PHYSICAL PROPERTIES OF GLASS


Kind Thickness Visible Solar Energy     Relative Heat Gain  1) U - VALUE   Shading 
of (mm) Reflection Trans Reflection Trans Absorption UV Solar     Winter Night Time     2) Summer Day Time   3) Coefficient
Product     mission   mission   Transmission Factor Kcal/m2hr BTU/ft2hr Kcal/m2hroC BTU/ft2hroF W/m2 oK Kcal/m2hroC BTU/ft2hroF W/m2 oK 4)
                                   
Float 2 9 90 8 85 7 69 87 588 216 5.49 1.12 6.36 5.03 1.03 5.85 1.01
2.1 9 90 8 85 7 69 87 588 216 5.49 1.12 6.36 5.03 1.03 5.85 1.01
2.2 9 90 8 85 8 68 86 583 214 5.49 1.12 6.36 5.03 1.03 5.85 1.00
2.3 9 90 8 84 8 65 86 583 214 5.49 1.12 6.36 5.03 1.03 5.85 1.00
3 9 89 8 82 10 60 85 577 212 5.49 1.11 6.30 5.03 1.03 5.85 0.99
3.2 9 89 8 82 10 60 85 577 212 5.49 1.11 6.30 5.03 1.03 5.85 0.99
3.5 9 89 8 82 10 59 85 577 212 5.49 1.11 6.30 5.03 1.03 5.85 0.99
4 9 89 8 80 12 58 83 566 208 5.37 1.10 6.25 5.03 1.03 5.85 0.97
5 8 89 8 80 13 54 83 560 206 5.37 1.10 6.25 5.03 1.03 5.85 0.96
6 8 87 7 76 17 50 81 549 202 5.31 1.09 6.19 5.03 1.03 5.85 0.94
8 8 86 7 70 23 43 77 528 194 5.25 1.08 6.13 5.03 1.03 5.85 0.90
10 8 85 7 66 27 38 74 506 186 5.14 1.05 5.96 4.98 1.02 5.79 0.86
12 8 84 7 66 27 36 73 500 184 5.08 1.04 5.91 4.93 1.01 5.74 0.85
                                   
DarkGrey 3 6 39 7 55 38 58 68 471 173 5.43 1.11 6.30 5.31 1.09 6.19 0.79
3.2 6 39 7 55 38 58 68 471 173 5.43 1.11 6.30 5.31 1.09 6.19 0.79
3.5 6 39 7 55 38 58 68 471 173 5.43 1.11 6.30 5.31 1.09 6.19 0.79
4 5 31 6 50 44 51 63 438 161 5.37 1.10 6.25 5.36 1.10 6.25 0.73
5 5 22 6 42 52 41 57 403 148 5.37 1.10 6.25 5.43 1.11 6.30 0.66
6 5 15 5 34 61 38 52 370 136 5.31 1.09 6.19 5.43 1.11 6.30 0.60
                                   
Green 2.1 9 85 8 70 22 40 76 519 191 5.49 1.12 6.36 5.22 1.07 6.08 0.88
2.2 9 85 8 70 22 39 76 519 191 5.49 1.12 6.36 5.22 1.07 6.08 0.88
2.3 9 85 8 69 23 38 75 514 189 5.49 1.12 6.36 5.22 1.07 6.08 0.87
2.5 9 84 8 68 24 37 75 514 189 5.49 1.12 6.36 5.22 1.07 6.08 0.87
3 8 84 7 68 25 32 75 514 189 5.43 1.11 6.30 5.25 1.08 6.13 0.87
5 8 76 6 51 42 22 64 443 163 5.37 1.10 6.25 5.31 1.09 6.19 0.74
6 7 74 6 47 47 21 61 427 157 5.37 1.10 6.25 5.31 1.09 6.19 0.71
8 7 69 6 39 55 17 56 394 145 5.25 1.08 6.13 5.31 1.09 6.19 0.65
10 7 64 5 33 61 12 52 367 135 5.14 1.05 5.96 5.31 1.09 6.19 0.60
                                   
DarkBlue 3 7 70 7 63 30 37 72 498 183 5.43 1.11 6.30 5.31 1.09 6.19 0.84
5 7 61 6 50 44 26 63 438 161 5.37 1.10 6.25 5.31 1.09 6.19 0.73
6 6 56 6 45 50 22 60 422 155 5.31 1.09 6.19 5.36 1.10 6.25 0.70
8 6 48 6 35 59 18 52 368 135 5.22 1.07 6.08 5.32 1.09 6.19 0.60
10 6 42 5 29 66 14 49 351 129 5.14 1.05 5.96 5.31 1.09 6.19 0.57
                                   
EuroGrey 3 7 63 7 63 30 30 72 498 183 5.43 1.11 6.30 5.31 1.09 6.19 0.84
4 6 57 6 56 37 24 67 465 171 5.37 1.10 6.25 5.31 1.09 6.19 0.78
5 6 45 6 45 49 20 59 416 153 5.37 1.10 6.25 5.36 1.10 6.25 0.69
6 6 44 6 44 50 17 56 394 145 5.31 1.09 6.19 5.36 1.10 6.25 0.65
8 6 34 6 33 61 12 51 363 133 5.25 1.08 6.13 5.36 1.10 6.25 0.59
                                   
Bronze 4 7 58 6 56 38 23 67 465 171 5.37 1.10 6.25 5.31 1.09 6.19 0.78
5 6 52 6 50 44 18 63 438 161 5.36 1.10 6.25 5.36 1.10 6.25 0.73
6 5 43 5 40 54 15 57 400 147 5.25 1.08 6.13 5.36 1.10 6.25 0.66
8 5 38 5 35 60 10 53 379 139 5.22 1.07 6.08 5.36 1.10 6.25 0.62
12 5 23 5 21 74 5 44 318 117 5.09 1.04 5.91 5.31 1.09 6.19 0.51
                                   
Rev. : 02   Calculated by HK
Remarks :  
* The value and performance shown in the tables are test result and not performance quarantees of each product. 2) & 3) Conditions by ASHRAE
* Figures of Relative Heat Gain, U-value and Shading Coefficient are calculated base on  the condition given by      2) 3)
ASHRAE standard. Outdoor temperature - 17.8oC ( 0oF ) 31.7oC ( 89oF )
1) When the ASHRAE solar heat Gain Factor is 542.5 Kcal/m2hr (200 Btu/ft2hr) and the outdoor temperature is 7.8oC Room temperature 21.1oC ( 70oF ) 23.9oC ( 75oF )
(14oF) warmer than in the room temperature Outdoor wind velocity 6.7 m/sec ( 15 mph ) 3.3 m/sec ( 7.5 mph )
4) Shading coefficient is the ratio solar heat gain through a glass to the solar heat gain through 3mm (1/8 inch ) thick  Indoor wind velocity 0 m/sec ( 0 mph ) 0 m/sec ( 0 mph )
sheet glass under the same set of conditions Solar intensity 0 Kcal/m2hr (0 Btu/ft2hr ) 672.7 Kcal/m2hr ( 248 Btu/ft2hr )