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High-efficiency rheology modifier providing excellent viscosity build and sag resistance in alkaline systems.
Delivers outstanding shear-thinning behavior for optimal application performance and leveling.
Enhances water retention and improves open time in cementitious and gypsum-based formulations.
Offers good compatibility with common surfactants, biocides, and co-thickeners such as hydrophobically modified ethoxylated urethanes (HEUR).
Enables low-odor, VOC-compliant formulations suitable for indoor applications.
Interior and exterior architectural paints and coatings.
Cement-based tile adhesives and grouts.
Gypsum-based joint compounds and finishing plasters.
Water-based decorative mortars and textured coatings.
Fire-resistant intumescent coatings and sealants.
| Chemical Type | Acrylic alkali-swellable emulsion polymer |
| Product Form | Aqueous dispersion |
| Appearance | Opaque white liquid |
| pH (1% aqueous solution) | 2.5–4.0 |
| Active Content (wt%) | 25.0–27.0% |
| Density (20 °C) | Approx. 1.02 g/cm³ |
| Viscosity (Brookfield RVT, spindle #3, 20 rpm, 25 °C) | 500–1500 mPa·s (as received) |
| Primary Applications | Waterborne architectural coatings, cementitious and gypsum-based building materials |
Q1: What is the primary thickening mechanism of Rheovis AS 1125?
A: Rheovis AS 1125 is an acrylic acid-based associative thickener that swells and develops viscosity upon neutralization with alkaline agents (e.g., AMP-95, NaOH, or TEA), forming an expanded polymeric network in aqueous systems.
Q2: In which types of formulations is Rheovis AS 1125 most commonly used?
A: It is widely applied in waterborne architectural coatings (e.g., interior and exterior paints), industrial maintenance coatings, and certain water-based adhesives and sealants where stable rheology, good sag resistance, and spatter resistance are required.
Q3: How should Rheovis AS 1125 be incorporated into a formulation?
A: It is typically added as a pre-neutralized paste or slurry during the let-down stage, after initial pigment dispersion. Direct addition to highly acidic or unbuffered systems should be avoided; pH adjustment to ≥7.5 prior to or during incorporation ensures optimal swelling and performance.
Q4: Is Rheovis AS 1125 compatible with common co-thickeners and rheology modifiers?
A: Yes — it is frequently combined with cellulosic thickeners (e.g., HEC) or hydrophobically modified ethoxylated urethanes (HEURs) to achieve synergistic rheological profiles, balancing high-shear flow with low-shear viscosity and improved leveling.
Q5: What are key handling and storage considerations for this product?
A: Store in tightly sealed containers at temperatures between 5 °C and 30 °C, protected from freezing and prolonged exposure to direct sunlight. Avoid contamination with strong oxidizing agents or incompatible solvents, and always follow BASF’s Safety Data Sheet for safe handling practices.
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