Durolite Heatguard 4 and Heatguard 8

Natural Lighting Innovation
Introducing the latest in natural lighting from Dimond called Durolite® Heatguard 4 and Durolite Heatguard 8. The technologically advanced Durolite HeatGuard™ range is specifically designed to reduce transmitted heat inside a building while increasing visible light.

HeatGuard 4 and HeatGuard 8 are two new natural lighting products which reduce the amount of heat transmitted into a building while still providing the highest level of visible light transmission. An easy way to remember which product to select is the larger the number, the less heat transmitted.

Durolite HG 4 and Durolite HG 8 have infra-red ray reflecting additives in the gel coat which reduce heat without losing light transmission and both also block 99% of the harmful ultraviolet UVa and UVb rays for extra protection. When this energy efficient product is used as roofing or cladding, costs for cooling and lighting in commercial and residential buildings are reduced.

How does it Work?

We see visible light as the colours of the rainbow with each colour having a different wavelength. The infra-red rays are within another wavelength called the thermal wavelength and we experience this every day as heat. The heat we feel from sunlight is actually the solar energy from the sun being transmitted by infra-red rays. Durolite HeatGuard reflects most of the infra-red rays so they do not pass through the Durolite sheet, thereby reducing the amount of heat entering the building, without sacrificing the amount of visible light.

The ability of sheeting to differentiate between light and heat can be measured by dividing the total visible light transmission by the total solar transmission. This is called the Selectivity Index. The chart below shows the difference in the Selectivity Index for the two grades of Durolite HeatGuard when compared to standard clear and opal sheet.

As seen in the chart, the Selectivity Index of Durolite HeatGuard is comparatively high. Durolite HG 4 selects and distinguishes infra-red rays and is 28% more efficient in reducing heat while letting natural light in like a clear sheet, whereas Durolite HG 8 is 36% more efficient than any opal sheet.

Durolite HG 4 and Durolite HG 8 are part of the Durolite natural lighting range of roofing and cladding applications that can be used with Dimond’s metal roofing and cladding products. Both come in a wide range of profiles, sheet lengths and are also available in foot trafficable sheets.

Note: Maximum Ultimate Wind Load is 1.5 kPa. Not intended to support point loads.