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Landu Novastar™  ·  HPS Additive Solutions

Ultra‑Smooth Finish for Perfect Interior Walls

Professional Hydroxypropyl Starch Ether (HPS) engineered for lime‑calcium putty systems — delivering exceptional workability, brilliant whiteness, and long‑lasting crack resistance for interior wall applications worldwide.

✓ Excellent Workability ✓ Superior Whiteness ✓ Easy Sanding ✓ Crack Resistance
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HPS Standard Grade HPS

HPS Standard Grade

Powder form for putty, plaster & coating systems
Crack-Resistant Formula CR+

Crack‑Resistant Formula

High-flex additive for renovation & new build walls
Ultra-White Series UW

Ultra‑White Series

Whiteness index ≥98%, easy sanding & smooth finish
Certified & Trusted
ISO 9001 & 14001 REACH Compliant Full Traceability 60+ Countries Fortune 500 Clients 24/7 Technical Support
Landu Novastar™ HPS Series
Landu Novastar HPS Hydroxypropyl Starch Ether product Hydroxypropyl Starch Ether

Hydroxypropyl Starch Ether

Professional-grade HPS additive engineered for lime‑calcium putty, tile adhesive, and interior finishing systems.

Powder Form 50% Liquid ISO Certified
1–2 mm Coat
98% Whiteness
A+ Workability
Product Knowledge  ·  Landu Novastar™

What Is
Lime‑Calcium Putty?

Lime‑calcium putty is a fine finishing compound applied in thin coats (1–2 mm) to produce ultra‑smooth, paint‑ready interior surfaces. As the final visible layer, its quality directly determines aesthetic appearance and long‑term durability.

1–2 mm Coat Thickness
98% Whiteness Index
0 Crack Rate
A+ Workability

Why Landu Novastar™ HPS Matters

Smooth, Easy Application

Optimized rheology for effortless spreading across all interior surfaces

✓

Excellent Water Retention

Prevents premature drying and cracking — extends open time for rework

✓

Anti‑Sagging on Vertical Sections

Maintains uniform coat thickness on walls and ceilings without slumping

✓

Improved Sandability & Final Finish

Delivers a paint‑ready surface with minimal sanding effort required

✓

Cost‑Effective Performance

Low dosage rate delivers high-impact results — reduces total formulation cost

✓
Explore HPS Products Download TDS
Application Guide  ·  Landu Novastar™ HPS

Application Types — HPS in Lime‑Calcium Putty Formulations

Interior wall putty application — smooth plastering on residential wall Interior Finishing
Standard Interior Putty Residential & Commercial Projects
Standard Interior Residential Commercial

Interior Wall Putty
with Landu Novastar™ HPS

  • ✓ Smooth consistency and easy troweling
  • ✓ Whiteness ≥ 80%  |  Quick sanding
  • ✓ Economical formulation for large-scale projects

Recommended HPS Grades

ST1403B ST1506A ST3547 Dosage: 0.18 – 0.25%
Learn More Sample Formulation
Application Guide  ·  Landu Novastar™ HPS

Premium Putty Systems — HPS for Luxury Finishes

High‑End Interiors Ultra‑Smooth Bright White

Premium Putty Systems
with Landu Novastar™ HPS

  • ✓ Enhanced whiteness ≥ 85% — brilliant, paint‑ready surface
  • ✓ Excellent workability — effortless spreading and leveling
  • ✓ Superior durability — long‑term crack resistance and adhesion

Recommended HPS Grades

ST1403B ST1703A Dosage: 0.22 – 0.28%
Learn More Sample Formulation
Premium luxury interior wall finish — ultra-smooth bright white plastering
Premium Grade
High‑End Interior Putty Ultra‑Smooth & Bright White Finish
≥85% Whiteness
Exterior Wall Weather‑Resistant 5–10 Year Durability

Exterior Wall Putty —
Weather‑Resistant Performance
by Landu Novastar™ HPS

  • ✓ Superior weather and water resistance — shields exterior surfaces from rain, UV, and thermal cycling
  • ✓ Excellent crack control and durability — engineered for a service life of 5 – 10 years

Recommended HPS Grades

ST1703A ST2442 Dosage: 0.25 – 0.35%
Learn More Sample Formulation
Exterior wall putty application — weather-resistant coating on building facade Exterior Finishing
Weather‑Resistant Putty 5 – 10 Year Service Life
Flexible putty application on movement-prone substrate with crack bridging capability Flexible Finishing
Crack‑Bridging Putty Interior & Exterior Use
Flexible Putty Crack‑Bridging Interior & Exterior

Flexible Putty Formulations —
Enhanced Crack‑Bridging
by Landu Novastar™ HPS

  • ✓ Designed for movement‑prone substrates — delivers reliable crack bridging capability where surfaces shift or flex
  • ✓ High flexibility with lasting durability — engineered for both interior and exterior applications without compromise

