Introduction
In modern architecture, especially in Pakistan\’s bustling cities like Karachi, Lahore, and Islamabad, glass facades and curtain walls are symbols of progress and aesthetics. However, their performance and longevity hinge on one critical component: the sealant. Silirub WS+ by Soudal is a high-performance, one-component neutral silicone sealant specifically engineered for weatherproof sealing in the facade and glazing industry. Designed to withstand Pakistan\’s harsh UV exposure, monsoon rains, and temperature extremes, this product ensures that your buildings remain not only beautiful but also airtight, waterproof, and durable. This guide explores why Silirub WS+ is the trusted choice for architects, glaziers, and contractors across Pakistan.
What is Silirub WS+?
Silirub WS+ is a low-odor, neutral-curing silicone (polysiloxane) sealant. It comes in a stable paste consistency and cures upon exposure to atmospheric moisture, forming a permanently elastic and durable seal. Its formulation is optimized for compatibility with modern facade materials, including double-glazing units, making it a specialist product for high-end construction projects.
Key Technical Specifications
- Basis:Neutral Silicone (Polysiloxane).
- Curing:Moisture-curing, skins in approx. 9 min (23°C/50% RH).
- Curing Speed: 2mm/24h at 23°C & 50% RH.
- Hardness:25 ± 5 Shore A (Very Flexible).
- Elongation at Break:> 800% (Exceptional Movement Capability).
- Temperature Resistance:-60°C to +180°C (Extreme Range).
- Elastic Recovery:> 80%.
- Colors: Black.
- Packaging: 600 ml Foil Bag.
- Shelf Life:18 months in unopened, cool, dry storage.
Top Benefits of Silirub WS+ for Pakistani Projects
- Exceptional Weather & UV Resistance:Formulated for facade exposure, it resists Pakistan\’s intense sun, rain, frost, wind, and ozone without degrading, cracking, or losing adhesion.
- Superior Elasticity & Movement Accommodation:With over 800% elongation and 80% elastic recovery, it can handle significant thermal expansion and contraction of glass and metal facades.
- Excellent Adhesion on Critical Substrates:Bonds superbly to glass (including laminated), coated aluminium, galvanized steel, concrete, and masonry—the core materials of modern facades.
- Compatibility with Double Glazing Systems:Specifically compatible with polysulphide and silicone edge seals of insulating glass units (IGUs), preventing system failure.
- Wide Service Temperature Range:Functions flawlessly from freezing winters to scorching summers, making it perfect for Pakistan\’s diverse climate.
- MEKO-Free & Low Odor:Ensures a better and safer working environment for applicators.
Primary Applications in Pakistan\’s Construction Industry
- Weatherproof Sealing of Glass Curtain Walls & Facades:The primary use, ensuring long-term water and air tightness.
- Sealing Expansion/Connection Joints in Buildings:Around windows, panels, and between different facade materials.
- Structural Glazing Perimeter Sealing:For structurally glazed window panels (non-adhesive function).
- Sealing in Double Glazing Unit Installation:Ideal for secondary sealing applications compatible with IGU edge seals.
- General High-Performance Weather Sealing:For any joint exposed to severe outdoor conditions.
Step-by-Step Application Guide
- Surface Preparation:Surfaces must be clean, dry, and free of dust, grease, and old sealant. Use Soudal Surface Cleaner.
- Priming/Activation:On porous surfaces (concrete, masonry), use Primer 150. On non-porous surfaces (coated aluminium, glass), use a Soudal Surface Activator for best adhesion.
- Joint Dimensions:For glazing: min. 4mm width, min. 6mm depth. For general weather seals: 5-30mm width. Follow the rule: depth = 1/2 x width (for joints 10-30mm wide).
- Application:Load cartridge into a manual, battery, or pneumatic caulking gun. Apply evenly into the joint without trapping air.
- Finishing:Immediately tool the bead smoothly with a spatula dipped in a soapy solution or Soudal Finishing Solution. Avoid getting solution on the joint edges.
- Curing:Allow to cure at recommended application temperatures (5°C to 35°C). Full cure develops over days depending on humidity and depth.
Frequently Asked Questions (FAQs)
Q1: Can it be used for structural glazing (bonding glass to the frame)?
No, Silirub WS+ is a weather sealant, not a structural adhesive. It is used for perimeter sealing around structurally glazed panels. For structural bonding, other specific Soudal products are required.
Q2: What is the key difference between Silirub WS+ and a general-purpose silicone?
Silirub WS+ is a facade-grade sealant with certified high movement capability (Class 50/LM), extreme temperature resistance, and guaranteed compatibility with double-glazing units. General-purpose silicones lack these specific certifications and compatibilities, risking facade failure.
Q3: Is it paintable?
No, like most high-performance silicones, Silirub WS+ is not paintable. It is available in standard black color, which is aesthetically discrete for most facade applications.
Q4: Can it be used on natural stone or marble?
No, it is not suitable for natural stone (like marble, granite) as it may cause staining.
Q5: What standards does it meet?
It meets stringent international standards: ISO 11600 G 25 LM and ASTM C920 Type S, Grade NS, Class 50. It is also LEED 2009 compliant (Credit 4.1) for low VOC emissions.
Why Choose PATSA for Silirub WS+
PATSA Pakistan is your trusted partner for authentic Soudal products in Pakistan. With Silirub WS+, PATSA ensures you get a globally tested sealant, backed by reliable local stock and hands-on technical support. Our team guides you through proper selection and application, so your facade projects are completed efficiently, professionally, and built to last.
Conclusion
For any project involving glass facades, curtain walls, or high-performance weather sealing in Pakistan, specifying the right sealant is non-negotiable. Silirub WS+ offers the perfect blend of extreme elasticity, proven durability, and material compatibility needed to protect your investment against the elements. Don\’t settle for less on your next iconic building.
Call to Action
Elevate your facade projects with the sealant professionals trust. Contact PATSA Pakistan today to get your Silirub WS+ 600ml bags and connect with technical experts for your specific project needs in Karachi or anywhere in Pakistan. Ensure lasting performance choose Silirub WS+.
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