Double Glazing

The Inside Guide To Superior Double Glazing

To create a better window, we looked inside...

Small things make a big difference.

So where other double glazing manufacturers use a rigid metal spacer to keep the glass panes apart, National Glass uses a unique Thermoset Spacer. It’s made of durable polymer that holds its shape and gives exceptional thermal performance, keeping you cool in summer and snugly warm in winter. You’ll notice the comfort – and appreciate the lower energy bills. Take a closer look at all the benefits you’ll enjoy with National Glass. We think you’ll agree that strength, beauty and durability come from within.

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It's What's Inside That Counts

Everyone wants a warm, comfortable home, with windows that last a long time and always look great. It sounds so simple – but achieving all these objectives is a very big ask.

Windows have to put up with a lot. They face wild swings in temperature from summer to winter, as well as harsh New Zealand UV rays, barometric pressure changes and blasting winds. To construct a double-glazing system that stands up to this treatment year in and year out, you need to incorporate some pretty clever technology. So that’s exactly what we did.

National Glass Double Glazing

Thermoset Fills The Gap

In a double-glazed unit (DGU), the spacer is what keeps the two panes apart. Our spacer is made from thermoset polymers – a special type of plastic foam that becomes permanently set during the curing process, which means it retains 100% bounce-back memory when bonded to the glass. The Thermoset Spacer will expand and contract, but will always return to its original shape so it cannot be distorted by temperature changes once the window is in place. It also has outstanding UV resistance.

National Glass Double Glazing

The No Metal advantage

“Thermal efficiency through NO presence of Conductive Metals” is Thermoset Spacer’s hallmark. The edge of the DGU is indeed the most vulnerable to heat and cooling loss, condensation and frosting. Thermoset Spacer’s No-Metal formula blocks the heat escape path and provides one of the best thermal performances in the industry. Some double glazed windows rely on rigid metal spacers which cannot compensate for the natural expansion and contraction that occurs daily in DGUs. Without all-foam spacers, windows can develop stress cracks that will eventually lead to seal failure.

Our Thermoset Spacer has no metal parts, so you avoid these problems. The result is an unbelievably durable double seal that keeps heat in and moisture out.

Contact National Glass to discuss your Double Glazing needs.