Recommended HPS Grades

ST1506A ST1703A Dosage: 0.22 – 0.30%
Learn More Sample Formulation
Ready-mix paste putty application — convenient pre-mixed formula for DIY and retail use Ready‑Mix Paste
Pre‑Mixed Paste Putty 6 – 12 Month Shelf Life
Ready‑Mix Putty Pre‑Mixed Formula DIY & Retail

Ready‑Mix Paste Putty —
Convenient Solutions
by Landu Novastar™ HPS

  • ✓ Pre‑mixed formula with consistent quality — ready to use straight from the container, eliminating on‑site mixing errors
  • ✓ Extended shelf life of 6 – 12 months — ideal for DIY users and retail distribution with reliable long‑term storage

Recommended HPS Grades

ST1403B ST1506A Dosage: 0.15 – 0.22%
Learn More Sample Formulation
Performance Data

Landu Novastar™ · in Putty Applications

Key Performance Benefits

HPS Hydroxypropyl Starch Ether

Six critical performance dimensions — how Landu Novastar™ HPS elevates every stage of the putty system

#
Performance Aspect
Landu HPS Contribution
01
Workability Application
Smooth, creamy consistency for easy troweling and high efficiency
02
Water Retention Curing
Prevents premature drying, reduces cracking
03
Anti‑Sagging Stability
Controls flow for uniform vertical application
04
Whiteness Aesthetics
Low ash content supports 80–90% brightness
05
Sanding Ease Finishing
Optimized surface hardness for easy finishing
06
Crack Resistance Durability
Improved cohesion and controlled drying for long‑term durability
6 Performance Dimensions · Landu Novastar™ HPS Putty System
EN 13963 ISO 9001 Premium Grade
80–90% Brightness Range
6 Aspects Performance Coverage
Dual Use Interior & Exterior
0.15–0.35% Dosage Range
Product Selector · Lime-Calcium Putty

Landu Novastar™ · Hydroxypropyl Starch Ether

HPS Grades for
Lime‑Calcium Putty

Four carefully selected grades matched to viscosity, ash content, and dosage requirements — from economy to high-performance exterior systems.

4 Grades Available · Dosage 0.18 – 0.35% · Max Ash ≤ 12%
View Product Details Request Sample
ISO 9001 REACH Premium
4 Grades
≤12% Max Ash
0.35% Max Dose
ST1403B Putty Specialist

Excellent workability, optimized for lime‑calcium putty systems

Viscosity 500 – 1000 mPa·s
Ash Content ≤ 12%
Typical Dosage 0.18 – 0.28%
View Details Request Sample TDS / SDS
ST1506A Universal

Universal grade with wide viscosity range for flexible formulation use

Viscosity 500 – 3500 mPa·s
Ash Content ≤ 12%
Typical Dosage 0.18 – 0.30%
View Details Request Sample TDS / SDS
ST1703A High Perf.

High performance, weather resistant — ideal for demanding exterior applications

Viscosity 1500 – 4000 mPa·s
Ash Content ≤ 10%
Typical Dosage 0.22 – 0.35%
View Details Request Sample TDS / SDS
ST3547 Economy

Cost‑effective economy grade with low ash content for budget‑conscious formulations

Viscosity 200 – 1500 mPa·s
Ash Content ≤ 8%
Typical Dosage 0.18 – 0.25%
View Details Request Sample TDS / SDS
Dosage may vary based on substrate condition, ambient temperature, and formulation design. Contact our technical team for application‑specific recommendations.
Formulation Guide

Quick

Formulation Guide

Develop Putty with Landu Novastar™

HPS Construction Additives

Three reference formulations covering interior, premium, and exterior putty systems — each optimised for workability, adhesion, and durability.

3 Formulations
6+ Ingredients
HPS Core Additive
Interior

Standard Interior Putty

Standard
CaCO₃ Base filler
50 – 65%
White Cement Binder
8 – 15%
HPS ST1403B Workability · Water retention
0.20 – 0.25%
HPMC Thickener
0.08 – 0.12%
RDP Adhesion · Flexibility
1.5 – 2.5%
Premium

Premium Putty

Premium
CaCO₃ Base filler
55 – 70%
TiO₂ Whiteness · Opacity
2 – 5%
HPS Workability · Water retention
0.22 – 0.28%
HPMC Thickener
0.10 – 0.15%
RDP Adhesion · Flexibility
2.5 – 4%
Exterior

Exterior Putty

Weather Resistant
CaCO₃ Base filler
45 – 60%
White Cement Binder · Strength
15 – 25%
HPS ST1703A Workability · Weather resistance
0.25 – 0.35%
RDP Adhesion · Flexibility
4 – 6%
Hydrophobic Additives Water repellency
0.2 – 0.4%
Fiber Crack resistance
0.1 – 0.3%
Complete Formulation Guide Full technical specifications, mixing ratios, and application instructions
Download Complete Formulation Guide
Application Guide

Best Practices

Application Tips

Get the best results with Landu Novastar™

HPS‑Modified Putty

Three essential stages — substrate, mixing, and application — plus a quick-reference troubleshooting guide for the most common on-site issues.

