* 
Table 1. Specified Properties of Acrylic Plastic 
For Man-Rated Structures. 
Physical Properties 
Hardness, Rockwell M 90 ASTM-D785-62 
90 ASTM-D2583 
Hardness, Barcol 
Specific gravity 1.19 + 0.01 ASTM—-D792-64T 
(2 tests within 0.005) 
Refractive index; 1/8 inch 1650 se OsOL ASTM-D542-50 
912% 
23} 
ASTM-D1003-61 
ASTM-D1003-61 
Luminous transmittance; 1/8 inch 
Haze, 1/8 inch 
Heat distortion temperature 
+3.6°F/min at 264 psi 
+3.6 F/min at 66 psi 
Fed. Stan. 406 
Method 2031 
ASTM-D5 70-6 3T 
Thermal expansion/°F at 20°F 
Water absorption; 1/8 inch 
(a) 25 hours at 73°F 
(b) to saturation 
Mechanical Properties 
Tensile strength, rupture 9,000 psi (min) ASTM-D638-64T 
(0.2 in. /min) 
2% (min) - 7Z (max) 
400,000 psi (min) 
15,000 psi 
ASTM-D638-64T 
ASTM—D638-64T 
ASTM-D695-63T 
Tensile elongation, rupture 
Modulus of elasticity, tension 
Compressive strength, (min) 
(0.2 in./min) 
ASTM-D695-63T 
ASTM-D79 0-63 
ASTM-D732-46 
ASTM-D256-56 
Modulus of elasticity, comp. 420,000 psi (min) 
14,000 psi (min) 
8,000 psi (min) 
0.4 ft-lb (min) 
Flexural strength, rupture 
Shear strength, rupture 
Impact strength, 1 zod 
(per inch of notch) 
Compressive deformation under load 2% (max) ASTM-D621-64 
(4,000 psi at 122°F for 24 hours) 
* 
Specification developed by NCEL for procurement of acrylic plastic 
plates to be utilized in the fabrication of man-rated pressure 
resistant windows and pressure hulls. 
