GRAPHITE WATER BASE COATING

GP-1419W

GRAPHITE WATER BASE COATING

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DESCPRIPTION: A black, easily-workable paste, GP-1419W, contains a mixture of crystalline and amorphous graphite’s. It is readily reduces in water.

CHARACTERISTICS: GP-1419W is particularly suited for light section iron castings where finish, dimensional accuracy and complete peel are most important. It is effective at extremely low solids content which provides excellent economy in use.

Automotive cylinder head jackets, motor body, manifolds and other cores for light, precision castings of this type are ideal for GP-1419W. Oil sand, shell and hot box cores can be coated by spray, dip or automated coating system. The total absence of foam and high dilution of GP-1419W allow coating of hot cores from shell or hot box operations without residual pock-marking or excessive coating build-up.

Cores with difficult-to-wet surfaces can be coated by using 10-20% alcohol in place of some of the water. The cause of the problem is usually surface density, wax or parting agents on the core. This alcohol addition (isopropyl alcohol is recommended) does not improve penetration and wetting of the core surface.

PHYSICAL PROPERTIES

Refractory / Filler: Graphite

Color: Black, Silvery

Form: Paste

Solvent: Water, Water/Isopropanol

Density: 200 gms Paste + 200 ml D.M. => 16 Sec +

PREPARATION: The dilution of pastes with solvent is most easily accomplished with a variable speed, mechanical stirrer. The paste is added in increments to about one-half the required solvent, crumbling is by hand and adding it to the mixing vessel with the stirrer running at high speed. When a heavy slurry stage is reached. The mixer speed is reduced of the solvent is added to reach the selected operating consistency.

Mixing with slow speed mixers or by hand should also proceed through the heavy slurry stage. In this method about one-third of the required solvent is added to the paste and the mixer slowly lowered into the paste while running. A hand-held paddle can be used to cut the solvent into the pasted until the heavy slurry is achieved—smooth and free of lumps. Then the balance of the solvent can be added.

PACKING: 50 Kg Bag