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Waterproof Mortar Additives

LANDU Construction Chemicals

High‑Performance Polymer Additives for Cementitious Waterproofing Systems

What Is Waterproof Mortar?

Waterproof mortar is a cement‑based mixture designed to prevent moisture penetration while maintaining strong adhesion and durability. Commonly used in basements, bathrooms, water tanks, swimming pools, and exterior walls, it forms a dense layer that resists water ingress.

Advanced Formula

Unlike ordinary mortar, waterproof mortar contains functional chemical additives—such as cellulose ether (HPMC / MHEC), redispersible polymer powder (RDP), and polycarboxylate superplasticizer (PCE)—that enhance impermeability, flexibility, and long‑term strength.

Basements

Bathrooms

Water Tanks

Swimming Pools

Exterior Walls

Waterproof Mortar Application

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Proven Performance Professional Grade

Impermeability

Blocks moisture penetration

Flexibility

Resists cracking & movement

Long-Term Strength

Durable protection

Why Additives Matter in Waterproof Mortar

Performance additives are crucial for achieving a truly waterproof, crack‑resistant mortar. They modify the cement matrix to improve bonding, flexibility, and surface durability.

01

HPMC / MHEC

Cellulose Ether

• Retains moisture for full cement hydration
• Improves workability, viscosity, and anti‑sag performance
• Extends open time for convenient application
• Enhances adhesion strength and surface consistency

02

RDP

Redispersibel polymerpulver

• Boosts tensile and bonding strength
• Provides flexibility and crack resistance
• Increases hydrophobicity and weather durability
• Enhances film formation for long‑lasting waterproof layers

03

PCE

Polycarboxylate Ether Superplasticizer

• Reduces water demand without affecting workability
• Increases mortar density and cohesion
• Improves impermeability by minimizing capillary pores
• Enhances flow for easier application and compaction

Versatile Solutions

Applications of Waterproof Mortar Additives

LANDU additives are designed for modern cementitious waterproofing applications, including:

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Swimming Pools

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Basements

Fuktbeskyttelse

Bathrooms

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Water Tanks

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Exterior Walls

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LANDERCOLL HPMC K200

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Viktige fordeler:

✓ Excellent water retention for complete hydration
✓ Anti‑sag and easy troweling on vertical applications
✓ Extended open time and smooth application flow
✓ Improved bonding on porous and non‑porous surfaces

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ACCURATE RDP 8035H

ACCURATE™ RDP 8035H

Hydrofobisk Redispersible Polymer Powder

Flexible, Durable, and Water‑Resistant Polymer Additive

ACCURATE™ 8035H RDP enhances mortar flexibility and adhesion while imparting superior hydrophobic properties. It is widely recommended for exterior coatings, bathroom walls, and waterproof plaster formulations.

Viktige fordeler:

✓ Outstanding waterproof and crack‑resistant performance
✓ Improved tensile and flexural strength
✓ Enhanced flexibility for deformation resistance
✓ Excellent dispersion and film formation

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LANDU PCE 570P

LANDU PCE 570P

High‑Range Polycarboxylate Superplasticizer

For High‑Density, Impermeable Mortar Systems

LANDU PCE 570P reduces water demand while increasing flowability and compactness. It helps create high‑density mortars with superior impermeability and cohesion.

Viktige fordeler:

✓ Increased strength at lower water‑cement ratios
✓ Improved self‑leveling and pumpability
✓ Reduced shrinkage and porosity
✓ Enhanced long‑term waterproofing durability

04

NOVASTAR Silicone Hydrophobic Powder

NOVASTAR™ Silikon Hydrofobisk Pulver

SHP - Surface Water Repellency

Surface Water Repellency & Efflorescence Control

NOVASTAR™ SHP forms a protective hydrophobic barrier inside the mortar matrix, preventing water absorption and minimizing efflorescence.

Viktige fordeler:

✓ Excellent water repellency in wet areas
✓ Protection against salt formation and discoloration
✓ Improved freeze‑thaw resistance for outdoor use

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LANDU Defoamer Powder

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Air Elimination Additive

Air‑Free, Smooth Surface Finish

Defoamer minimizes air entrapment during mixing for a dense, uniform surface—essential for decorative waterproof mortars.

Viktige fordeler:

✓ Prevents pinholes and voids
✓ Enhances compressive strength
✓ Provides compact, aesthetic finishes

Recommended Dosage Guidelines

Tilsetjeføremiddel	Typical Dosage Range	Application Remarks
HPMC / MHEC	0.2 – 0.5 % by cement weight	Improves water retention and open time
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PCE 570P	0.3 – 0.8 %	Reduces water demand for denser mortar
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Defoamer	0.05 – 0.2 %	cURL Too many subrequests.

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LANDU Manufacturing Facility

20+ Years

75K Tons/Year

Industry Leader

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Try Before You Buy

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Request Free Samples Today

Test LANDU additives directly in your waterproof mortar formulations to validate performance before ordering in bulk.

Sample Package Includes:

200 – 600 g of requested products
Product brochure and TDS (Technical Data Sheet)
Dosage and formulation guidance
Customized support from LANDU R&D engineers

Why Try LANDU Samples?

✓ Test product compatibility and waterproofing efficiency

✓ Optimize dosage based on your material system

✓ Receive guidance for max adhesion, density, and hydrophobicity

Request Your Free Sample Now

Global Express Delivery via FedEx / DHL

Get Free Sample →

LANDU gratis prøve

Gratis prøvar Available Worldwide

LANDU Technical Support

R&D Labs State-of-the-Art

Expert Assistance

LANDU Technical Support & R&D Capabilities

Two State‑of‑the‑Art Laboratories

for formulation improvement and application testing

Professional Technical Guidance

for waterproof systems and cementitious coatings

Customized Product Development

based on local material analysis and performance benchmarks

Dedicated After‑Sales Service

to ensure seamless production integration

Contact Technical Team →

Schedule Consultation

Common Questions

Vanlege spørsmål

Waterproof Mortar Additives

Q1

Which additive improves both waterproofing and flexibility?

Answer:

Use a combination of cURL Too many subrequests. and HPMC K200 for optimal bonding and flexible waterproof films.

Q2

How do I enhance waterproof performance in harsh environments?

Answer:

Add NOVASTAR™ SHP hydrophobic powder and PCE 570P for higher density and water repellency.

Q3

What is the ideal HPMC dosage for waterproof mortar?

Answer:

Typical usage is 0.2 – 0.5 % by cement weight depending on viscosity and workability.

Q4

Can LANDU provide formulation guidance?

Answer:

Yes. Our R&D team supports full formulation development and performance optimization.

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Answer:

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Har du framleis spørsmål?

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Contact Technical Team →

LANDU profesjonelt team

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