ASTM C421-00
(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:C421–00
Standard Test Method for
Tumbling Friability of Preformed Block-Type Thermal
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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 tumbling before and after a specific treatment of the insulation,
as agreed upon by the purchaser and the manufacturer.
1.1 This test method covers determination of the mass loss
of preformed block-type thermal insulation as a result of a
5. Apparatus
combination of abrasion and impact produced by a laboratory
5.1 Box—Acubical box of oak wood, having inside dimen-
tumbling mechanism.
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sions of 7 ⁄2 by 7 ⁄4 by 7 ⁄4 in. (190 by 197 by 197 mm),
1.2 The values stated in inch-pound units are to be regarded
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mounted rigidly at the center of one 7 ⁄4 by 7 ⁄4 in. (197 by 197
as the standard. The values in parentheses are provided for
mm) end, so that the axis normal to a face of the box is that of
information only.
a rotatable horizontal shaft. One side of the box shall be hinged
1.3 This standard does not purport to address all of the
as a door and shall be gasketed to be dust-tight. The box shaft
safety concerns, if any, associated with its use. It is the
shall be motor driven at a constant speed of 60 6 2 r/min.
responsibility of the user of this standard to establish appro-
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5.2 Cubes—Twenty-four room-dry, solid oak, ⁄4 6 ⁄32-in.
priate safety and health practices and determine the applica-
(19 6 0.8-mm) cubes shall be placed in the box with the test
bility of regulatory limitations prior to use.
specimens. The specific gravity of the oak cubes shall be
2. Referenced Documents approximately 0.65; white oak meets this requirement.
2.1 ASTM Standards:
NOTE 1—Number each group of wood cubes 1 through 24. At the end
C 167 Test Methods for Thickness and Density of Blanket
of every 600-revolution test, remove one “used” cube (follow the number
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sequence and remove the oldest cube) and replace with a correspondingly
or Batt Thermal Insulations
numbered “new” cube. In this manner, cube wear is eliminated as an
C 168 Terminology Relating to Thermal Insulating Materi-
2 uncontrolled variable in the test method. When the corners of the wood
als
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cubes have been worn so that the radius of curvature is greater than ⁄16 in.
C 303 Test Method for Density of Preformed Block-Type
(1.6 mm) or the cubes have become altered so as not to be comparable
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Thermal Insulation
with new cubes, they shall be discarded and new ones used. A conven-
tional machinist’s radius gage may be used for checking the edge wear.
3. Terminology
6. Test Specimens
3.1 Definitions—Definitions pertaining to thermal insulat-
ing materials are defined in Terminology C 168.
6.1 Cut the insulation with a fine-tooth saw (similar to a
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16-tooth band saw) into 1 6 ⁄16-in. (25.4 6 1.6-mm) cubes.
4. Significance and Use
6.2 Test twelve cubes at a time cut from one piece of
4.1 Several test methods for measuring mass loss by abra-
insulation. When flat insulation has special surfaces due to
sion and impact of preformed block-type thermal insulation
treatment or molding, cut each cube to include such special
have been used to some extent in the past. It is felt that no
surfaces as one face, except that the edges and corners of the
single test method completely covers all factors involving such
insulation shall not be used.
forces for different kinds of materials, but this test method is
6.3 Dry and condition specimens prior to test, following
intended to provide a procedure that will give reproducible
applicable specifications for the material. If the material is
results. It may be used for comparing the mass loss by
adversely affected by oven temperatures, then condition speci-
mens for not less than 40 h at 73.46 1.8°F (23 6 1°C), and 50
6 5 % relative humidity before testing. In the absence of
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This test method is under the jurisdiction ofASTM Committee C16 onThermal
definitive drying specifications, dry specimens in an oven at
Insulation and is the direct responsibility of Subcommittee C16.32 on Mechanical
215 to 250°F (102 to 121°C) to constant mass, and hold in a
Properties.
Current edition approved Oct. 10, 2000. Published December 2000. Originally desiccator to cool to room temperature before testing. Where
published as C 421 – 58 T. Last previous edition C 421 – 95.
circumstances or requirements preclude compliance with these
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Annual Book of ASTM Standards, Vol 04.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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