Abstract
Aircraft acrylic transparencies are structural components that must withstand flight and ground loads; like metal airframes, they are subject to aging with attendant reductions in structural capabilities, generating warnings about aircraft safety as well as operational readiness [1]. Nevertheless residual stresses have been avoid during manufacturing, and maintenance operators have been tasked to use only washing products which are not aggressive at all, one of the most common causes of substitution of aircraft transparencies is still crazing appearance. This form of aging, defined Environmental Stress Cracking (ESC) is a predominantly physical phenomenon where an active liquid can cause craze formation at a much lower stress that would be required in air [2]; crazing stress values are temperature dependant, correlated to both acrylics’ void and entanglement density [3].
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