QC111a - Optical Procurement Requirements:
Optics shall meet cleanliness requirements at delivery as specified. These requirements shall be defined by performance specification, quantitative criteria (molecular and particulate) and/or qualitative inspection.
Transportation and storage containers for optics shall:
- Be fabricated from materials that will not outgas under ambient conditions
- Have provisions for backfill and/or purge with nitrogen
- Be constructed of materials that do not generate particles
- Meet cleanliness requirements equal to that of the delivered optic (surface to surface exposure).
- Bear adequate warning labels in accordance with the Subcontractor’s practices. In addition, the following message shall be placed on the containers:
NOT TO BE OPENED BY SHIPPING/RECEIVING
TO BE OPENED IN CLEANROOM ENVIRONMENT ONLY
TO BE OPENED ONLY IN THE PRESENCE OF COGNIZANT ENGINEER OR DESIGNEE
Handling procedures shall be developed to avoid damage to the optics or contact that will expose or transfer contaminants to the optical surface. Exposure to ambient air conditions must be limited to specified controlled environments. Subcontractor shall provide any handling or cleaning procedures that are specific for this hardware.
Backfill and/or Purge
Backfill the container with GN2.
Marking on optics as required shall use approved marking inks or labels and application processes. Care shall be exercised to avoid marking materials migration or plume effects.
Optical Witness Samples (OWS)/Witness Plate or Sampling
Optical Witness Samples shall be included as specified by the Subcontract/Purchase Order. These samples will be as flight-like as possible and handled in the same manner. In the event OWS are not required, the Subcontractor shall provide a witness table to assist in verification of the estimated cleanliness of the delivered optics.