Important Two-Component Material Information. Graco 313998ZAA, HFR, Hydraulic, Fixed-Ratio Proportioner, Repair-Parts

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Important Two-Component Material Information. Graco 313998ZAA, HFR, Hydraulic, Fixed-Ratio Proportioner, Repair-Parts | Manualzz

Important Two-Component Material Information

Important Two-Component Material Information

Isocyanate Conditions

Spraying or dispensing materials containing isocyanates creates potentially harmful mists, vapors, and atomized particulates.

Read material manufacturer’s warnings and material

MSDS to know specific hazards and precautions related to isocyanates.

Prevent inhalation of isocyanate mists, vapors, and atomized particulates by providing sufficient ventilation in the work area. If sufficient ventilation is not available, a supplied-air respirator is required for everyone in the work area.

To prevent contact with isocyanates, appropriate personal protective equipment, including chemically impermeable gloves, boots, aprons, and goggles, is also required for everyone in the work area.

Material Self-ignition

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

Keep Components A (Red) and

B (Blue) Separate

Cross-contamination can result in cured material in fluid lines which could cause serious injury or damage equipment. To prevent cross-contamination of the equipment’s wetted parts, never interchange component A (Red) and component B (Blue) parts.

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

IsoGuard 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.

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Important Two-Component Material Information

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)



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.

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