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Although single layer polycarbonate sheeting is more flexible than polycarbonate in twinwall configuration, it still retains significant advantages over alternative materials, including glass. A typical 6mm sheet has a density of 0.72 g/cm^2 [6] and a thermal insulation R value of 0.3 m^2°C/W, while allowing 80% of visible light pass through ...
Thermally processed material is usually totally amorphous, [7] and as a result is highly transparent to visible light, with better light transmission than many kinds of glass. Polycarbonate has a glass transition temperature of about 147 °C (297 °F), [8] so it softens gradually above this point and flows above about 155 °C (311 °F). [9]
The insulation effectiveness can be expressed as an R-value or RSI value. The higher the value, the greater is its resistance to heat transfer. A standard IGU consisting of clear uncoated panes of glass (or lights) with air in the cavity between the lights typically has an RSI-value of 0.35 K·m 2 /W.
An index level of 110, for example, means there has been a 10% increase in prices since the base period; similarly, an index level of 90 indicates a 10% decrease in prices. To calculate the percent change in prices between some previous period and a more current period using a PPI, the BLS uses the following formula:
This is a list of insulation materials used around the world. Typical R-values are given for various materials and structures as approximations based on the average of available figures and are sorted by lowest value. R-value at 1 m gives R-values normalised to a 1 metre (3 ft 3 in) thickness and sorts by median value of the range.
The Comparative Tracking Index (CTI) is used to measure the electrical breakdown (tracking) properties of an insulating material. Tracking is an electrical breakdown on the surface of an insulating material wherein an initial exposure to electrical arcing heat carbonizes the material. The carbonized areas are more conductive than the pristine ...