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What is the emissivity of low emissivity glass?

Pilkington manufactures a range of low emissivity (low-e) glass. The declared values of normal emissivity are as follows:

Pilkington K Glass™ 0.14
Pilkington K Glass™ A
 0.11
Pilkington K Glass™ S
 0.05
Pilkington Optitherm™ S1 Plus
 0.01

Emissivity of coated glass is determined in accordance with BS EN 12898 and declared in accordance with BS EN 1096-4.

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