Landu Novastar™
Construction Additive
Reliable Versatile Performance Additive for
Gypsum, Putty & Plastering Systems
Key Features
Weak Alkaline Formulation
Stable compatibility across gypsum, putty and plaster systems
Excellent Workability & Smooth Application
Consistent spreadability and superior surface finish
Superior Anti‑Sagging
Reliable vertical stability for walls and overhead surfaces
Proven Reliability
Uniform performance across diverse construction operations
Eco‑Friendly Hydroxypropyl Starch Ether for Gypsum, Lime & Plaster Formulations
Landu Novastar™ ST1403B is a versatile‑grade Hydroxypropyl Starch Ether engineered for high‑performance gypsum putty, lime‑calcium, and hand‑applied plaster systems.
Its weak‑alkaline design and controlled viscosity (500–1000 mPa·s) provide excellent application stability and smoothness across different mortar formulations.
Produced from renewable plant sources through advanced etherification technology, the ST1403B Hydroxypropyl Starch Ether offers reliable quality, environmental sustainability, and operator safety.
| Property | Specification |
|---|---|
| Appearance | White fine powder |
| Viscosity (5% solution) | 500 – 1000 mPa·s |
| pH (1% solution) | 4.0 – 8.5 |
| Loss on Ignition | ≤ 12 % |
| Moisture Content | ≤ 10 % |
| Particle Size | ≥ 98% pass 100 mesh |
| Bulk Density | 500 – 900 g/L |
| CAS Number | 9049‑76‑7 |
Stable in pH 4.0–8.5 systems including gypsum and lime bases.
Improves flow, spreadability and manual troweling efficiency.
Controlled thixotropy for uniform vertical application.
Ensures proper hydration and reduces surface cracking.
Smooth, defect‑free finish ready for painting.
Allows adjustments for large‑area work.
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Proven consistency across multiple application types — from gypsum putty to hand plastering and joint compounds.
| Application Type | Typical Dosage (by dry mix weight) |
|---|---|
| Gypsum putty | 0.15 – 0.30 % |
| Lime‑calcium putty | 0.20 – 0.35 % |
| Hand plastering | 0.10 – 0.25 % |
| Gypsum joint compound | 0.15 – 0.30 % |
ST1403B is engineered for weak-alkaline construction systems. Select any application below to explore formulation details, performance characteristics, and recommended dosage ranges.
Smooth, workable finish for interior wall applications.
ST1403B significantly improves the rheological profile of gypsum putty — delivering a buttery, smooth consistency that reduces troweling resistance and enhances final surface quality, making it ideal for high-end interior finishing.
Anti-sagging & water retention for vertical coatings.
In lime-calcium systems, ST1403B's weak-alkaline compatibility (pH 4.0–8.5) ensures stable performance. Its controlled thixotropy prevents sagging on vertical surfaces while maintaining excellent open time for large-area application.
Better cohesion & plasticity for manual mortar work.
ST1403B enhances the cohesion and plasticity of plastering mortars, reducing operator fatigue during manual application. The improved water retention ensures consistent hydration across the mortar layer, minimising shrinkage cracks.
Precise viscosity for feathering, leveling & skim coats.
For gypsum board jointing and skim coat systems, ST1403B provides the precise viscosity and open time needed for feathering and leveling. The result is a flawlessly smooth surface that accepts paint or texture coatings without defects.
| Product | Viscosity (mPa·s) | Ash Content | pH Range | Best Use |
|---|---|---|---|---|
|
ST1403B
Featured Grade
|
500 – 1 000
|
≤ 12 % | 4.0 – 8.5 | Gypsum / Putty systems (weak alkaline) |
|
ST1506A
Universal Grade
|
500 – 3 500
|
≤ 12 % | 4.0 – 8.5 | Universal multi‑application grade |
|
ST1703A
High Viscosity
|
1 500 – 4 000
|
≤ 10 % | 4.0 – 8.5 | Machine spray mortar |
|
ST3547
Economy Grade
|
200 – 1 500
|
≤ 8 % | 4.0 – 8.5 | Economy formulations |
Stable viscosity for manual workability
Perfect pH range for weak alkaline systems
Consistent long‑term performance and ease of use
Smooth texture and quick mixing behavior
Manufacturing Process — Built on Precision, Validated by Science
Proprietary etherification technology with real-time quality control at every production stage, ensuring batch-to-batch consistency.
Real-time QCProcess engineered for pH 4.0–8.5 compatibility, delivering stable performance across gypsum and lime-based construction systems.
pH 4.0 – 8.5Responsibly sourced raw materials with ISO-certified operations and full environmental compliance throughout the supply chain.
ISO CertifiedEvery batch validated for pH stability, anti-sagging resistance and workability before dispatch — no exceptions.
Lab ValidatedHydroxypropyl Starch Ether
Adjust dosage for desired workability, open time and retention.
Pair with cellulose ethers (HPMC/MHEC) and RDP powders for synergistic effects.
Control air and working time through additive fine-tuning.
Stable performance across temperature range 5–35 °C.
Our engineers offer application consulting, performance testing & technical optimization services.
Discover how ST1403B HPS can increase workability, stability and efficiency in your gypsum and putty formulations. Partner with Landu's expert team for next-generation results.
