Two carrier-specific grades
Separate water-based and alcohol-based grades mean the suspension agent is matched to the liquid phase of your coating instead of compromised across both.
Specialty Chemical
Foundry Coating Rheology Modifier for Water and Alcohol Coatings
A mineral-based suspension agent that keeps refractory fillers evenly suspended in foundry coatings, from the storage tank to the mould surface.
PowderPre-gel Dispersion
ISO 9001 certified processes
NABL-accredited lab testing
CoA, TDS & MSDS with every shipment
Export packaging worldwide
Overview
What is Foundry Coating Rheology Modifier?
A foundry coating rheology modifier is an additive that gives refractory mould and core coatings the flow behaviour they need: thick enough at rest to hold dense fillers in suspension, yet thin enough under shear to dip, flow-coat, spray or brush evenly. Obsidian Minerals supplies a mineral-based modifier engineered for both water-based and alcohol-based foundry coating systems.
Foundry coatings carry heavy refractory fillers such as zircon flour, graphite, mica, talc and aluminosilicates. In a low-viscosity liquid these particles settle quickly, leading to hard sediment, drifting coating density and defects on the casting surface. The modifier builds a three-dimensional structure in the liquid carrier that resists settling during storage, then breaks down under shear so the coating levels to a uniform layer before it dries.
Performance depends on the carrier. Water-based coatings need a modifier that hydrates and gels in water and tolerates the binders and wetting agents used with it. Alcohol-based coatings, which are ignited or air-dried on the mould, need a modifier that develops structure in ethanol or isopropanol. For that reason the product is offered as two grades. Both are designed to keep fillers in stable suspension, to re-disperse easily after storage and to leave the refractory performance of the coating uncompromised; the water-based grade is designed for coatings in the pH 4–10 range.
The product is manufactured in Gujarat, India, under ISO 9001 certified processes, with testing in an NABL-accredited laboratory. It is supplied as a powder or as a pre-gel dispersion, with powder packed in 25 kg or 50 kg bags or jumbo bags, and every shipment carries an MSDS/SDS, Technical Data Sheet and batch Certificate of Analysis. Samples are available for coating trials, and grades can be adjusted with customers for specific refractory fillers or application methods.
Foundry Coating Rheology Modifier grades
Select a grade for its typical properties, applications, usage guidance and FAQs.
Foundry Coating Rheology Modifier
Water-based Coating Grade
A water-dispersible suspension agent that holds zircon, graphite and silicate refractories in water-based mould and core coatings.
Foundry Coatings Foundry Coating Rheology ModifierAlcohol-based Coating Grade
A suspension agent that builds structure in ethanol and isopropanol foundry coatings for fast-drying, ignitable mould and core washes.
Foundry Coatings| Grade | Specification | Primary use | Link |
|---|---|---|---|
| Water-based Foundry Coating Rheology Modifier | On TDS | Foundry Coatings | Specs |
| Alcohol-based Foundry Coating Rheology Modifier | On TDS | Foundry Coatings | Specs |
From deposit to dispatch
- 01
Mineral selection and beneficiation
- 02
Drying and controlled milling
- 03
Grade-specific treatment for water or alcohol carriers
- 04
Gel and suspension testing
- 05
QC and packing as powder or pre-gel
Why source Foundry Coating Rheology Modifier from Obsidian Minerals
Powder or pre-gel
Choose powder for in-house gelling, or a pre-gel dispersion that shortens mixing time and simplifies dosing in the coating plant.
Tested for consistency
Moisture, sieve residue and gel behaviour are checked in an NABL-accredited laboratory, with lot results reported on the batch Certificate of Analysis.
Where Foundry Coating Rheology Modifier is used
Foundry Coating Rheology Modifier — frequently asked questions
What does a rheology modifier do in a foundry coating?
A foundry coating rheology modifier builds a weak gel structure in the liquid carrier. At rest, that structure holds dense refractory fillers in suspension so they do not settle into hard sediment. Under the shear of stirring, dipping, pumping or spraying, the structure breaks down and the coating flows and levels, then recovers to limit runs and sagging on vertical surfaces.
Which grade do I need: water-based or alcohol-based?
Match the grade to the liquid carrier of your coating. The water-based grade hydrates and gels in water and suits water-borne dips, flow-coats and sprays. The alcohol-based grade develops structure in ethanol, isopropanol and their blends for ignited or fast-drying washes. If you run both coating types, each grade can be trialled in its own system.
Will the modifier affect the refractory properties of my coating?
The modifier is mineral-based and used at low addition levels, and it is designed to leave the refractory performance of the coating uncompromised. Because every coating formulation is different, we recommend confirming coating density, layer thickness, permeability and casting surface quality in your own trials before changing the formulation used in production.
What dosage of foundry coating rheology modifier is typical?
Typical additions range from about 0.5 % to 3.0 % of total coating weight for the water-based grade and about 0.5 % to 2.5 % for the alcohol-based grade. The right level depends on filler density, solids content, target viscosity and application method. Start within the range on the Technical Data Sheet and adjust using density and viscosity checks.
Is the modifier available as a pre-gel?
Yes. Both grades can be supplied as powder or as a pre-gel dispersion. Powder suits plants with high-shear mixing that prefer to activate the additive themselves. The pre-gel is ready to blend with moderate stirring, which shortens batch preparation and helps avoid incompletely activated lumps. Packing options for the pre-gel are confirmed on request.
How do I request samples of the foundry coating rheology modifier?
Send our team details of your coating: carrier type, main refractory filler, solids content, application method and approximate annual volume. We will recommend a grade and form, then send a sample with the Technical Data Sheet so you can run suspension, settling and application trials on your own coating.
What packaging options are available for Foundry Coating Rheology Modifier?
Standard export packing is 25 kg or 50 kg HDPE / paper bags and 1 MT or 1.2 MT jumbo (FIBC) bags, palletised and shrink-wrapped on request. Custom and private-label packaging can be arranged for volume orders.
Do you provide MSDS and technical datasheets?
Yes. A Technical Data Sheet and MSDS are available for every grade, and each shipment is accompanied by a batch-specific Certificate of Analysis.
Request a quote
Interested in Foundry Coating Rheology Modifier?
Tell us your application, preferred grade and volume. Our engineering team will recommend the right grade and send a datasheet, sample and quotation.
- Technical Data Sheet & MSDS
- Samples for qualification trials
- Bulk and recurring supply pricing