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Premium Gypsum Solutions

LANDU Gypsum Additives

Cellulose Ethers RDP Retarders

LANDU is a trusted manufacturer of high-performance cellulose ethers (CE), redispersible polymer powders (RDP), and gypsum retarders. Our additives are engineered to improve workability, adhesion, sag resistance, and crack prevention for both hand-applied and machine-applied gypsum systems.

Hand-Applied Systems
Machine-Applied Systems
Interior Finishing
Additives Range: CE / RDP / Retarders
Application: Gypsum Systems
Enhanced Workability
Smooth application
Superior Adhesion
Strong bonding
Sag Resistance
Vertical stability
Crack Prevention
Long-term durability
Optimized Water Retention
Controlled Setting Time
Excellent Surface Finish
Enhanced Mechanical Strength

What Are Gypsum Additives?

Gypsum additives such as HPMC, HEMC, RDP, and gypsum retarders are essential for high-quality plaster, jointing, and trowelling compounds.

Cellulose Ether
CE

Cellulose Ether

Improves water retention, prevents rapid drying, and enhances workability. Ensures smooth application and reduces tool sticking.

Water Retention
Enhanced Workability
Smooth Application
Learn More →
Redispersible Polymer Powder
RDP

Redispersible Polymer Powder

Enhances adhesion, flexibility, and long-term durability.

Superior Adhesion
Enhanced Flexibility
Long-term Durability
Learn More →
Gypsum Retarder
Retarder

Gypsum Retarder

Controls setting time for consistent workability and curing.

Controlled Setting Time
Consistent Workability
Optimized Curing
Learn More →

Key Benefits

Smooth, crack-free surfaces
Superior workability and spreadability
Excellent anti-sagging performance
Enhanced adhesion and structural integrity

Typical Applications of Gypsum Additives

01

Hand-Applied & Machine-Applied Plaster

Hand-applied plasters for small areas, renovations, or touch-ups
Machine-applied plasters for continuous mixing and application (typical thickness ~10mm)
Hand-Applied & Machine-Applied Plaster
Trowelling Compounds
02

Trowelling Compounds

Level uneven walls or ceilings
Smooth, paintable finishes
Ideal for plasterboards, concrete walls, or gypsum ceilings
03

Joint Filling & Adhesives

Fill gaps between gypsum boards
Secure mounting of plasterboards on masonry
Maintain structural integrity of walls, especially in renovation projects
Joint Filling & Adhesives
Gypsum-Based Mortars
04

Gypsum-Based Mortars

Interior and exterior plaster systems
High water-cement ratio mortars
Decorative or structural gypsum applications

Advantages of LANDU Gypsum Additives

01

Water Retention & Full Hydration

Minimizes moisture loss and prevents rapid surface drying
Ensures complete gypsum hydration for optimal strength
02

Improved Workability & Anti-Sagging

Smooth application with controlled viscosity
Prevents sagging even in thick layers
03

Crack Resistance

Uniform hydration reduces shrinkage stress
Prevents microcracks for long-lasting finish
04

Enhanced Adhesion & Durability

RDP improves bonding to substrates
Gypsum retarders ensure consistent set times
05

Cost Efficiency & Higher Yield

Optimized water retention reduces gypsum powder usage
Maintains workability for large-scale applications

Selection Guide – Recommended Products

Landercoll Cellulose Ether

Landercoll®

Cellulose Ether

Product Recommended Application Performance
HEMC EM100 Hand-Applied Plaster / Gypsum Putty Excellent water retention, smooth application, extended open time
Novastar Gypsum Retarder

Novastar™

Gypsum Retarder

Grade Application
P300 Gypsum-based systems for controlled setting time

Accurate™

Redispersible Polymer Powder (Optional)

Three specialized formulations for different performance requirements

Accurate 5011N Rigid
Rigid
5011N

Maximum Structural Strength

Enhanced adhesion to substrates
Superior structural integrity
Ideal for load-bearing applications
Best For: Heavy-duty gypsum systems
Accurate 4025N Semi-flexible
Semi-flexible
4025N

Balanced Performance

Optimal flexibility for crack prevention
Maintains structural stability
Versatile for various substrates
Best For: General-purpose applications
Accurate 5045N Flexible
Flexible
5045N

Ultimate Flexibility

Maximum crack resistance
Superior durability in movement zones
Excellent for dynamic substrates
Best For: High-movement areas

Recommended Combination for Optimal Gypsum Performance:

HEMC EM100 + Gypsum Retarder P300 + RDP (Choose based on application)

Why Choose LANDU?

Experience

Over a decade of experience in construction chemical additives

Certification

ISO 9001 certified and EU REACH compliant

R&D Laboratory

Advanced R&D laboratories for formula optimization

Global Supply

Global supply capabilities and reliable logistics

Free Sample & Technical Support

Experience the performance of LANDU Gypsum Additives before purchasing:

Free samples (200g–600g) of HEMC EM100, RDP 5011N, Gypsum Retarder P300
Technical data sheets (TDS) and application guides included
Formula recommendations and expert guidance for customized gypsum solutions
Free Sample Package
Free Shipping
Expert Support

FAQ – Gypsum Additives

Common questions about LANDU gypsum additives and their applications

Q1

What is the difference between HPMC and HEMC in gypsum applications?

HEMC is preferred for hand-applied plaster and gypsum putty due to higher water retention and extended open time. HPMC is ideal for machine-applied plasters and general leveling compounds.

Q2

How do gypsum retarders like P300 help?

They control the setting time, preventing rapid hardening and ensuring smooth application and workability.

Q3

Can RDP powders be combined with cellulose ethers?

Yes. RDP + HEMC improves adhesion, flexibility, and crack resistance.

Q4

How should I store gypsum additives?

Keep in a cool, dry place, away from moisture and direct sunlight. Proper storage ensures consistent performance.

Q5

Are LANDU gypsum additives suitable for renovations?

Absolutely. Our joint fillers, trowelling compounds, and hand-applied plasters are ideal for renovation projects and small-scale applications.

Q6

Can LANDU assist with custom formulations?

Yes. Our technical team can provide tailored solutions, dosage guidance, and compatibility testing.

Q7

Do LANDU gypsum additives improve crack resistance?

Yes. Proper combination of HEMC + RDP + Gypsum Retarder reduces shrinkage stress and prevents microcracks.

Q8

How fast can I receive my order?

LANDU provides fast global delivery via FedEx or DHL for both small and bulk orders.

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