Aluminium has a density of 2.70 g/cm³ and copper has a density of 8.96 g/cm³.

This means Hydro can offer tubes that save up to 50% weight compared to copper tubes.

Most absorber manufacturers have already switched from copper sheets to aluminium sheets and thereby benefitted from the price and weight advantages of aluminium. The table below, demonstrates how the weight advantages also apply to the aluminium tubing and the additional weight saving potential.

Absorber weight saving potential in %, with partial or total aluminium solution:

	Copper tubes + copper sheet	Copper tubes + aluminium sheet	Aluminium tubes + aluminium sheet
Weight of tubes	100%	100%	51%
Weight of sheet	100%	60%	60%
Combined  weight (tubes+sheet)	100%	78%	56%
Absorber images courtesy of Solar Technologie International GmbH. The above values are physical fact and do not vary.