NW16 Series Viewports 
• Optical discs are Kodial Glass (alkali borosilicate 7056) 
• 304 Stainless 
 Bakeout to 200°C 
• due to elastomeric fluorocarbon o-ring seal 
• heating rate should not exceed 2-3° per minute 
 BEFORE You Begin, INSPECT THE VIEWPORT 
 Caution Required When Using Viewports 
• Viewports are rated for Vacuum NOT Pressure 
• All viewports are fragile and must be handled and mounted with extreme caution 
• NEVER use a viewport that appears to be, or is known to be damaged 
• Never scratch the viewing area; a weakened viewport may implode (or explode) under wrong conditions.
• Make sure the glass chosen has a reasonable transmission at the wavelengths of interest.
• Remember, what is not transmitted may be reflected or absorbed.