# Proof Test Levels for Advanced LIGO Viewports

Document #:
LIGO-E1101226-v3
Document type:
E - Engineering documents
Other Versions:
 LIGO-E1101226-v2 06 Mar 2015, 16:06
Abstract:
Inert environment, proof testing is required for all brittle, non-metallic materials on the vacuum envelope. This document defines the proof test levels for all of the Advanced LIGO viewports.
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