One question we often receive from professional builders and homeowners alike is:

“Have you had any issues with window seals and gas leaks with any manufacturer?”

It’s a great and very reasonable question—because the long-term performance of insulated glass units (IGUs) is directly tied to how well the glass is sealed and insulated. In this article, we’d like to share some technical insights and how DRUET WINDOW ensures lasting quality.

Why Do Some IGUs Fail Over Time?

IGUs are made by sealing two or more glass panes around a spacer and filling the space with insulating gas, typically argon. Over time, seal failure can happen due to:

1 Substandard materials (e.g. poor sealants or spacers)

2 Inaccurate or low gas fill rates

3 Thermal cycling in extreme climates

4 Weak quality control or improper storage/handling

When the seal fails, the insulating gas leaks out and moisture may enter, causing fogging, reduced thermal performance, and increased energy costs.

Who Is Responsible for the Glass Sealing?

This is a crucial question. Some window brands outsource their glass production, which may lead to inconsistencies in quality. At DRUET WINDOW, we do things differently:

✅ In-House Glass Processing – Total Control from Start to Finish

We operate our own glass factory, which means:

We cut, seal, and gas-fill IGUs ourselves

We maintain strict quality control across every step

We ensure each unit meets rigorous durability standards

This vertical integration allows us to directly oversee sealant application, gas fill rates, and thermal performance.

Certified for Peace of Mind

At DRUET, we understand that certifications matter. That’s why:

Our insulated glass units (IGUs) are SGCC and IGCC certified

Our window systems are NFRC certified for energy performance

We use advanced sealants and warm-edge spacers to enhance longevity

Every batch of IGUs undergoes testing to ensure gas retention and moisture resistance

What Should You Ask Your Window Supplier?

Here are a few questions to ensure you’re choosing reliable IGUs:

Is your glass SGCC/IGCC certified?

Are your windows NFRC rated for thermal performance?

Do you fabricate your own IGUs or rely on third parties?

What’s your failure rate or warranty period for seal integrity?

At DRUET WINDOW, Reliability Comes Standard

With full control over IGU fabrication and industry-leading certifications, we confidently deliver durable, high-performance window systems tailored to North American climates and building codes.

If you’d like to learn more about our IGU specs, testing processes, or explore project partnerships, feel free to reach out to us at: info@yanyiwindows.com

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