A method has been developed to produce seamless, freestanding plastic cylinders with dimensions up to 18 cm in diameter, 4 cm in height and with mass density from 15 μg/cm to 300 μg/cm (approximately 0.15 to 3 μ thick). The polyvinyl formal resin may be subsequently coated with a variety of material by vapor deposition. The method employs standard thin‐foil fabrication techniques modified for use in cylindrical geometry and results in uniform reproducible cylinders.
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