{HEAD ~ The cover assembly} includes an aluminosilicate glass substrate that is substantially free of retardance induced visual defects and has a thickness of less than 2 mm, a retardance of less than or equal to 5 nm over an area of at least 170 in2 , {TAIL ~ a 4 point bend strength} of greater than 150 MPa 
{ HEAD ~ The cover assembly } includes an aluminosilicate glass substrate that is substantially free of retardance induced visual defects and has a thickness of less than 2 mm , a retardance of less than or equal to 5 nm over an area of at least 170 in2 , { TAIL ~ a 4 point bend strength } of greater than 150 MPa
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