rigig polyurethane by pouring

[pardal]

Hi all helpers.

I need to know te relation of rigid PU vs thermal coeficient.

I need to make a carrying case that must keep ambient temperature about 75°F +- 10° at external temp ranging from -40°F to 165°F.
The case is made from steel sheet #18 awg.
Best regards

 

[pardal]

errata to prior post

must be: rellation of density of rigid PU vs thermal coeficient