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I have just seen Pilkington energiKare glass which looks ok but there info managed to not say what U value it actually achieved does anyone now how good it actually is?
A sealed unit with one leaf of 4mm clear float/16mm argon cavity/4mm k glass has a centre pane u value of 1.5. The equivalent using Saint gobain Planitherm total intead of Pilks K gives a value of 1.2.