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ASKRONING

Special pre-coated mold material for coresand molds exposed to high temperaturesThe shell molding process

ASKRONING – pre-coated sands at a glance
Service profile:

The shell molding process, which is also known by the name of its inventor as the Croning®*

process,• Very good flowability and reproduction accuracy• Very good casting surfaces• Good hot and cold bending strengths• Good thermal stability and dimensional accuracy

is a core and mold making process that makes use of phenolic resin-coated dry, free-flowing mold

• Good disintegration and good decoring ability

materials which solidify around the pattern through hot curing. The wall strengths of these core andAreas of application:

mold components can be adjusted depending on the requirements, enabling different product-specific• Gray cast iron

• Steelrequirements to be realized. The Croning• Ductile iron

• Aluminum / brass®*shell molding process is therefore especially suited to themanufacture of complex casting geometries made of nearly any casting alloy.
* Croning® is a registered trademark of ACTech GmbH.

Very well suited to:• Cores that are subject to maximum stressin the casting and solidification process• Hydraulic casting• Oil duct cores• Cylinder head manufacturePackaging:• 25 kg sacks• 1,500 kg big bags

• 1,000 kg big bags

• Silo trucks

Individual solutions
Thanks to our R&D departments we are in the position to develop ASKRONING pre-coated sands for
specific requirements, tailoring them to customers’ individual process demands. Consequently, taking
The shell molding process is especially suitable for the manufacture of:into account the pre-existing process parameters, we can appropriately adjust the key properties of a

• Thin-walled and delicate hollow cores and molds

high-grade pre-coated sand for whatever application.

• Cores that need to have very good disintegration properties due to a lack of apertures• Cores that require high strengths

Characteristics:• AFS number• Bulk density• Loss on ignition• Melting point• Hot bending strength• Nitrogen content• Cold bending strength

Phenolic resin-bonded ASKRONING pre-coated sand special blends
Certain process requirements can necessitate the use of special sands. These special sands, compared
to quartz sand, are characterized by other specific physical-thermal properties and, in particular, by thesignificantly lower thermal expansion behavior in certain temperature ranges. Thanks to our access to alarge variety of special sands, we at ASK Chemicals are able to offer individually developed and adapted

Advantages of the ASKRONING pre-coated sands:• High dimensional accuracy• Low molding sand consumption by hollow cores

ASKRONING special pre-coated sand blends for specific requirements. Together with our technical ser-

• Low wall strengths possible• ASKRONING is suitable for all casting alloys• Production option of intricate casting contours• Ready-to-use

vice team and our R&D departments, we are therefore able to develop the most suitable ASKRONING• Very good disintegration properties of the mold material• Long bench life of ASKRONING sands and of coresand molds manufactured with ASKRONING• Reduced cleaning costs

for any application.