Alumino-Silicate Water-Based Coating
An engineered thermal-insulating refractory coating enriched with iron oxides for Grey Cast Iron (CI), Ductile SG Iron, and steel casting foundries — specifically formulated to prevent thermal shock, suppress core veining and finning, and deliver clean peel-off with high gas permeability.
Engineered Anti-Veining Barrier for Extreme Pouring Heat
Alumino-Silicate Based Water Coatings are high-performance refractory slurry systems composed of finely milled aluminium oxide ($\text{Al}_2\text{O}_3$) and silicon dioxide ($\text{SiO}_2$) mineral complexes, enriched with select iron oxides and suspended in an aqueous carrier. Designed specifically for cores and moulds exposed to intense thermal shock during pouring (1200°C – 1500°C), this coating forms a microscopic thermal barrier that moderates rapid heat transfer to silica sand grains, drastically reducing core cracking, thermal stress, and liquid metal finning.
Unlike pure heavy zircon washes, alumino-silicate coatings offer superior gas permeability. The natural microporosity of the refractory film allows volatile binder gases to escape safely through the sand matrix without creating backpressure or subsurface gas pinholes. At BR Chemicals, each batch is precision-monitored in our quality control lab for specific gravity, Baume density, suspension index, and active solid content, guaranteeing zero settling, even coating build, and flawless surface finish on every cast component.
Superior Thermal Cushion & Surface Protection
A proven water-based refractory system chosen by modern iron and steel foundries across India to eliminate costly post-casting fettling and rework.
Thermal Shock Cushion
Acts as an insulating heat buffer that moderates thermal expansion in silica sand cores, completely arresting hot tears, veining, and finning.
Iron Oxide Enriched
Integrated iron oxide chemically passivates the core surface, minimizing chemical reactivity with metal oxides and eliminating sand burn-on.
Controlled Gas Permeability
Micro-porous refractory architecture allows organic binder gases to vent safely during casting, eliminating gas holes and blow defects.
Clean Peel & Easy Fettling
Leaves an ultra-smooth, non-adherent barrier layer that easily peels away from the casting during knockout, reducing shot-blasting time by up to 35%.
Industrial Foundry Applications
- ✓ High-precision cores prone to veining: cylinder jackets, cylinder heads, engine blocks, and valve chambers
- ✓ Grey Cast Iron (CI) casting moulds and cores on continuous no-bake and green sand automated lines
- ✓ Spheroidal Graphite (SG / Ductile) Iron components requiring defect-free internal passageways
- ✓ Alloy iron and heavy structural engineering castings subjected to extended pouring cycles
- ✓ Cold Box (PUCB), Shell Core, Furan, and Alkaline Phenolic sand binder systems
- ✓ Hydraulic manifolds, turbine casings, pump impellers, and fluid control equipment
Technical Snapshot & Available Grades
Standard Anti-Veining Slurry
Our flagship water-based alumino-silicate wash designed for high suspension stability, smooth brushing, and automated dipping applications.
High-Solids Premium Grade
Enhanced with high-purity iron oxides and refractory fillers for maximum heat insulation and zero reactivity against molten alloy iron oxides.
Versatile Jobbing Grade
Formulated with graphite and iron oxide synergists for flexible jobbing foundry applications, deep cavities, and rapid oven drying cycles.
Dilution, Mixing & Application Guidelines
01. Dilution Ratios
For AS-1422-W: 300 g coating paste + 100 g clean water for flow/dip coating.
For AS-1422-XLM: 100 g paste + 30 to 35 g clean water. Adjust with Baumé meter.
02. Mixing & Agitation
Always mix with a pneumatic or mechanical high-shear agitator before use. Keep under continuous slow agitation in dip tanks to prevent refractory settling.
03. Drying Procedure
Ensure cores/moulds are dried in hot-air ovens or convection dryers at 120°C – 160°C until moisture is completely eliminated before core setting.
Technical Data Specifications
| Property / Parameter | Technical Specification |
|---|---|
| Refractory Base | Alumino-Silicate ($\text{Al}_2\text{O}_3 \cdot \text{SiO}_2$) enriched with Iron Oxides ($\text{Fe}_2\text{O}_3$) |
| Carrier System | Aqueous (Water-Based, Non-Flammable, Zero VOC) |
| Physical State & Appearance | Thixotropic, smooth reddish-brown viscous liquid / paste |
| Active Solid Content | 48% – 53% (Grade dependent: AS-1422-W / AS-1422-XLM) |
| Coating Density (at 20°C) | 1.40 – 1.60 g/cc (Bulk Density: 130 – 135 g/100 ml) |
| Baumé Density (Working) | 40° – 55° Bé (Adjustable according to application method) |
| Thermal Refractoriness | > 1550°C |
| Application Methods | Dipping, Brushing, Flow Coating, or Airless Spraying |
| Standard Packaging | 30 Kg Air-Tight Plastic Buckets / 250 Kg Barrels / 1200 Kg IBC |
| Shelf Life & Storage | 6 months from manufacturing date. Store in cool, shaded area above 5°C. Keep lid tightly closed. |
*Values listed above are typical laboratory findings. BR Chemicals can tailor viscosity, drying rate, and iron oxide loading to suit your specific core geometry, sand fineness (AFS), and pouring temperature.
Request Technical Consultation & Trial Samples
Eliminate veining defects and achieve smooth, sand-free castings. Share your core parameters and alloy specifications with BR Chemicals' technical team to receive tailored slurry recommendations and a competitive price quotation within 24 hours.
