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Universal Construction Additive
ISO 9001 Certified
Eco-Certified Innovation

Landu Novastar™

Hydroxypropyl
Starch Ether (HPS)

Model ST1506A

Universal Construction Additive

Versatile Performance · Reliable Workability · Sustainable Polymer from Plant Sources
Download TDS Request Sample Contact Technical Support

Core Highlights

Wide Viscosity Range

500 – 3500 mPa·s for flexible mortar formulation control

500–3500 mPa·s

Universal Mortar Compatibility

Suitable across gypsum, putty, tile adhesive and EIFS systems

Universal

Excellent Workability & Spreadability

Consistent open time and smooth surface finish on application

Superior Water Retention & Anti‑Sagging

Reliable vertical stability and hydration support for curing

Anti-Sag
Novastar ST1506A Hydroxypropyl Starch Ether product sample
Novastar™ ST1506A
Universal Grade
Plant-Derived & Sustainable
500 – 3500 mPa·s
Product Overview

Novastar™ ST1506A Hydroxypropyl Starch Ether Additive

Universal Grade Starch Ether for Multi‑System Gypsum and Putty Applications

Novastar™ ST1506A is Landu's universal‑grade Hydroxypropyl Starch Ether (HPS) designed for broad application in modern construction mortars.

With its adaptable viscosity profile and superior compatibility, it enhances workability, water retention, and anti‑slump properties across gypsum‑based, lime‑calcium, and hand‑applied plastering systems.

Derived from renewable plant resources via advanced etherification and modification, ST1506A offers consistent performance and environmental sustainability.

Primary Applications
  • 01
    Gypsum and Calcium Putty Formulations
  • 02
    Lime‑Calcium Wall Finishing Systems
  • 03
    Hand‑Applied Plastering and Interior Mortars
Technical Specifications

Landu ST1506A Hydroxypropyl Starch Ether

Product Data Sheet
Property Specification
Appearance White fine powder
Viscosity (5% aqueous solution) 500 – 3500 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
Quality Assurance
Certified Manufacturing Standards
  • ISO 9001 & 14001 Manufactured under certified quality & environmental management systems
  • Batch Integrity Consistent quality verified by advanced QC protocols on every production run
  • Industry Compliance Fully compliant with international construction additive standards
ISO 9001
ISO 14001
Eco-Friendly
Performance Advantages

Landu Novastar™ ST1506A Hydroxypropyl Starch Ether

Enhanced Workability Water Retention Open Time Surface Finish
Construction worker applying mortar plaster on wall
Professional-Grade Performance
6
Key Benefits
pH 4–8.5
Neutral Range
Improved Workability
Enhances mortar spreadability and troweling ease, boosting on‑site efficiency.
Superior Water Retention
Provides stable moisture control for optimal hydration and anti‑cracking.
Anti‑Sagging Control
Delivers thixotropy balance for smooth vertical application.
Extended Open Time
Offers longer adjustment period for tile adhesive and plaster finishing.
Smooth Finish
Produces uniform, defect‑free decorative surfaces with improved adhesion.
Formulation Compatibility
Neutral pH (4.0–8.5) suits gypsum, cement, and lime systems.
Application Guidelines

Novastar™ ST1506A

Starch Ether — Dosage & Mixing Reference

Recommended Dosage
Application Dosage (% by dry mix)
Gypsum Putty 0.10 – 0.30 %
Lime–Calcium Putty 0.15 – 0.35 %
Hand Plastering 0.10 – 0.25 %
For optimized performance, consult Landu's technical service team.
Mixing Steps
01
Dry Blend
Dry-blend ST1506A with other powders evenly.
02
Add Water
Gradually add water while stirring.
03
Mix 3–5 min
Mix until uniform consistency.
04
Rest 5–10 min
Hydrate, then re-mix before use.
Storage & Safety
Storage & Handling
  • Dry, ventilated place (5–35 °C)
  • Keep sealed against moisture
  • Shelf life 12 months
Safety
  • Wear mask and gloves
  • Avoid dust inhalation
Construction System Applications

Novastar™ ST1506A Application Guide

Hydroxypropyl Starch Ether — Engineered for versatile performance across major mortar systems

Gypsum-Based Putty Application
01
Gypsum System

Gypsum‑Based Putty Systems

Improves water retention and surface appearance, delivering a smooth finish with reduced cracking risk and extended open time for professional results.

Smooth application
Less cracking
Longer open time
Typical Formula
Gypsum 70–80% CaCO₃ 15–25% HPS 0.15–0.25%
Learn More
Lime-Calcium Putty Formulation
02
Lime–Calcium System

Lime–Calcium Putty Formulations

Provides outstanding workability and anti-slump support in lime-calcium systems, ensuring consistent spreadability and a longer working window on vertical surfaces.

