Designation: A 900/A 900M – 01 (Reapproved 2006)
Standard Test Method for
Lamination Factor of Amorphous Magnetic Strip
1
This standard is issued under the fixed designation A 900/A 900M; 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
1.1 This test method covers measurements of lamination
factor (
Note 1) of a specimen composed of strips cut from
amorphous magnetic material. It is suitable for the determina-
tion of lamination factor for thin, flat case, metallic strip
ranging in width from 0.25 to 8.00 in. [6.35 mm to 203 mm]
and in thickness from 0.0005 to 0.005 in. [12.7 to 127 µm].
NOTE 1—Lamination factor is also termed space factor or stacking
factor.
1.2 The values and equations stated in customary (egs-emu
and inch-pound) or SI units are to be regarded separately as
standard. Within this standard, SI units are shown in brackets.
The values stated in each system may not be exact equivalents;
therefore, each system shall be used independently of the other.
Combining values from the two systems may result in noncon-
formance with this standard.
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. Summary of Test Method
2.1 The laminated test specimen is oriented and aligned,
then subjected to pressure in a compression device. The
resulting volume is then determined from the measured speci-
men height, width, and length. An equivalent solid volume is
calculated from the specimen mass and the true density of the
specimen material. The ratio of the calculated (equivalent
solid) volume to the measured volume is the lamination factor.
3. Significance and Use
3.1 Lamination factor S indicates the deficiency of effective
material volume which is due to the presence of oxides,
roughness, insulating coatings, and other conditions affecting
the strip surface.
3.2 This test method is used to predict the fraction of metal
that is included in the volume of the firm coil wound from the
specimen tape.
4. Interferences
4.1 This test method is predicated on correctly aligned test
strips and uniform compression during test. Both of these
conditions are difficult to meet whenever the test specimens
have one or more elevated ridges running lengthwise along the
surface of the strip.
4.2 This test method also presupposes that the test speci-
mens are free from other defects, such as camber and waviness,
that may affect the lamination factor.
5. Apparatus
5.1 Micrometers—Two types of micrometers are included
for use in this test method as follows:
5.1.1 Motor-Operated, Deadweight (Not Spring) Actuated
Micrometer, conforming to the following requirements:
5.1.1.1 The micrometer shall be a deadweight digital- or
dial-type micrometer, having two ground and lapped circular
surfaces with a capacity of not less than 0.030 in. [0.75 mm].
The movable face or presser foot shall have an area of 0.25 to
0.33 in.
2
[160 to 215 mm
2
] and corresponding to a diameter of
approximately 0.56 to 0.65 in. [14.2 to 16.5 mm]. The fixed
face or anvil shall be of such size that the whole area of the
presser foot is in contact with the anvil in the zero position.
5.1.1.2 The surface shall be parallel to within 0.000 05 in.
[0.0012 mm] and the presser foot shall move on an axis
perpendicular to the anvil.
5.1.1.3 The presser foot shall exert a steady pressure on the
specimen of 7.0 to 8.0 psi [48 to 55 kPa].
5.1.1.4 A digital readout is preferred. If an analog gauge is
used, the dial shall be at least 2 in. [51 mm] in diameter. It shall
be continuously graduated to read directly to 0.0001 in.
[0.0025 mm] and shall be required with a telltale hand, if
necessary, recording the number of complete revolutions of the
large hand.
5.1.1.5 The micrometer shall be capable of repeating its
readings to 0.000 05 in. [0.0012 mm] at zero setting or on a
steel gauge block.
1
This test method is under the jurisdiction of ASTM Committee A06 on
Magnetic Properties and is the direct responsibility of Subcommittee A06.01 on Test
Methods.
Current edition approved May 1, 2006. Published May 2006. Originally
approved in 1991. Last previous edition approved in 2001 as A 900/A 900M – 01.
1
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
Copyright by ASTM Int'l (all rights reserved);
Reproduction authorized per License Agreement with Monique Tyree (ASTMIHS Account); Tue May 30 13:50:53 EDT 2006
Copyright ASTM International
Provided by IHS under license with ASTM
Not for Resale
No reproduction or networking permitted without license from IHS
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