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Our Bomar hatches are polycarbonate (Lexan). Most other hatches I've worked on were too.
Lexan is stronger but less UV resistant than acrylic. Acylic is often used for smaller portlights, whereas Lexan is preferred because of its strength for larger areas like hatches.
For a 20"x20" opening, I'd use Lexan/polycarbonate, not acrylic.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT