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U-value
The U-value describes the heat loss per sq. metre in relation to the temperature difference between the interior and exterior.
Uniform corrosion
Metallic corrosion involves the loss of metal at a spot on an exposed surface – ranging from uniform attacks over the entire surface to severe local attacks.
UV water treatment
UV treatment of water is a common method of combating microorganisms. This procedure treats only bacteria that passes the UV bulb and should be regarded as a gatekeeper. This procedure gives no long term protection.