http://www.pilkington.com/europe/uk/...architects.htm is a link to some PILKINGTON RELATED FAQs
They are all worth a read in particular FAQ 4
What glass would you recommend for a domestic house or conservatory for South facing applications?
ANSWER The Pilkington Optifloat? Tinted (formerly known as Pilkington Antisun?) range has long been an industry standard for low-to-medium performance glass with the Pilkington Suncool? range suiting high performance needs. The Pilkington Eclipse? range fits between the two.
To maximise the reduction of solar gain, the ideal position for a solar control glass (e.g. Pilkington Optifloat? Tinted) in a double glazing unit is the outer pane. Pilkington K Glass? is not a solar control glass: however, its presence in a double glazing unit can considerably improve its thermal insulation (reduce the U-Value) over conventional units. The ideal position for the Pilkington K Glass? low emissivity coating is on the inner pane facing the cavity. Hence, if the requirements are for reduced solar gain and improved thermal insulation, both types of glass can be combined in one unit. Both Pilkington K Glass? and Pilkington Optifloat? Tinted are available in toughened and laminated form.
Better insulation and no cold spots near windows make Pilkington K Glass? an excellent choice for conservatories, because thanks to a special low emissivity coating on the surface of the glass, it let?s the sun?s rays through, but reflects heat from fires and radiators back into your home - heat which ordinary double gazing allows to escape.
In fact it will typically keep an unheated conservatory much more comfortable for a greater part of the year than ordinary double glazing, allowing the occupier to make the most of the conservatory all year round.
