Thermal conductivity common use in the construction and textile industries. The construction industry makes use of units such as the R-value (resistance) and the U-value (transmittance). Although related to the thermal conductivity of a material used in an insulation product, R- and U-values are dependent on the thickness of the product. Likewise the textile industry has several units including the tog and the clo which express thermal resistance of a material in a way analogous to the R-values used in the construction industry. There are a number of ways to measure thermal conductivity. Each of these is suitable for a limited range
Mineral industry of Seychelles Mineral industry of Seychelles The mineral industry of Seychelles consists mostly of production of such materials as clay, coral, sand, and stone. Seychelles is not a globally significant mineral producer or consumer. In 2006, imports of mineral fuels accounted for about 27% of the value of total imports. That same year, Seychelles was estimated to produce about 210,000 metric tons per year (t/yr) of gravel and crushed stone, 93,000 t/yr of granite, and 8,100 t/yr of sand. The main commercial producers of these construction materials are Civil Construction Company Ltd., Gondwana Granite, and United Concrete Products (Seychelles) Ltd.; which are