General Purpose vs. Structural Sealants: Understanding the Difference and Their Correct Applications

In the world of construction and architectural design, sealants may appear to be small finishing materials — but they perform a big job. Whether it’s preventing air and water infiltration, bonding structural elements, or ensuring flexibility between joints, choosing the right sealant type can make or break a project’s longevity and performance.

As one of the Best Building Materials Suppliers in UAE, Krafthaus provides a complete range of high-quality sealants designed for different needs — from simple interior applications to complex façade and glazing systems. Among these, General Purpose and Structural Sealants stand out as two of the most widely used and essential types.

Let’s explore the key differences, uses, and correct application techniques for each.

 1. General Purpose Sealants

Overview

General Purpose Sealants are silicone-based and designed for routine sealing applications. They offer good adhesion to common building materials like glass, ceramic, aluminum, and concrete. These sealants are flexible, easy to apply, and ideal for everyday maintenance or minor sealing tasks.

Common Uses

·        Sealing joints in bathrooms, kitchens, and sanitary areas

·        Filling gaps around windows and doors

·        Interior finishing in residential and commercial spaces

·        Sealing lightweight partitions and HVAC duct joints

Advantages

·        Easy to apply and clean

·        Quick curing time

·        Good flexibility and adhesion to smooth surfaces

·        Resistant to moisture and mildew

How to Apply Correctly

1.     Surface Preparation: Ensure all surfaces are dry, clean, and dust-free for proper adhesion.

2.     Cut the Nozzle: Trim the nozzle at a 45° angle to match the joint width.

3.     Apply the Sealant: Use a caulking gun and apply an even bead along the joint.

4.     Tooling: Smooth the surface immediately using a spatula or your finger dipped in soapy water.

5.     Curing: Allow the sealant to cure for at least 24 hours before exposing it to moisture or stress.

Pro Tip:
General Purpose Sealants are not suitable for high-movement or load-bearing joints. For structural or exterior façade works, always opt for a Structural Sealant.

2. Structural Sealants

Overview

Structural Sealants are high-performance silicone or hybrid adhesives used for bonding glass, metal, and other façade materials in structural glazing applications. Unlike general-purpose sealants, they not only seal but also carry load and provide structural strength.

These sealants form an elastic, durable bond capable of withstanding wind pressure, temperature changes, and vibrations — making them a critical part of modern façade engineering.

Common Uses

·        Structural glazing systems (glass-to-metal or glass-to-glass bonding)

·        Curtain wall facades

·        Skylights and canopies

·        High-rise buildings and commercial towers

Advantages

·        Excellent strength and flexibility

·        Long-term resistance to UV rays, temperature, and moisture

·        Suitable for both interior and exterior structural applications

·        Compliant with international standards like ASTM C1184 and EN ISO 11600

How to Apply Correctly

1.     Surface Cleaning: Remove oil, dirt, and any release agents from the bonding surfaces.

2.     Priming: Apply a compatible primer if recommended by the manufacturer to enhance adhesion.

3.     Sealant Application: Use a professional caulking gun and maintain uniform thickness.

4.     Curing: Allow the sealant to cure under the right temperature and humidity for 24–48 hours.

5.     Inspection: Check for voids or air pockets before final assembly or glass installation.

Pro Tip:
Always use certified structural sealants that comply with ASTM or EN standards, especially for load-bearing joints or façade work. Non-certified products can compromise safety and long-term durability.

Professional Application Tips

·        Avoid using acetoxy-based sealants (acidic) on metals or natural stone — they can cause corrosion or staining.

·        Always check the joint movement capability before choosing a sealant.

·        Store sealants in a cool, dry place, especially in UAE’s hot climate.

·        For large façade projects, always consult a technical specialist or supplier before selecting a structural-grade product.

Why Choose Krafthaus – The Best Building Materials Suppliers in UAE

At Krafthaus, we supply a premium range of General Purpose and Structural Sealants trusted by engineers, contractors, and developers across the UAE. Our products are:

·        Tested for ASTM/EN standards

·        Weather- and UV-resistant for UAE’s harsh climate

·        Available in various colors and packaging sizes for different project needs

·        Backed by expert guidance to help you choose and apply the right product

By sourcing from the Best Building Materials Suppliers in UAE, you ensure not just product quality — but also long-term performance, safety, and compliance.

Conclusion

While General Purpose Sealants are perfect for everyday sealing tasks, Structural Sealants deliver strength and reliability for large-scale glazing and façade applications. Each serves a unique purpose, and understanding when and how to use them can greatly enhance the quality and safety of your projects.

For premium-quality sealants, expert support, and on-time delivery, trust Krafthaus — one of the Best Building Materials Suppliers in UAE.