I have a project to make a freezer for use in the tropicsI want to use Polyol and Iso to manufacture the rigid insulation foamPlease let me know the best mix ratio of the iso and polyol which would give me the best insulation valueThank youHarold
Bridges often have triangles on the side supporting themOver-passes sometime have a 'V' shape holding them above the ground.
The Louvre from memory has triangles.
Bridges More info in the link
