Landu Novastar™
Construction Additive
Superior Anti‑Sagging and Workability for
Machine Spray Mortar Applications
Key Features
High Viscosity Range (1500–4000 mPa·s)
Precisely engineered viscosity for consistent mortar rheology
Exceptional Vertical Stability & Anti‑Sagging
Reliable hold on walls and overhead surfaces without slippage
Enhanced Flow & Smooth Application
Superior spreadability delivering a uniform, refined surface finish
Optimized for Mechanized Spray Mortar Systems
Engineered for high-throughput machine spray operations
Landu Novastar™
High‑Performance Plant‑Based Starch Ether for Machine Spray and Vertical Applications
Landu Novastar™ ST1703A Hydroxypropyl Starch Ether is designed for professional construction applications that require superior anti‑sagging and thixotropic control. Its high viscosity and optimized molecular architecture deliver exceptional vertical stability without compromising smoothness and workability.
Produced from renewable plant sources using Landu's advanced etherification technology, ST1703A ensures long‑term consistency and sustainability across gypsum‑ and cement‑based formulations.
Primary Applications
Landu Novastar™ ST1703A — Hydroxypropyl Starch Ether for High‑Viscosity Mortars
| Property | Specification |
|---|---|
|
Appearance
|
White fine powder
|
|
Viscosity (5 % aqueous)
|
1500 – 4000 mPa·s
|
|
pH (1 % solution)
|
4.0 – 8.5
|
|
Loss on Ignition
|
≤ 10 %
|
|
Moisture Content
|
≤ 10 %
|
|
Particle Size
|
≥ 98 % pass 100 mesh
|
|
Bulk Density
|
500 – 900 g/L
|
|
CAS Number
|
9049‑76‑7
|
Quality Standards
Compliance & certification overview
Global Construction Additive Compliance
Complies with global construction additive requirements across major markets
Consistent Batch‑to‑Batch Viscosity Control
Tight viscosity tolerances maintained across every production batch
ISO‑Certified Manufacturing
ISO‑certified manufacturing and environmental management systems
Optimized for Mechanized Applications
Engineered for high‑performance mechanized and machine spray systems
1500–4000
mPa·s Viscosity
4.0–8.5
pH Range
≥ 98 %
100 Mesh Pass
500–900
g/L Bulk Density
Need the full TDS or MSDS for ST1703A? Our technical team is ready to assist.
Request DocumentsProvides excellent vertical stability even in 30 mm thick layers — keeping mortar firmly in place on walls and overhead surfaces.
Smooth flow during spray and solid structure at rest — ideal shear‑thinning behavior for mechanized application.
Consistent pumpability and spray pattern control for efficient, high‑throughput workflow in mechanized mortar systems.
High viscosity without reducing spreadability or finish quality — reducing installer fatigue and ensuring a uniform surface.
Prevents premature drying and micro‑cracking in large‑area coats by maintaining optimal moisture for cement hydration.
Secure bonding to cement or gypsum substrates for long‑term durability across interior and exterior applications.
Works seamlessly with gypsum, cement and lime binders plus other construction additives — delivering consistent performance across diverse formulation systems without compatibility concerns.
Landu Novastar™ ST1703A Hydroxypropyl Starch Ether in Construction Mortars
Recommended Dosage
% of dry mix by application type
| Application Type | Typical Dosage (% of dry mix) | Range |
|---|---|---|
|
Machine spray mortar
|
0.15 – 0.30 % | |
|
Gypsum plastering
|
0.20 – 0.35 % | |
|
High‑performance putty
|
0.20 – 0.30 % | |
|
Thick‑layer plaster
|
0.20 – 0.40 % |
Contact Landu's technical experts for customized recommendations based on your formulation requirements.
