Sika WT 220 PMY (Waterproofing Concrete Admixture)

💧 Sika WT 220 PMY

Water Resisting & Crystalline Waterproofing Concrete Admixture for Watertight Concrete Structures

Water seepage is one of the most common problems in concrete construction, especially for underground and water-retaining structures. Over time, water penetration can lead to concrete deterioration, reinforcement corrosion, leakage issues, and expensive repair costs. Contact Buildmate Home Living Sdn Bhd

To solve this problem, many engineers and contractors today prefer using integral waterproofing systems instead of depending only on traditional surface waterproofing membranes.

Sika WT 220 PMY is a professional water resisting and crystalline waterproofing concrete admixture specially designed to reduce concrete permeability and improve long-term waterproofing performance from inside the concrete itself.

Manufactured by Sika Malaysia, this advanced waterproofing admixture is widely used in:
✔ Tunnels
✔ Basements
✔ Culverts
✔ Canals
✔ Water tanks
✔ Swimming pools
✔ Inspection chambers
✔ Manholes
✔ Underground concrete structures

Unlike conventional waterproof coatings that only protect the surface, Sika® WT-220 PMY works internally by forming crystalline structures inside concrete pores and capillaries. This helps permanently reduce water penetration and improve concrete durability.

🧱 What is Sika® WT-220 PMY? (Simple Explanation)

Sika® WT-220 PMY is a special waterproofing powder added directly into concrete during the mixing process.

👉 Simple understanding:

Concrete naturally contains tiny pores and capillaries that allow water to slowly pass through over time. Sika® WT-220 PMY helps block these water pathways from inside the concrete itself.

When mixed into concrete, the active ingredients react with cement and moisture to form tiny crystalline structures inside the concrete. These crystals help seal pores and reduce water penetration.

Unlike normal waterproof coatings that only protect the surface, Sika® WT-220 PMY becomes part of the concrete structure itself.

This helps create:
✔ More watertight concrete
✔ Better underground waterproofing performance
✔ Reduced water seepage
✔ Improved concrete durability
✔ Better protection for reinforced concrete

👉 In simple words:
Sika® WT-220 PMY helps concrete become more waterproof from the inside, not just on the outside.

📦 Product Specifications

🔹 Product Type

Water resisting & crystalline waterproofing concrete admixture

🔹 Appearance

Grey powder

🔹 Packaging

• 1.75 kg bag (15bags/box) **MOQ per box**
• 700 kg jumbo bag

🔹 Shelf Life

6 months from production date

🔹 Storage Condition

Store unopened product in dry and covered conditions. Protect from direct sunlight, rain, and moisture.

🔹 Density

~750 kg/m³

⭐ Key Advantages

💧 Reduced Water Penetration Under Pressure

Helps concrete resist water ingress even under hydrostatic pressure conditions.

🧱 Reduced Water Absorption

Minimises water movement inside concrete structures.

🔄 Enhancement of Self-Healing Properties

One of the biggest advantages of Sika WT 220 PMY is its ability to improve the self-healing capability of concrete.

Small micro cracks can self-seal better over time when exposed to moisture.

This feature is especially useful for:
✔ Basements
✔ Water tanks
✔ Tunnels
✔ Underground structures

🛡️ Improved Resistance Against Chemical Attack

Helps improve durability in aggressive underground and industrial environments.

🌫️ Reduced Vapour Transmission

Helps minimise moisture vapour movement through concrete systems.

🏗️ Common Applications in Malaysia

Sika® WT-220 PMY is widely used in projects requiring durable watertight concrete systems.

🚇 Tunnel Construction

Used in underground tunnel systems exposed to groundwater pressure.

🏢 Basement Waterproofing

Suitable for basement slabs, retaining walls, and underground car parks.

💧 Water Tanks & Reservoirs

Ideal for water-retaining concrete structures.

🌧️ Culverts & Canals

Improves long-term durability for drainage and infrastructure systems.

