Stucco-finished uncoated aluminium sheets must not come into contact with the unsafe materials listed below. Where problems of incompatibility are likely to occur, barriers (e.g. paints, bimetallic separation tapes or pads, appropriate to the materials and environment) should be incorporated.

Aluminium compatibility with dissimilar material
Material	Environment
	Rural	Industrial	Marine
Zinc	safe	safe	safe
Stainless steel	safe	safe	safe*
Lead	safe	safe	unsafe
Uncoated steel	unsafe	unsafe	unsafe
Copper	unsafe	unsafe	unsafe
Timber treated with fire retardant or preserved with unsafe copper or fluoride compounds	unsafe	unsafe	unsafe
Concrete, mortar and alkali-bearing materials	unsafe	unsafe	unsafe

*This applies only for fixing screws and rivets made from stainless steel, other stainless steel elements must be protected.

For further information please contact the Kalzip Technical Department