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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.
A rough estimate of the clothing insulation for an active person is: I cl, active = I cl ×(0.6+0.4/M) 1.2 met < M < 2.0 met where M is the metabolic rate in met units and I cl is the insulation without activity. For metabolic rates less than or equal to 1.2 met, no adjustment is recommended. [1]
The organic foam impregnating method is one of the more widely used in industry, creating the ceramic foam with a 3D mesh skeleton structure and coat a ceramic slurry on a polyurethane organic foam mesh body. The ceramic foam is obtained by allowing the body to dry at room temperature and burn the mesh body to retrieve the ceramic foam.
Thermal insulation is the reduction of heat transfer (i.e., the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in range of radiative influence. Thermal insulation can be achieved with specially engineered methods or processes, as well as with suitable object shapes and materials.
The air is held in the voids inside the material itself as well as in the gaps between the clothing layers. Of the natural clothing materials, fur and leather provide the best insulation. Wool, with its lanolin oil, is not very absorbent and keeps its insulation properties well when wet, unlike cotton. [6]
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The design goal of PrimaLoft was to create a fabric that would offer the same level of insulation effectiveness as down, even when wet. The original patent filed for PrimaLoft insulation, known as "Synthetic Down" and filed in May 1986, describes a particular mix of synthetic microfibers and macrofibers that compares favorably to down. [11]
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