Coalbond 75 Powder

Coalbond 75 Powder


CHARACTERISTICS & FEATURES:
Coalbond Powder is finding increasing application in progressive
foundries as a substitute for coaldust powder in green sand molding
for gray malleable & S.G.Iron castings.

It is prepared from carefully selected
raw materials of controlled chemical composition & fitness.

GRADES OF COALBOND POWDER








Grade


Ash content


Volatile Matter




Coalbond 75 Powder


3.0% Max


75% Min


ADVANTAGES OF COALBOND POWDER OVER COAL DUST Better Casting Finish: Coalbond Powder generates higher amount of lustrous carbon than coal dust. Hence better casting finish is observed even with addition as low as 0.3 -0.4% on sand (Lustrous carbon in coalbond is nearly 7 times more than coal dust) Lower Ash Content : Hence better refractoriness of sand and lower sand fusion. Lower % of new sand : Resulting in overall cost reduction. Lower Moisture Addition: Unlike coal dust coalbond does not absorb moisture hence lower moisture addition is required to get temper bond. This minimizes the chances of blowholes in castings. Acts as excellent anti-scabbing agent. Improves sand flow-ability and texture. Reduces metal penetration & gives sharp corners. It is dust free and results in cleaner atmosphere in foundry.


METHOD OF USING : Product application
should be started with 1% by weight with returned sand to new sand
ratio as 80:20 from 1% it has to be reduced gradually and stabilized
to 0.3-0.4%

Practices vary from foundry to foundry.
Each foundry will take its own judgment to stabilize the lowest
percentage of addition from our practical experience and trials
conducted at various foundries we recommend following procedure for
its application.

Stop use of coal dust completely &
start use of 1% Coal bond 75 powder. Keep return sand 80% and new
sand 20%. This will flush out the coal dust in the system.




Subsequently reduce the coalbond
addition by 0.25% for next 5 cycles and ultimately stabilize on 0.3-0.4 % addition. SHELF LIFE : 6 Months from date of
manufacture
STD.PACKING : 40 Kg.arklene bags
STORAGE : Store in a dry place.