New SGG PLANITHERM TOTAL sets higher standard for Window Energy Ratings

SAINT-GOBAIN GLASS has greatly improved the Window Energy Rating performance of its flagship energy efficient glass

The solar factor (g-value) of SGG PLANITHERM TOTAL has been increased by 2% to 0.66 for standard windows (0.71 with SGG DIAMANT low-iron glass outer pane) whilst maintaining the same low U-value of 1.2 W/m2.K, further optimising the balance between heat loss and solar heat gain.  This development signifies a turning point for the market, making cost effective energy saving windows easier to achieve than ever.

A turning point for the market

"Insulating glass units comprising PLANITHERM TOTAL and ordinary float glass will now reach the same BFRC energy index as a hard coat combined with low-iron glass,” explains Susan Lambeth, Product Manager at SAINT-GOBAIN GLASS. “We already knew that by switching to PLANITHERM TOTAL from hard coat the WERs performance improved by more than 5kWh/m2/yr*. With this latest innovation that improvement is now around 8kWh/m2/yr*, which is typically the equivalent of adding significantly more expensive low-iron glass to the outer pane. This means that window companies can supply the excellent Window Energy Ratings as standard without the additional expense of low-iron glass”.

SGG PLANITHERM TOTAL energy efficient glass

SGG PLANITHERM TOTAL is manufactured 'offline' on a magnetron coater. This process is carried out after the glass has been made and involves the deposition of a series of metallic oxide layers onto the surface in a vacuum. Thanks to the flexibility of magnetron coating technology products can be modified and adapted to provide excellent thermal insulation and neutrality, whilst maximising solar gain and passive natural lighting.

A new standard for Window Energy Ratings

Lambeth continues, “We expect this breakthrough to set a new standard for WERs. The subsequent higher g-value with low-iron glass makes top of the range A-ratings easier to achieve whilst, at the same time, offering homeowners the target C-rating using the latest energy-saving technology, without the high price tag".


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