OK, I guess the Laser material is NOT cross linked.

It is Techrothene 109, from the Laser Pico brochure;

Techrothene 109 is a linear high density UV stabilised compound moulded into a stress free homogeneous sandwich with an inner closed cell structure.

Exceptionaly Strong
Incorporates built-in buoyancy
Superbly Stiff
Highly resistant to scratching and impact damage - easy to repair