Glass Performance Specs

Glass Weight Per Square Foot
Glass ThicknessLBS
3/32 Single Strength (2.2 mm)1.21
1/8 Double Strength (3.0 mm)1.69
5/32 (3.9 mm)2.43
3/16 (4.7 mm)2.51
1/4 (5.7 mm)3.23
3/8 (10.0 mm)4.78
1/2 (12.0 mm)6.36
3/4 (19.0 mm)9.1
Approximate Load Limits on Glass Shelved LBS/Square Feet
Distance in Feet Between Supports
Glass Thickness1′2′3′4′5′
1/4731652N/A
3/8196451783
1/23458133157
3/4817197824223
Insulating Glass Wind Load Restrictions
Annealed Glass Maximum Area in Square Feet: 40 LBS Per Square Foot
Glass ThicknessAspect Ratio less than or equal to 2Aspect Ratio greater than 2Maximum Length (inches)
3/32 Single Strength (2mm)10872
1/8 Single Strength (3mm)151384
5/32 Single Strength (4mm)242096
3/16 Single Strength (5mm)3327140
1/4 Single Strength (6mm)4537142
Insulating Glass Wind Load Restrictions
Heat Treated Glass Maximum Area in Square Feet: 40 LBS Per Square Foot
Glass ThicknessAspect Ratio less than or equal to 2Aspect Ratio greater than 2Maximum Length (inches)
1/8 Single Strength (3.1mm)222084
5/32 Single Strength (3.9mm)303096
3/16 Single Strength (4.7mm)5050140
1/4 Single Strength (5.7mm)6060142
Cardinal Low-E Performance Data
3/4″ Double PaneVisible Light TransmittanceSolar Heat Gain CoefficientU Factor (Air)U Factor (Argon)
Clear / Clear81%0.760.48N/A
LoĒ²-240 (#2) / Clear40%0.250.30.26
LoĒ²-270 (#2) / Clear70%0.370.300.25
LoĒ²-272 (#2) / Clear72%0.410.300.25
Clear / Pyrolitic LOW E #375%0.720.330.29
1″ Triple PaneVisible Light TransmittanceSolar Heat Gain CoefficientU Factor (Air)U Factor (Argon)
Clear / Clear76%0.700.35N/A
LoĒ²-270 (#2) / Clear / LoĒ²-270 (#5)55%0.350.190.15
LoĒ²-272 (#2) / Clear / LoĒ²-272 (#5)57%0.310.190.15
LoĒ²-366 (#2) / Clear / LoĒ²-366 (#5)47%0.240.190.14