For applications in agressive environments (swimming pools, salt water areas)

LB3 Panel: is a high performance insulation board manufactured from CFC or HCFC free closed cell rigid polyisocynurate PIR foam.

It's covered on both sides with an 80 μm embossed aluminum foil treated with white corrosion proof lacquer. 

Density of the foam: 35 ± 3.0 kg/m3