Hüttenes-Albertus Foundry Binders, Coatings and Special Sands

Selection and quotation of Hüttenes-Albertus (HA Group) foundry materials: Sigmacure, Biocure and Cordis binders, No-Bake resins, refractory coatings, Kerphalite and Cerabeads special sands.

Sigmacure, Biocure, Silcure and Sipurid Cold-Box Binders

Two-component Cold-Box binders: a phenolic resin and a polyisocyanate, cured without a heated core box. Sigmacure uses aromatic solvents, Biocure methyl esters from rapeseed, while Silcure and Sipurid add silicate elements that lower BTX and BTEX emissions.

Biocure: plant-based solvent since 1996
Silcure: silicate-containing solvent since 1999
HA Pure line: free phenol below 1.0%
Sipurid: silicate elements in the resin molecule

Cordis Inorganic Binder with Anorgit Additive

Cordis is an inorganic core binder based on a silicate solution and is used with the inorganic Anorgit additive. Water serves as the solvent: the core cures in a heated core box and the water is expelled with heated air. Pouring gives no smoke, BTX, BTEX, amines or odour.

Two-component system: Cordis and Anorgit
Curing by heat and removal of water
No condensate deposits, longer tool life
Inorganic binders in the HA range since 2003

No-Bake Cold-Curing Binders

No-Bake binders for small, large and very large moulds and cores. The range covers furan and phenolic resins, polyurethane No-Bake for short and medium series and the resole-ester process for steel. Modified No-Bake binders are used on most sand 3D printers worldwide.

Nitrogen-free furan resin grades for steel
Low-sulphur systems for ductile iron
Free formaldehyde content below 0.05%
Resole-ester: free of nitrogen, sulphur, phosphorus

Hot-Box, Warm-Box, Shell Moulding Resins and Carbophen

Hot-Box and Warm-Box use urea and urea-modified furfuryl alcohol resins, Resital phenolic resins and the Thermoshock process for radiator cores. For Croning shell moulding HA offers Corrodur resins, Resital precoated sand and KeraCron. Carbophen is a single-component binder cured with CO2.

Resital: nitrogen-free phenolic resin
Thermoshock process: radiator cores
KeraCron: temperature resistance above 1800 °C
Carbophen: no nitrogen, sulphur or phosphorus

Refractory Coatings and Die Coatings

Water- and alcohol-based refractory coatings for moulds and cores, with over one hundred formulations matched to process, alloy and application method. Dedicated series serve 3D printed cores and centrifugal work. Die coatings for gravity and low-pressure dies ease removal of the part.

Over 100 coating formulations
Water- and alcohol-based coatings
Coatings for 3D printed cores
Die coatings with lubricating effect

Kerphalite, Cerabeads, M-Sand and J-Sand Special Sands

Special moulding sands with lower thermal expansion than quartz in the 20–600 °C range help avoid veining and metal penetration. Kerphalite KF is andalusite, M-Sand fused mullite, Cerabeads sintered mullite and J-Sand a feldspar and quartz mixture; bauxite sand is also offered.

Kerphalite KF: refractoriness above 1800 °C
Cerabeads: over 80% mullite
J-Sand: 50% lower linear expansion than quartz
Bauxite sand: at least 72% Al2O3

Choosing a Binder by Process

Cold-Box suits series cores: the sand cures by gassing without a heated core box, and tooling can be plastic, wood or metal. Sigmacure fits any existing equipment, Biocure is particularly suitable for bentonite-bonded moulding material, while Silcure and Sipurid with low gas evolution suit die work.

Inorganic Cordis cures in a heated core box and removes emissions at pouring. No-Bake serves large and one-off moulds, Hot-Box and Warm-Box cores of high complexity, and Resital and KeraCron shell sands fine thin-walled cores.

Choosing a Coating by Composition and Method

A coating smooths the porous surface of moulds and cores: the refractory base insulates the sand from the melt and prevents penetration and veining. Water-based coatings are emission-free and storage-stable.

The formulation is adjusted through the refractory materials, carrier liquid and binder; for large parts there are highly refractory zirconium-free coatings.

Die coatings differ in insulation: ultra-fine low-insulation grades for thicker walls with smooth surfaces, rougher high-insulation grades for very thin walls with long flow paths.

Choosing a Special Sand by Alloy and Veining Risk

The choice depends on part complexity, metal, susceptibility to veining, pouring temperature and binder system. J-Sand in PUR-Cold-Box cores allows automotive series parts without sand expansion defects and without gas-forming additives, but is not used for steel.

Under extreme thermal stress with a high veining tendency Kerphalite KF, Cerabeads or M-Sand are recommended, and they also serve as base sand for steel. Bauxite sand is used for water jacket cores of engine blocks and cylinder heads, including inorganic cores for electric drive trains.

Chemex Feeders and Green Sand Additives

Exothermic and insulating feeders come from the subsidiary Chemex Foundry Solutions (Delligsen, founded in 1974): each feeder is designed for its application, volumes range from very small to over 11 litres, and every variant has its own recipe.

For green sand HA offers alternatives to sea coal: with coal-free Ecosec the addition rate can be reduced by up to approximately 15% compared to coal dust, while inorganic Purforma is non-flammable and aims at substantial emission reductions.

Hüttenes-Albertus and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Hüttenes-Albertus and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.