ASTM C366-99

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Designation:C366–99
Standard Test Methods for
Measurement of Thickness of Sandwich Cores
This standard is issued under the fixed designation C 366; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1 These test methods cover plant manufacturing proce-
dures for measuring the thickness of flat sandwich cores. The
two test methods covered are the following:
1.1.1 Test Method A—Roller-Type Thickness Tester and
1.1.2 Test Method B—Disk-Type Thickness Tester.
1.2 The values stated in SI are to be regarded as the
standard. The inch-pound units given may be approximate.
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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Significance and Use
2.1 Normally a close tolerance is desirable for core thick-
ness so that sandwich panels may be manufactured with all the
sandwich components fitting properly and without crushing the
core.
2.2 These test methods are designed for measuring thick-
ness of core as it is produced and are not intended for use in
determining dimensions of core specimens for other tests.
2.3 These test methods provide standard methods of obtain-
ing the core thickness of flat sandwich core materials and
provide a basis for determining average thickness dimensions.
3. Apparatus
3.1 Test Method A—Roller-Type Thickness Tester:
3.1.1 Roller-Type Thickness Tester, consisting of a flat table
with a rigid yoke framework attached, as shown in Fig. 1. Two
rollers shall be mounted on this yoke, one fixed in position and
one movable in the vertical direction. The vertical movement
FIG. 1 Roller-Type Thickness Tester
of the upper roller shall be translated to a dial gage, calibrated
in 0.01-mm (0.001-in.) increments, that registers the amount of
(0.25 in.) above the surface of the table. The upper roller shall
variation above or below a preset nominal dimension. The
exert a force of 18 N (4 lb) on the core material.
lower roller shall be fixed in position so that it projects 6 mm
3.2 Method B—Disk-Type Thickness Tester:
3.2.1 Disk-Type Thickness Tester, consisting of a flat table
These test methods are under the jurisdiction of ASTM Committee D-30 on
with a rigid yoke framework attached, as shown in Fig. 2. A
Composite Materials and is the direct responsibility of Subcommittee D30.09 on
25-mm (1-in.) diameter presser disk movable in a vertical
Sandwich Construction.
direction shall be mounted on the yoke.The vertical movement
Current edition approved Oct. 10, 1999. Published February 2000. Originally
published as C 366 – 55T. Last previous edition C 366 – 57(1999). of the disk shall be translated to a dial gage, calibrated in
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C366
FIG. 2 Disk-Type Thickness Tester
0.01-mm (0.001-in.) increments, that registers the amount of measured. With the disk automatically reciprocating vertically,
variation above or below a preset nominal dimension. The disk move the core in a saw tooth pattern along the length of the
shall exert a force of 24 N (5.5 lb) on the core material. specimen and observe the dial gage
...