Cellulose acetate is a plant-based plastic that is hypoallergenic. This material was first used in late 1940’s. Cellulose acetate also has the widest range for transparency, rich colors, and finishes. Cellulose acetate is a non-petroleum based plastic that is made from natural cotton and wood fibers. CA for eyewear is made by forming layers of plastic into large blocks then carefully slicing individual parts, hand polishing and finally assembling them into a frame.
Monoqool has made a series in the unique NXT@ material, which is extremely strong and lightweight. This has helped them to make eyeglasses with ‘volume’ without adding weight. So the frames weighs only 5 grams. The NXT material was first developed by the US military for the usage in windshields in helicopters.