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1. Introduction
Polycarbonate sheet screw button is specially designed for polycarbonate hollow sheet, Improved performance can be obtained by replacing the washers with special plastic screw buttons​, fitted with a suitable foam gasket, with or without a closing cap. They fit the thickness of each type of sheet (6mm, 8mm and 10mm, 16 mm and 25 mm can be customized), differing by sleeve length. Suit for 1/4" diameter(or below 1/4" diameter) metal and wood self drilling screws.

2. Character:
1). Simple fixing for Polycarbonate to roof framework.
2). Button increases support to polycarbonate sheet.
3). Sleeve prevents excessive tightening and local squashing around the screw.
4). Wide plastic washer with shank to match sheet thickness,
5). Foam sealing washer to keep water out.
6). Plastic cap to cover the screw head for a smooth finish and prevent screw rust.
7). Spreads stress and allow necessary sheet movement
8). Prevents both lifting of sheets and overtightening of screws, reducing ris of tear or shear around the screw's stem.
9). Coloured button to match glazing accessories

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