How to Choose the Right Glazing Silicone Sealant for Structural Silicone Glazing Projects

When it comes to delivering clean, modern glass façades or structurally-sound curtain walling systems, sealant is a detail you can’t afford to overlook. Whether you’re working on large commercial projects or smaller bespoke builds, choosing the right glazing silicone sealant is essential to the success and longevity of structural silicone glazing.

In this article, we’ll take a closer look at what makes a good sealant for glazing applications, how to navigate the options available, and highlight a few trusted products that professionals across the UK rely on.

Why Silicone Matters in Structural Glazing

Structural silicone glazing is the process of bonding glass to a frame or substructure using silicone sealant, without the need for visible mechanical fasteners. This technique allows for uninterrupted glass surfaces, improving both the appearance and thermal performance of buildings.

But for the system to work as intended, the silicone used must be up to the task. These sealants need to provide strong adhesion, tolerate movement, and withstand weathering, UV exposure, and temperature extremes. In short, your sealant is doing a lot of heavy lifting behind that sleek exterior.

Key Qualities of a Glazing Silicone Sealant

If you’re specifying or sourcing sealants for a structural glazing system, here’s what to look out for:

• Neutral cure formulation – Prevents corrosion and is compatible with most building materials.
• High elasticity – Allows for movement in the structure without compromising the bond.
• UV and weather resistance – Ensures long-term durability, particularly in exposed façades.
• Strong adhesion – Maintains integrity between glass and metal or other substrates.

Recommended Products for Structural Glazing

At Sealant Supplies, we stock a wide variety of specialist products suitable for structural silicone glazing. Here are three options that consistently meet the demands of professionals:

DOWSIL 895 Structural Glazing Sealant

Engineered specifically for structural applications, DOWSIL 895 is one of the most trusted sealants in the industry. It offers excellent adhesion to glass and metal and has a proven track record in curtain walling systems.

Thanks to its high modulus and UV resistance, DOWSIL 895 remains durable over decades of exposure, making it ideal for projects where longevity and performance are non-negotiable.

Bond-It WP100 – Neutral Cure Oxime Silicone

For general glazing and weather-sealing tasks, Bond-It WP100 is a reliable choice. This neutral cure sealant is particularly useful in situations where compatibility with sensitive materials is a concern. It forms a permanently flexible seal and is suitable for both interior and exterior applications.

Whether you’re sealing around window frames or using it as part of a wider glazing installation, WP100 delivers clean results with minimal effort.

DOWSIL 995 Structural Glazing Sealant – Premium Performance for Structural Bonding

DOWSIL 995 is a high-performance sealant specifically designed for structural silicone glazing. It provides exceptional adhesion to glass and metal, making it ideal for curtain walling and other glazing applications. With strong durability, UV resistance, and flexibility, it ensures long-lasting bonds even under harsh conditions. Available in boxes of 12 cartridges, it’s the go-to choice for professional, large-scale projects.

Build Smart with the Right Sealant Partner

It’s easy to underestimate the importance of sealants until you’re facing a call-back or a failed bond. In structural glazing, the risks of using the wrong product are too high. That’s why it’s worth working with suppliers who understand the trade and can offer advice, competitive pricing, and access to trusted brands.

At Sealant Supplies, we’re committed to supporting tradespeople, contractors, and installers with high-quality products, fast delivery, and bulk order options that make sense for your business.

Making the Right Sealant Choice

Whether you’re sealing a high-rise glass façade or working on residential glazing, choosing the right glazing silicone sealant is a decision that affects safety, performance, and appearance. Explore our full range of structural and general-purpose sealants online. With brands like DOWSIL, Bond It, and more in stock, we’ll help you find the right product at the right price every time.