MIL-PRF-5425E
3.2 Materials. The plastic sheet shall be an acrylic plastic that is transparent and meets all
the requirements of this specification.
3.2.1 Color. Unless otherwise specified (see 6.2), the plastic sheet shall be colorless.
3.2.2 Dimensions. Dimensions of the plastic sheet shall be as specified by applicable
drawings. Unless otherwise specified (see 6.2), the tolerance on length and width dimensions
shall be ±0.063 inch (1.6 mm).
3.2.3 Thickness. The actual thickness of the plastic sheet at any point shall be within the
tolerances specified in table I. Thickness variations of sheets not included in table I shall be not
greater than the tolerance for the next larger thickness.
3.3 Performance characteristics. The plastic sheet shall meet the requirements of table II
when tested in accordance with table IV.
3.4 Formability. Formability shall be determined as specified in 4.5.3.
3.4.1 Sheets 0.500 inch (12.7 mm) and less in thickness. After the heating procedure in
4.5.3.1, the plastic sheet shall be formed into a hemispheric shape with an outside diameter of
10 ±0.1 inches (25 ±0.2 cm) and a draw of not less than 4.5 inches (11.5 cm).
3.4.2 Sheets over 0.500 inch (12.7 mm) in thickness. After the heating procedure in 4.5.3.2,
the plastic sheet shall be formed into a cylindrical shape with an outside radius equal to the
formability radius specified in table I. There shall be no surface irregularities or crazing after a
specimen cut from the formed sheet is exposed to accelerated weathering as specified in 4.5.10.1.
3.5 Resistance to weathering. After exposure to accelerated or natural weathering as
specified in 4.5.10, the plastic sheet shall show no evidence of cracking, crazing, or other surface
irregularities that affect visibility.
3
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business