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  2. Vapor barrier - Wikipedia

    en.wikipedia.org/wiki/Vapor_barrier

    Materials have a moisture vapor transmission rate (MVTR) that is established by standard test methods. One common set of units is g/m 2 ·day or g/100in 2 ·day. Permeability can be reported in perms , a measure of the rate of transfer of water vapor through a material (1.0 US perm = 1.0 grain/square-foot·hour· inch of mercury ≈ 57 SI perm ...

  3. Thermal analysis - Wikipedia

    en.wikipedia.org/wiki/Thermal_analysis

    Polymers represent another large area in which thermal analysis finds strong applications. Thermoplastic polymers are commonly found in everyday packaging and household items, but for the analysis of the raw materials, effects of the many additive used (including stabilisers and colours) and fine-tuning of the moulding or extrusion processing used can be achieved by using differential scanning ...

  4. Perm (unit) - Wikipedia

    en.wikipedia.org/wiki/Perm_(unit)

    A variant of the metric perm is used in DIN Standard 53122, where permeance is also expressed in grams per square meter per day, but at a fixed, "standard" vapor-pressure difference of 17.918 mmHg. This unit is thus 17.918 times smaller than a metric perm, corresponding to about 0.084683 of a U.S. perm.

  5. Housewrap - Wikipedia

    en.wikipedia.org/wiki/Housewrap

    Housewrap (or house wrap), also known by the genericized trademark homewrap (or home wrap), generally denotes a modern synthetic material used to protect buildings. Housewrap functions as a weather-resistant barrier , preventing rain or other forms of moisture from getting into the wall assembly while allowing water vapor to pass to the exterior.

  6. Thermal conductivity measurement - Wikipedia

    en.wikipedia.org/wiki/Thermal_conductivity...

    Time-domain thermoreflectance is a method by which the thermal properties of a material can be measured, most importantly thermal conductivity. This method can be applied most notably to thin film materials, which have properties that vary greatly when compared to the same materials in bulk.

  7. Thermal insulation - Wikipedia

    en.wikipedia.org/wiki/Thermal_insulation

    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.

  8. Thermoforming - Wikipedia

    en.wikipedia.org/wiki/Thermoforming

    In its simplest form, a small tabletop or lab size machine can be used to heat small cut sections of plastic sheet and stretch it over a mold using vacuum. This method is often used for sample and prototype parts. In complex and high-volume applications, very large production machines are utilized to heat and form the plastic sheet and trim the ...

  9. Heat transfer vinyl - Wikipedia

    en.wikipedia.org/wiki/Heat_transfer_vinyl

    The design is cut into the material with a cutting plotter in reverse (adhesive/vinyl side up). The excess material is removed with tools such as hooks or tweezers - a manual and dextrous process referred to as "weeding". The tacky adhesive between the carrier and the vinyl holds together complex designs, although the labour naturally increases ...