Contact ExpertsDosage Range Overview
Mixing Procedure
Step-by-step preparation
Dry Blend
Dry‑blend ST1703A with other powders until uniform distribution is achieved
Add Water Gradually
Add clean water gradually while mixing continuously at steady speed
Disperse & Hydrate
Mix 3–5 minutes for complete dispersion, then stand 5–10 minutes for hydration
Re‑mix Before Use
Re‑mix briefly before application to restore smooth, consistent workability
Machine Spray Tips
Operational best practices
Water Ratio Adjustment
Adjust mix water for optimal pumpability and anti‑sag balance across varying site conditions
Equipment Pressure Check
Verify nozzle, hose, and pump pressures for steady, uninterrupted flow before operation
Consistent Viscosity
Maintain consistent material viscosity throughout the entire spray operation for uniform output
Storage & Handling
Conditions for optimal shelf life
Temperature
5 – 35 °C
Store in dry conditions
Sunlight & Heat
Avoid Direct
UV and heat degrade quality
Moisture
Keep Dry
Sealed packaging required
Ventilation
Well‑Ventilated
Adequate airflow required
12 Months
Shelf Life
Sealed bags · Ventilated storage · Away from moisture & direct sunlight
Landu Novastar™ ST1703A — Hydroxypropyl Starch Ether for Machine Spray and Plaster Solutions
System 01
Delivering optimized rheology for efficient mechanized operation with consistent output and minimal waste.
System 02
Ensures smoothness and crack‑free surface finish with superior workability and extended open time.
System 03
Provides superb vertical stability and sanding quality for thick layers on interior and exterior walls.
System 04
Ideal for renovation and repair jobs, allowing single layer up to 30 mm without sagging or cracking.
All formulations are reference guidelines. Actual dosages may vary based on substrate conditions, climate and project requirements. Contact Landu's technical team for customized formulation support.
| Product | Viscosity (mPa·s) | Ash (%) | Anti‑Sagging | Best For |
|---|---|---|---|---|
|
ST1703A
This Product
|
1500 – 4000 | ≤ 10 | Machine spray / thick layer plastering | |
| ST2109 | 1000 – 5000 | ≤ 10 | Specialty machine spray | |
| ST2442 | 2000 – 5000 | ≤ 12 | Multi‑functional cement/gypsum systems | |
| ST1403B | 500 – 1000 | ≤ 12 | Manual gypsum/putty | |
| ST1506A | 500 – 3500 | ≤ 12 | Universal applications |
Optimize Hydroxypropyl Starch Ether for Mechanized Use
Reliable international packaging and logistics for Hydroxypropyl Starch Ether — designed for efficient global delivery with flexible volume options.
2–3 Weeks
Lead Time
Volume Discount
Available on request
Global
International shipping
Our specialists assist in formula tuning, equipment setup, and rheology optimization for efficient mechanized operations.
Landu Technical Team
HPS & Machine Spray Specialists
Sales@landu‑china.com
Phone
+86 531 6995 9221
Response within 24 hours · Mon–Fri 9:00–18:00 CST
Hydroxypropyl Starch Ether (HPS) — Frequently Asked Questions
ST1703A's optimized viscosity range (1500–4000 mPa·s) and excellent thixotropic properties provide ideal pumpability while maintaining superior anti-sagging performance on vertical surfaces.
Typically 0.15–0.3% by weight of dry mix. The exact dosage depends on your specific formulation, equipment, and desired performance. Contact our technical team for customized recommendations.
Yes, ST1703A performs excellently in manual applications, particularly where superior anti-sagging properties are required for thick-layer or vertical surface work.
ST1703A has a viscosity range of 1500–4000 mPa·s, while ST2109 ranges from 1000–5000 mPa·s. ST1703A is optimized for workability enhancement, while ST2109 is specialized for machine spray with highest viscosity options.
ST1703A can support layer thickness up to 30mm in thick-layer plastering applications, though optimal thickness depends on specific formulation and substrate conditions.
Yes, ST1703A's pH range (4.0–8.5) ensures excellent compatibility with both gypsum-based and cement-based systems.
Yes, ST1703A enhances adhesion to various substrates through improved water retention and optimized rheology, reducing risk of delamination.
ST1703A is compatible with various spray equipment including continuous spray machines, piston pumps, screw pumps, and rotor-stator mixers.
Yes, we provide samples for qualified customers. Please contact our sales team with your company information and application details.
Explore the full Hydroxypropyl Starch Ether portfolio for every application
Machine Spray Specialist HPS
Engineered for continuous spray machines with superior pumpability and anti-sagging on vertical surfaces.
Multi-Functional High-Performance HPS
Versatile high-viscosity grade covering tile adhesive and plaster systems in one solution.
Universal Application HPS
Broad-spectrum performance across multiple dry-mix mortar applications and substrates.
Versatile Manual Use HPS
Optimized for hand-applied mortars with excellent workability and consistent open time control.
Ask our team how ST1703A can enhance your machine spray systems and vertical applications through optimized rheology and consistent performance.
