1.1 This specification covers the requirements for circular, fully tempered, high clarity, flat glasses used for portlight applications.

1.2 The dimensional values stated in English units are to be regarded as standard. The values given in parentheses are for information only.

1.3 The following safety hazard caveat pertains only to the test method portion, Section 11, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.