U values

THERMAL VALUES

Thermal value double glazed unitsSlenderpane slim double glazed units can achieve a range of u values to suit the nature of the project. These range from 2.1 w/m2k using a hardcoat low e glass and krypton gas, where cost is more important than thermal value, down to 1.2 w/m2k where the reverse is the case, using softcoat low e glass and xenon gas.

Sightlines of our warm edge spacers do not affect the thermal value and these are 6mm (Heritage), 7mm (Standard) or 10mm if required.

N.B. We recommend that a minimum of 3mm o/a is deducted from the tight size of the opening to arrive at the unit size.

UNIT   MAKE-UP – Outside  to inside OVERALL UNIT THICKNESS CENTRE PANE       U VALUE W/m2k
3mm clear/4mm krypton gas fill/4mm   Pilkington K Low e 11mm 2.1
4mm clear/4mm krypton gas fill/4mm   Pilkington K Low e 12mm 2.1
3mm clear/4mm krypton gas fill/4mm   Planitherm Total Plus softcoat 11mm 1.9
4mm clear/4mm krypton gas fill/4mm   Planitherm Total Plus softcoat** 12mm 1.9
4mm clear/6mm krypton gas fill/4mm   Pilkington K Low e 14mm 1.9
4mm clear/4mm xenon gas fill/4mm   Planitherm Total Plus softcoat 12mm 1.5
3mm clear/6mm xenon gas fill/4mm   Planitherm Total Plus softcoat 13mm 1.5
4mm clear/6mm krypton gas fill/4mm   Planitherm total Plus softcoat** 14mm 1.5
4mm clear/8mm krypton gas fill/4mm   Planitherm Total Plus softcoat** 16mm 1.3
4mm clear/6mm xenon gas fill/4mm   Planitherm Total Plus softcoat 14mm 1.2

** These are the most cost effective units when taking account of both u value and cost.