ASTM C421-95
(Test Method)Standard Test Method for Tumbling Friability of Preformed Block-Type Thermal Insulation
Standard Test Method for Tumbling Friability of Preformed Block-Type Thermal Insulation
SCOPE
1.1 This test method covers determination of the mass loss of preformed block-type thermal insulation as a result of a combination of abrasion and impact produced by a laboratory tumbling mechanism.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are provided for information only.
1.3 This standard does not purport to address all of 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 determine the applicability of regulatory limitations prior to use.
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Designation: C 421 – 95
Standard Test Method for
Tumbling Friability of Preformed Block-Type Thermal
Insulation
This standard is issued under the fixed designation C 421; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus
1.1 This test method covers determination of the mass loss 5.1 Box—A cubical box of oak wood, having inside dimen-
1 3 3
of preformed block-type thermal insulation as a result of a sions of 7 ⁄2 by 7 ⁄4 by 7 ⁄4 in. (190 by 197 by 197 mm),
3 3
combination of abrasion and impact produced by a laboratory mounted rigidly at the center of one 7 ⁄4 by 7 ⁄4 in. (197 by 197
tumbling mechanism. mm) end, so that the axis normal to a face of the box is that of
1.2 The values stated in inch-pound units are to be regarded a rotatable horizontal shaft. One side of the box shall be hinged
as the standard. The values in parentheses are provided for as a door and shall be gasketed to be dust-tight. The box shaft
information only. shall be motor driven at a constant speed of 60 6 2 r/min.
3 1
1.3 This standard does not purport to address all of the 5.2 Cubes—Twenty-four room-dry, solid oak, ⁄4 6 ⁄32-in.
safety concerns, if any, associated with its use. It is the (19 6 0.8-mm) cubes shall be placed in the box with the test
responsibility of the user of this standard to establish appro- specimens. The specific gravity of the oak cubes shall be
priate safety and health practices and determine the applica- approximately 0.65; white oak meets this requirement.
bility of regulatory limitations prior to use.
NOTE 1—Number each group of wood cubes 1 through 24. At the end
of every 600-revolution test, remove one “used” cube (follow the number
2. Referenced Documents
sequence and remove the oldest cube) and replace with a correspondingly
2.1 ASTM Standards:
numbered “new” cube. In this manner, cube wear is eliminated as an
C 167 Test Methods for Thickness and Density of Blanket uncontrolled variable in the test method. When the corners of the wood
cubes have been worn so that the radius of curvature is greater than ⁄16 in.
or Batt Thermal Insulations
(1.6 mm) or the cubes have become altered so as not to be comparable
C 168 Terminology Relating to Thermal Insulating Materi-
with new cubes, they shall be discarded and new ones used. A conven-
als
tional machinist’s radius gage may be used for checking the edge wear.
C 303 Test Method for Density of Preformed Block-Type
Thermal Insulation
6. Test Specimens
6.1 Cut the insulation with a fine-tooth saw (similar to a
3. Terminology
16-tooth band saw) into 1 6 ⁄16-in. (25.4 6 1.6-mm) cubes.
3.1 Definitions—Definitions pertaining to thermal insulat-
6.2 Test twelve cubes at a time cut from one piece of
ing materials are defined in Terminology C 168.
insulation. When flat insulation has special surfaces due to
treatment or molding, cut each cube to include such special
4. Significance and Use
surfaces as one face, except that the edges and corners of the
4.1 Several test methods for measuring mass loss by abra-
insulation shall not be used.
sion and impact of preformed block-type thermal insulation
6.3 Dry and condition specimens prior to test, following
have been used to some extent in the past. It is felt that no
applicable specifications for the material. If the material is
single test method completely covers all factors involving such
adversely affected by oven temperatures, then condition speci-
forces for different kinds of materials, but this test method is
mens for not less than 40 h at 73.46 1.8°F (23 6 1°C), and 50
intended to provide a procedure that will give reproducible
6 5 % relative humidity before testing. In the absence of
results. It may be used for comparing the mass loss by
definitive drying specifications, dry specimens in an oven at
tumbling before and after a specific treatment of the insulation,
215 to 250°F (102 to 121°C) to constant mass, and hold in a
as agreed upon by the purchaser and the manufacturer.
desiccator to cool to room temperature before testing. Where
circumstances or requirements preclude compliance with these
conditioning procedures, exceptions agreed upon by the pur-
This test method is under the jurisdiction of ASTM Committee C-16 on
chaser and the manufacturer may be made, but they shall be
Thermal Insulation and is the direct res
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