CAN/CGSB-4.2 No.70.1-94
1. PURPOSE AND SCOPe
1.1 This method determines the rate of heat flow (heat flux) from a warm,
dry, constant-temperature flat plate (denoted here as the hot plate)
through the dry specimens of textile fabrics, battings, and other
textile materials due to the combined action of heat conduction and
radiation. Two test procedures may be used to perform the measurement
of heat flux, either:
Procedure 1: through both the test specimen and the standard still-air
layer; the specimen is in contact with the hot plate and the air layer
which is situated between the specimen and the cold plate, see
Figure 1.
or
Procedure 2: through the test specimen alone, when it is placed in
contact with both metal plates, see Figure 2.
1.2 To test textile fabrics with thicknesses less than 3 mm, one must use
Procedure 1. Thicker fabrics, battings, quilts or layered fabric
assemblies may be tested either with Procedure 1 or with Procedure 2.
The main difference between these two procedures is the presence of the
air layer on the cold side of the fabric. This air layer, in addition
to providing a standard resistance needed to increase the precision of
a thin fabric test, permits the examination of the radiative heat
exchange across the air layer and the influence of the surface
emittance of the fabric.
1.3 This method is limited to determination of the heat flux through
specimens of fabrics, layered fabric assemblies, and battings having
thermal resistance and thicknesses as follows:
a. for Procedure 1: thermal resistance 0.05 to 1.5 m².K/W, thickness
not in excess of 50 mm; and
b. for Procedure 2: thermal resistance 0.10 to 1.5 m².K/W, thickness in
the range of 3 to 50 mm.
1.4 If the measured heat flux will be used for determination of the thermal
resistance (or its inverse: thermal conductance), the specimens must
meet the following conditions:
1.4.1 The specimen should be homogeneous and the portion of the specimen over
the test area should be typical of the whole specimen in every aspect.
1.4.2 Non-homogeneous samples such as quilted fabrics may be tested if
several tests are made with the quilt lines in different positions to
average out the effect of non-uniform insulation (Note 1).
1.5 The testing and evaluation of a product against this method may require
the use of materials and/or equipment that could be hazardous. This
document does not purport to address all the safety aspects associated
with its use. Anyone using this method has the responsibility to
consult the appropriate authorities and to establish appropriate health
and safety practices in conjunction with any existing applicable
regulatory requirements prior to its use.
SDO:
CGSB
Language:
English
ICS Codes:
91.120.10;
59.080.10
Status:
Withdrawn
Publish date:
1994-09-29
Standard Number:
CAN/CGSB-4.2 No.70.1-94