Momentive Boron Nitride LPC Grade Coatings (Alumina Binder) for Wagstaff Casting System

Momentive Boron Nitride LPC Grade Coatings for Wagstaff Casting Systems

• Yields non-wetting, lubricating surfaces
• Melts do not stick
• excellent release properties and easy removal of melt • contains "white  
   graphite"

Momentive LPC grade Boron-Nitride-Coating is suitable for coating thimbles, transition plates and the refractory lining of the distribution trough of WagstaffTM Casting Systems. The very good non- wetting property of Momentive LPC Boron-Nitride-Coating makes an easy and effective removing of remaining melts possible. It is a proven replacement for graphocote (both based on xylene and water) when applied on thimbles and transition plates. Used on the distribution trough it replaces coatings like terracote and those based on bone ash.

Momentive LPC Boron-Nitride-Coating is a water-based paste-like products and should be diluted with distilled water prior to use. Best performance of LPC Boron-Nitride Coatings achieved by applying thin coats of 50-100μm (2-4 mils).

Application to Thimbles
When a new table is put into service with new thimbles (usually made of fused silica) the inner surface is being coated at room temperature using a soft brush. A mixture of 1 part Momentive LPC and 2 parts water give best results. Coating should air dry before heating up table to casting temperature.

During casting breaks the is being tilted upward araund 90° . Now the remaining metal is easily removed because LPC is an effective release agent. Each casting break should be used to brush the inner surface of the thimbles when being hot by using a mixture of 1 part LPC and 2-3 parts water. It is important to apply thin coats because thick coats may crack during use and do not show any technical advantages.

Application to Transition Plates
Transition plates (usually of Ca-Silicate) may be coated by brushing using a mixture or 1 part LPC and 2-3 parts water. However, it is important not to coat the porous graphite die because this could interrupt gas flow.

Application on the Refractory Lining of the Distribution Trough
After a new refractory lining is installed and coated with the sealer, Momentive LPC Boron- Nitride-Coating is brushed onto the could surface using a mixture of 3 parts LPC and 4 partsof water. A whole table will be covered by about 750g of ready to use mixture. 
During each casting break LPC Boron-Nitride-Coating can be applied on hot surface after removing aluminium by using a spray gun. Best mixture will be 1 part LPC and 3-4 parts water. 

Remark: Caused by thermal stress the refractory lining of the distribution trough shrinks during use forming cracks of a width of 0.5-2mm. Because LPC Boron-Nitride-Coating is applied in thin coats those cracks will not be covered. Therefore, these cracks must be filled in time by using a suitable repair putty. Otherwise liquid aluminium will fill these cracks causing adherence to the lining.

Storage-Container Size
Momentive LPC Grade BN Coating must be protected against frost. A storage temperature of >5°C (>41°F) is recommended. The containers should be kept closed. 

Safety
EPC Boron-Nitride-Coating contains water and is free of solvents. According to data available to us LPC Boron-Nitride-Coating is a non-hazardous preparation. Material safety data sheet is available.

Technical Data
Colour      :  White
Boron Nitride Content : 25%
Binder         : Alumina    
Temperature : 850 DegC Degree in Air, 1850 DegreesC  under inert gas
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