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Housewrap<br />
A layer of material used on new building construction to prevent air leakage, thereby<br />
reducing heating and air conditioning costs and increasing comfort. It is installed in the<br />
exterior walls of a new building construction prior to adding the building’s final exterior.<br />
Housewrap is designed to be semi-permeable and allows water vapour to migrate through it<br />
thereby reducing the possibility of interior wall damage due to moisture build-up.<br />
HVAC<br />
The acronym applies to Heating, Ventilating and Air Conditioning systems that service air in<br />
an enclosed space, i.e., buildings, airplanes, cars, etc.<br />
Hybrid<br />
A nonwoven produced by incorporating the advantages of two or more nonwoven<br />
manufacturing systems to produce specialized nonwoven structures with properties<br />
unattainable by any single nonwoven process.<br />
Hydroentangling, Hydroentangled<br />
See Spunlace bonding.<br />
Hydrophilic<br />
Having an affinity for being wetted by water or for absorbing water.<br />
Hydrophobic<br />
Lacking the affinity for being wetted by water or for absorbing water.<br />
Hydroscopic, hygroscopic<br />
The ability to absorb moisture from the atmosphere, a property that fibers have in varying<br />
degrees.<br />
<strong>Nonwovens</strong> <strong>Glossary</strong><br />
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