3 Stages
3 Issues Solved
HPS Core Additive
Step 01

Substrate Preparation

Pre‑Work
1
Clean the surface Remove all dust, oil, grease, and loose particles before application.
2
Ensure sound substrate Check for cracks or delamination; repair any structural defects first.
3
Prime porous bases Apply a suitable primer to highly absorbent surfaces to prevent rapid moisture loss.
Step 02

Mixing — Powder Putty

Mixing
1
Add powder to water Always add powder into water — not the reverse — to ensure uniform dispersion.
2
Mix 5 – 10 min Use a mechanical mixer at low speed until a smooth, lump-free paste is achieved.
3
Stand, then re-mix Allow to stand for 3–5 min so HPS fully hydrates, then briefly re-mix before use.
Step 03

Application

Apply
1
Layer thickness 1 – 2 mm Apply each coat at 1–2 mm for optimal adhesion and crack-free drying.
2
Dry 4 – 24 h between coats Allow full surface drying between layers; time varies with temperature and humidity.
3
Sand after 24 – 48 h Once fully cured, sand with 120–180 grit for a smooth, paint-ready finish.
Troubleshooting Common Issues & Solutions
Cracking
Increase HPS dosage to improve water retention
Raise HPMC content for better cohesion
Add fiber reinforcement to the formulation
Poor Adhesion
Improve substrate prep — clean and prime surface
Increase RDP dosage for stronger bond
Apply bonding primer on highly porous substrates
Sagging
Raise HPS dosage to increase sag resistance
Switch to a higher viscosity HPS grade
Reduce layer thickness per coat to under 2 mm
Download Application Guide Full technical instructions, mixing ratios, and troubleshooting reference
Download Application Guide
Case Studies

Real-World Results

Success Stories

Lime‑Calcium Putty with Landu Novastar™

Hydroxypropyl Starch Ether

Three verified projects — from large-scale residential to demanding coastal facades — demonstrating measurable performance gains with Landu Novastar HPS.

3 Projects
3 yr Proven Life
88% Whiteness
Modern high-rise construction site with scaffolding and facade work

Proven in the Field

From 1,200‑unit residential blocks to coastal facades — zero defects, on time.

Residential Commercial Exterior Facade
Large residential apartment complex under construction
Residential
Case Study 01

1,200‑Unit Residential Development

ST1403B 0.22%
Zero surface defects across all units and on-time delivery — no rework required.
Zero defects · On-time delivery
Premium office tower interior with white polished walls
Commercial
Case Study 02

Premium Office Tower

ST1403B + TiO₂ 88% White
ST1403B + TiO₂ boost achieved 88% whiteness — a showroom-grade finish approved by the client on first inspection.
88% whiteness · Showroom-grade
Coastal building exterior facade with ocean view
Exterior Facade
Case Study 03

Coastal Exterior Facade

ST1703A 0.32% 3 yr ✓
ST1703A at 0.32% — no cracks detected after 3 years of full coastal weather exposure.
No cracks · 3 years exposure
Read Full Case Studies Detailed project specs, formulation data, and performance test results
Read Full Case Studies
Resources & Support

Landu Novastar™ HPS

Technical Resources & FAQ

Hydroxypropyl Starch Ether — Lime‑Calcium Putty Formulators

Downloads & Media Technical Resources
Frequently Asked Questions FAQ — HPS in Putty Systems
Typical dosage is 0.18 – 0.35% depending on putty type — interior standard grades use the lower end, while premium or exterior systems may require up to 0.35%.
ST1403B is the recommended grade for standard interior putty — it delivers excellent workability, smooth troweling, and reliable water retention at dosages of 0.18–0.28%.
Yes. HPS can partially replace HPMC in putty formulations, typically achieving a 10–20% cost saving on cellulose ether while maintaining or improving workability and water retention performance.
Add TiO₂ to the formulation and select ST3547 — its low ash content (≤ 8%) minimises discolouration, supporting whiteness levels of 80–90%+.
Increase HPS and HPMC dosages to improve water retention and cohesion, add fiber reinforcement to the mix, and always apply in thin coats (1–2 mm) to control drying stress.
Landu Novastar™ HPS — Technical Support

Have a Question? We're Here to Help.

Grade selection · Dosage optimization · Formulation support · Sample requests

Landu laboratory flowability performance test
Lab Testing Flowability & Performance Analysis
Formulation R&D specialists
Our Team Formulation R&D Specialists
HPS application testing
Application HPS Grade Performance Testing
Quality assurance process
Quality ISO-Certified QA Process
Email info@landu.com
Phone +86 531 6995 9221
Office Hours Mon–Fri · 08:00–18:00 CST
Location Landu Industrial Park, China
Grade Selection Dosage Optimization Formulation Support Sample Requests TDS & SDS Docs Lead Time Inquiry
Talk to a Formulation Expert Personalized guidance — no commitment required
Response within 24 hours — our technical team replies fast on every inquiry
Free sample available — test HPS performance in your own formulation lab
Custom dosage guidance — tailored recommendations for your specific substrate
Contact Our Technical Team
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Lead Time Dosage Guide SDS / Safety
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