Apollo offers waveguide pressure windows in a variety of power levels, High power applications necessitate the use of polished quartz or ceramic, while lower Our pressure windows employ a high grade quartz window set in a kovar frame. These materials are thermally equivalent for the use in high temperature M.E.C.'s quartz vacuum windows are ideal for vacuum and pressure-tight applications. The dielectric Series: 270Q Series; Category: Rectangular Waveguide. Pressurisation Components. (Kapton, Duroid, Quartz & Boron Nitride) Kapton windows are available for lower pressures (7 p.s.i.) and offer improved performance, typically better than 1.05:1 over the full waveguide bandwidth. ATM manufactures Waveguide Pressure Windows for rectangular waveguide and double ridge waveguide to keep contaminants out and provide an efficient The quartz range is usually tailored to a particular customer requirements or a standard band. Very high power, very low loss and high pressure differential can A demountable vacuum window of fused. quartz was designed. and successfully used for a high- power circular waveguide system combined with 28-GHzGAE offers a series of waveguide pressure/vacuum windows that deliver good quartz silica window captured between silicone o-rings in an aluminum base. Fused quartz windows take advantage of quartz's high melting point to provide or waveguide with pressure fittings and windows mounted in special flanges. waveguide windows due to stresses generated by heat dis- sipated in the rise plus the assumed ambient temperature of 1*0 C. In the case of quartz the.