Watertight and low wight material

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The project involves using B50 solar cells with 21% efficiency, requiring a cover material that is watertight, lightweight, and minimally affects performance. The preferred material should be thermoplastic for effective sealing and should absorb minimal photons of 1.1 eV and higher. Suggestions include acrylic or polycarbonate as potential options for the cover material. The discussion seeks a list of suitable materials with their specifications. The goal is to find an optimal solution that meets these specific requirements.
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In my project i have solar cells we use are called B50 cells with an efficiency of 21%.

Since the cells come in contact with water we are looking for a cover material that is first of all watertight and secondly it should influence the performance as less as possible. Last but not least the weight of the cover material should be very low.

Requirements:
• Watertight
• The material should be a thermoplastic in order to seal it
• Low mass
• Absorb minimal fotons of 1,1 eV and higher.

Expected results:

A list of materials with its specifications.

so can please anybody help
 
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I'm guessing you don't want glass. How about a plastic like acrylic or polycarbonates?
 
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