccessoriesAir Line Accessories Fluid Line AccessoriesSetup Grounding the System Pressure Relief Procedure OperationFlushing Daily StartupAir Motor Repair Series a Air ValveWLD Pump Lower Repair Remove pins 55. See FIG Seal stack enlarged to show detail Troubleshooting ReassemblyProblem Cause Solution Parts Model 51cPart Description Qty GASKET, PtfePart Description 103538 CLAMP, ground Part DescriptionFluid Drain Valve Qty Part DescriptionDimensions Technical DataT2 21 Ratio Transfer Pump Metric Performance Chart Key Air PressureGraco Standard Warranty Graco Information