Blown density is used to develop loose-fill coverage charts. Data for blown density vs thickness is used in the development of a variable blown density presentation for loose-fill insulation.

Thermal resistance (and conductivity) of loose-fill mineral fiber insulation depends on density and thickness. The resulting blown density data is useful in developing an expression for apparent thermal conductivity as a function of density. This will in turn aid the manufacturer in developing coverage information for packages of loose-fill insulation.

The blown density obtained in this method is for the thickness of the test only. The relationship of blown density with thickness can be determined by repeating the procedures outlined here using different thicknesses.

These procedures are not the same as the test method described in Test Method C 1374. Depending on the test conditions utilized, the blown density may, or may not, represent the installed density values obtained by using Test Method C 1374.

This guide can be used to develop appropriate blowing machine settings to achieve a target blown density at a predetermined thickness.

1.1 This guide describes two alternate procedures for determining blown density at a predetermined thickness or a range of thicknesses expected in field applications of mineral fiber loose-fill insulation.

1.2 This guide involves blowing a sample of loose-fill insulation into a test frame of known volume, measuring the weight of the insulation captured and calculating the blown density.

1.3 This guide is intended for pneumatically-applied loose-fill mineral fiber insulation designed for use in horizontal open attic spaces.

1.4 This guide is intended for product design and product auditing by manufacturers of loose-fill insulation. This guide is adaptable as a plant quality control procedure.

1.5 This guide does not predict the aged density of the mineral fiber loose-fill insulation.

1.6 This standard does not purport to address all the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.

1.7 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.