Starch Ether Anti-Sag Additive for Mortar
CAS Number: 9032-08-0
Modified starch ether is a specialty additive for dry-mix mortars that dramatically improves anti-sag performance on vertical surfaces, enabling thick-layer application without slumping. It acts as a thixotropic agent at low dosage (0.02–0.1% by dry mortar weight), significantly increasing the sag resistance while maintaining good spreadability. It is particularly effective in combination with HPMC in tile adhesives and renders.
Technical Specifications
| appearance | White to off-white powder |
| pH (2% solution) | 6.0-8.0 |
| solid content (%) | 97±2 |
| moisture content (%) | ≤8 |
| viscosity contribution | Thixotropic thickening |
Applications
- Tile adhesives for wall tiling and large-format tiles
- External renders and plasters on vertical surfaces
- Thick-bed tile setting mortars
- Cementitious adhesive for stone and marble
- Machine-applied mortars and renders
Key Features
- Extremely effective anti-sag agent at very low dosage (0.02–0.1%)
- Imparts thixotropic behavior: stiff when undisturbed, fluid under shear
- Improves slip resistance for wall tile applications
- Synergistic with HPMC for optimized mortar performance
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