1. Characteristic:

CASTCHEM’s LFC refractory coatings are highly permeable refractory materials for ductile iron and steel castings.The coatings have a high viscosity with exceptional anti-flow properties, resulting in a smoother, stronger coating that will not crack or wrinkle after coating.  The coating has a very wide range of water dilutions to find the optimum coating thickness for manufacturers to eliminate metal penetration and carbon-rich defects to eliminate surface cleaning issues.

2. Physical properties of finished products:

           Appearance: Powder

           Color: Grey brown

           Refractory material: Aluminosilicate        

           Solvent: Water

           Net wet/Bag: 25kgs.

           Refractoriness: 1700℃

           Air permeability: 0.6mm-260, 0.8mm-210,1.0mm-140

3. Directions:

1. High-speed Mixing: Coatings : Water= 1:0.65 to 0.68. Add water into the bucket until until the fan is immersed, adjust the stirring speed to 400 r/min and add coatings slowly. After adding all coatings, adjust to 600 r/min and keep mixing for 2 hours. Pay attention to the state of the coatings slurry, the coating slurry’s Baume degree should between 65 to 73 degrees, and then stir continuously at 400 r/min for 1 hour.

Operators should keep daily records, from which to find the optimal dosage of water and coatings.

2. Low-speed Mixing: Slow pre-mixing for 10 minutes (especially for new unused tubs). High-speed mixing for thick coating must be diluted with water. The agitator is equipped with a variable-speed motor, a container with considerable capacity , and a ring plate device. The stirring speed is 10-60 revolutions per minute. The ideal agitation speed depends on the type of coating and the size of the tank. After finding the desired speed, the stirring should be carried out at the desired speed. The coating shall be modulated to a concentration of between 65 and 73 Baume degrees. The Baume degrees of the coating shall be varied depending on the wall thickness, dimensions and complexity of the casting. The Baume degrees also varies with temperature. Baum degrees is slightly lower due to lower temperatures in winter, for the same reason, Baum degrees is higher in summer. We recommend that factories should find the optimum result in terms of pack degree and percentage of coating content according to actual conditions, and try to control these conditions to maintain the quality of the castings. It should be noted that the viscosity will be affected by the temperature and the stirring speed, the viscosity will affect the value of the Baume degrees, reduce the value of Baume degrees will reduce the attached solid coatings on the foam-pattern.

3. Coating: CASTCHEM's iron coating materials for foundry chemistry are very sensitive to shear strength, i.e., their viscosity varies with mixing speed. Therefore, the weight of the slurry deposited on the surface of the foam pattern during immersion is affected by the stirring force. In order to obtain high quality castings, the stirring speed and Baume degree should be well controlled. We recommend using dipping water as a mixing agent. Some plants can be mixed continuously for a period of time and then dipped. The viscosity will increase rapidly for a period of time just after the mixing has stopped and then gradually stabilize. Additionally, the immersion rate, dwell time and removal rate of the pattern are also very important. For complex castings, the mould should be ensured that air bubbles do not remain during the dipping process.

4. The Main Specification of Castchem’s Coatings Material

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