A (Red) and B (Blue) Components. Graco 313998L - HFR, Repair - Parts

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A (Red) and B (Blue) Components. Graco 313998L - HFR, Repair - Parts | Manualzz

A (Red) and B (Blue) Components

Moisture Sensitivity of


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.

NOTE: 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.

• Keep the IsoGuard Select cylinder filled with Iso-

Guard Select, part 24F516. 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.

• 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 ISO pump oil or grease when reassembling.

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

• 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.

• Most materials use ISO on the A (Red) side, but some use ISO on the B (Blue) side. See the following section.

A (Red) and B (Blue) Components


Material suppliers can vary in how they refer to plural component materials.

Be aware that when standing in front of the manifold on proportioner:

• Component A (Red) is on the left side.

• Component B (Blue) is on the right side.

For all machines:

• The A (Red) side is intended for ISO, hardeners, and catalysts.

• If one of the materials is moisture-sensitive that material should always be on the A (Red) side.

• The B (Blue) side is intended for polyols, resins, and bases.

NOTE: For machines with material volume ratios other than 1:1, the higher volume side is typically the B (Blue) side.

20 313998L


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