Smooth application
Anti-slump support
Extended open time
Typical Formula
Ca(OH)₂ 20–30% CaCO₃ 65–75% HPS 0.20–0.30%
Learn More
Hand Plastering Mortar
03
Plastering Mortar

Hand Plastering Mortars

Optimizes mortar consistency and substrate adhesion for hand plastering applications, improving pumpability, reducing material waste, and enhancing long-term durability.

Improved pumpability
Less material waste
Better durability
Typical Formula
Binder 30–50% Sand 45–65% HPS 0.10–0.20%
Learn More
Dosage recommendations are indicative. Final formulations should be validated through laboratory trials under specific project conditions.
Technical Comparison

Novastar™ ST1506A vs Other Landu Grades

A side-by-side technical overview of Landu's hydroxypropyl starch ether product line — helping you select the right grade for every application.

Grade Comparison Matrix
Product Viscosity (mPa·s) Ash Content Recommended Use
★ ST1506A Featured
View Details
500 – 3500 ≤ 12% Universal multi‑system applications
ST1403B View Details
500 – 1000 ≤ 12% Basic putty / low viscosity mixes
ST1703A View Details
1500 – 4000 ≤ 10% Machine spray / high thixotropy
ST3547 View Details
200 – 1500 ≤ 8% Economy grade / low ash system
Why ST1506A Excels
Broad Viscosity Flexibility
Wide 500–3500 mPa·s range supports custom formulation designs across diverse mortar systems.
Stable Quality & Reliability
Consistent batch-to-batch performance ensures dependable results in large-scale production environments.
Cost‑Effective Performance
Optimal balance of performance and value, delivering premium results without premium overhead costs.
Dedicated Technical Support
Backed by Landu's team of technical experts, providing formulation guidance and on-site application assistance.
All viscosity and ash content values are measured under standard laboratory conditions. Contact Landu technical support for application-specific grade recommendations.
Quality Assurance

Landu Novastar
HPS Additives

Built on rigorous manufacturing standards and internationally recognised certifications — every batch of ST1506A meets the highest performance benchmarks.

Advanced Manufacturing & Testing

  • State-of-the-art etherification technology
  • Automated control for consistency and traceability
  • Sustainable raw materials from renewable sources

Certifications

  • ISO 9001 | ISO 14001 Certified
  • Compliant with construction chemical standards
  • Third-party validation for key performance criteria
ISO 9001
ISO 14001
3rd-Party Validated
Construction Standard
Technical Support

Landu Hydroxypropyl
Starch Ether Experts

Our application engineers provide formulation consulting, performance testing, and on-site support to help you maximize the benefits of ST1506A.

Formulation Consulting
Performance Testing
On-Site Support
Get in Touch
Response within 24 hours
Email
Sales@landu-china.com
Phone
+86 531 6995 9221
Available — Typically replies within 24 hours
Packaging & Logistics

Novastar ST1506A
Hydroxypropyl Starch Ether

Packaging
25 ± 0.2 kg / bag
PE liner + valve outer, moisture-proof sealed
Pallets & Bulk
Export Ready
Pallet stacking & bulk options available for shipping
Delivery
2 - 3 Weeks
Standard lead time with worldwide supply coverage
Custom Offers
Tailored Solutions
Custom packaging available for high-volume orders
FAQ

ST1506A Common Questions

Everything you need to know about Novastar ST1506A — answered clearly.

Q What is the typical dosage for gypsum putty?
Around 0.1 – 0.3% by weight; final dosage depends on desired performance.
Q Is it applicable in cement systems?
Yes. Its pH (4.0 – 8.5) ensures good compatibility with cementitious formulations.
Q How should it be stored?
In dry, ventilated areas below 35 °C; protect from moisture. Shelf life: 12 months.
Q Is it compatible with other additives?
Fully compatible with cellulose ethers, RDP powders, and most construction modifiers.
Q Main difference from ST1403B?
ST1506A has a broader viscosity range (500 – 3500 vs 500 – 1000 mPa·s) for greater flexibility.
Q Can I get a sample?
Samples are available for qualified customers — please contact sales with project details.
Related Products

Novastar™ HPS Ether Range

ST1403B
Versatile Performance
Balanced viscosity range (500–1000 mPa·s), ideal for standard mortar applications.
Learn More
ST1703A
Workability Enhanced
Optimised for superior workability and open time in tile adhesives and renders.
Learn More
ST3547
Economy Grade
Cost-effective solution for large-volume projects without compromising core performance.
Learn More
View All Landu Novastar™ Products
Get Started

Get Novastar ST1506A Today

Enhance your mortar formulations with Landu's sustainable construction additive — trusted by formulators worldwide.

Sales@landu‑china.com
+86 531 6995 9221
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