The surface delamination and deformation greatly added to the aircraft drag. Fracture toughness is a material property that describes resistance to fracture and delamination. These improve the paper's compression strength, bursting strength, tensile breaking strength, and delamination resistance. Negative buoyancy of the lower continental crust and mantle lithosphere drive delamination. This leads to two situation&colon; fiber-matrix delamination or matrix having plastic shear. Delamination often first appear around dents. The early plywood used was prone to damage from moisture and delamination. Analysis has shown that the 2009 delamination (cracking) could not have been predicted. When drilling in composite materials the problem with delamination is eliminated. The catastrophic failure mode is caused by delamination between the belt and its fabric reinforcement. The cause of fiber pull-out and delamination is weak bonding. All surfboards made of foam and resin can face the problem of delamination. Processing can create layers in materials which can fail by delamination. In July, several A-1s crashed with wing failure due to plywood delamination. Both temperature extremes ultimately results in delamination.