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Erie’s Float glass is a soda lime glass. Manufactured using a horizontal drawing process where the molten glass is drawn out on a layer of molten tin. Because of the tin manufacturing process, float glass is a high quality, defect free, flat, uniformly thick, economical product. The flatness characteristic makes it an especially popular choice. Erie carries float glass in several thickness from .5mm to 4.77mm. Custom thickness available.
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Chemical Analysis |
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Composition |
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Si02: 70.8%, Na2O: 13.9%, CaO:8.2%, MgO: 4.4%, Al2O3: 1.9%, K2O: 0.4%, SO3: 0.3%,
Fe2O3: 0.08%
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Hydrolytic class |
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Standard DIN 12111: class 3 Standard ISO 718: class 3
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| Mechanical Properties |
| Density |
2.5 g/cm3 |
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0 to 100°C: 8.0 10-6 per °C or °K
0 to 200°C: 8.1 10-6 per °C or °K
0 to 300°C: 8.4 10-6 per °C or °K
0 to 400°C: 8.7 10-6 per °C or °K
0 to 500°C: 9.0 10-6 per °C or °K
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| Coefficient of elasticity for tension or Young's Modulus |
E=70 109 Pa |
| Poisson's ratio |
0.24 |
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Hardness
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Vickers Scale: 6.35 109 Pa
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Mohs Scale: 6.5
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Electrical Characteristics |
| Electrical bulk resistance |
Dialectric constant |
5 107: ohms.m for 1000Hz and 25°C
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7.75 at 106 HZ and 25°C
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Optical and Photometric Characteristics |
| Refractive index |
Reflection |
1.52 in visible range
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=(n-1/n+1)2 with=0.04 for n=1.5 i.e.
about 8% for the two faces. |
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Thermal Characteristics |
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| Specific heat |
Transformation point |
1 103: J .kg-1
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Tg:555 °C for viscosity of 1013.4 poises |
| Thermal conductivity at 20° C |
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1 kcal. m/h m2 °C=1 W.m-1. °K
Normal emissivity factor 0.9
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