parahawk
Joined: 10 Jul 2006
Posts: 21
Location: Washington State
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 Posted: Wed Feb 28, 2007 8:55 am Post subject: Windshield crazing |
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When I purchased my aircraft, the dealer had another Allegro with 700 hours. The upper right and left corner of the windshield had a lot of crazing,( fine cracks) everywhere. I thought at first it might be due to permanent slight engine vibrations, but after reading this article I have my doubts and it might result from using the wrong cleaning products:
HERE IS AN EXERT OF THE ARTICLE:
First, most aircraft windows are acrylic plastic (as opposed to Lexan or Polycarbonate), and acrylic plastic is scratchable. Proper care involves preventing scratches that are preventable and properly taking care of those that are not.
When cleaning a window, always remove as much abrasive dirt as possible without touching the surface. Ideally, this would involve flushing the surface with water and allowing the accumulated bug residue to soak. After a final flushing with more water and carefully drying with a clean soft cloth, use a good cleaner/polish like Plexiclear for acrylic windows following the directions.
The good ones like Plexiclear or similar products, are those that are safe to use on acrylic plastics. The bad ones, including the very dangerous, tend to be materials never intended to be used as an aircraft window cleaner/polish, such as glass cleaners.
Glass cleaners invariably contain ammonia which will kill acrylic plastics. DO NOT use anything containing ammonia on acrylic plastics. It will cause crazing, thousands of microscopic cracks, in short order. ...............................
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