⚡ Inspection Chambers & Manholes

Helps protect underground concrete structures against water seepage.

🏊 Swimming Pools

Improves waterproofing performance in pool concrete systems.

🧪 How Crystalline Waterproofing Technology Works

When moisture enters concrete containing Sika® WT-220 PMY, the active chemicals react with cement hydration products.

This reaction forms crystalline structures throughout:

• Concrete pores
• Capillaries
• Micro voids

These crystals help permanently block water pathways within the concrete.

👉 This is why crystalline waterproofing technology is widely used for underground and infrastructure waterproof concrete projects.

📊 Recommended Concrete Mix Design

For best waterproofing performance:

✔ Minimum Cement Content

350 kg/m³

✔ Maximum Water-Cement Ratio

0.45

✔ Recommended Consistency

S3 / F4 consistency class (EN206-1)

✔ Recommended Dosage

Minimum:
1 × 1.75 kg bag per m³ concrete

Proper mix design and batching control are important for waterproof concrete quality.

🔧 Important Concreting & Curing Guidance

Concrete containing Sika® WT-220 PMY still requires:
✔ Proper vibration and compaction
✔ Good placing practice
✔ Correct finishing methods
✔ Proper curing process

Recommended curing compounds:

• Sika® Antisol® E
• Sika® Antisol®-90

Traditional curing methods such as:

• Ponding
• Wet hessian
• Water spray
• Polythene sheet curing

may also be used.

🔗 Recommended Waterproof Joint Systems

For complete waterproof concrete systems, Sika recommends combining Sika® WT-220 PMY with:
✔ Sika® Waterbars
✔ SikaSwell®
✔ Sikadur® Combiflex®
✔ Sika® Fuko systems

especially for:

• Construction joints
• Expansion joints
• Pipe penetrations
• Difficult waterproofing areas

❓ People Also Ask (Q&A)

💬 What is Sika WT 220 PMY used for?

Sika® WT 220 PMY is used as a crystalline waterproofing admixture to reduce concrete permeability and improve watertightness.

💬 How does crystalline waterproofing work?

It forms non-soluble crystalline materials inside concrete pores and capillaries to block water penetration.

💬 What is self-healing concrete?

Self-healing concrete refers to concrete’s improved ability to naturally seal small micro cracks when exposed to moisture.

💬 Is Sika® WT 220 PMY suitable for basements?

Yes. It is widely used for basements, tunnels, lift pits, water tanks, and underground structures.

💬 Can Sika® WT 220 PMY stop water leakage?

It helps significantly reduce water penetration and seepage when used with proper mix design and construction practices.

💬 Why use waterproofing admixture in concrete?

Waterproofing admixtures improve durability, reduce permeability, and help protect reinforced concrete structures from long-term moisture damage.

💬 Is crystalline waterproofing better than surface waterproofing?

Both systems serve different purposes. Crystalline waterproofing protects internally within concrete, while membranes protect externally.

🔥 Pro Tip from Construction Industry

Many waterproofing failures are not caused by the product itself, but by:
❌ Poor compaction
❌ Weak curing practice
❌ Incorrect mix design
❌ Improper joint treatment

Even high-performance waterproof concrete systems still require proper workmanship and quality control on site.

🏁 Final Summary

Sika WT-220 PMY is a professional water resisting and crystalline waterproofing admixture designed for durable watertight concrete structures.

Contact Buildmate Home Living Sdn Bhd

It helps:
✔ Reduce water penetration
✔ Improve concrete durability
✔ Enhance self-healing properties
✔ Reduce water absorption
✔ Improve underground waterproofing performance

Suitable for:
✔ Basements
✔ Tunnels
✔ Water tanks
✔ Swimming pools
✔ Culverts
✔ Manholes
✔ Infrastructure projects

For contractors, engineers, developers, and infrastructure construction projects in Malaysia, Sika® WT 220 PMY is a reliable solution for producing high-quality watertight concrete systems.