ASTM A900/A900M-01

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Designation: A 900/A 900M – 01
Standard Test Method for
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Lamination Factor of Amorphous Magnetic Strip
ThisstandardisissuedunderthefixeddesignationA900/A900M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers measurements of lamination 4.1 Lamination factor S indicates the deficiency of effective
factor (Note 1) of a specimen composed of strips cut from material volume which is due to the presence of oxides,
amorphous magnetic material. It is suitable for the determina- roughness, insulating coatings, and other conditions affecting
tion of lamination factor for thin, flat case, metallic strip the strip surface.
ranging in width from 0.25 to 8.00 in. [6.35 mm to 203 mm] 4.2 This test method is used to predict the fraction of metal
and in thickness from 0.0005 to 0.005 in. [12.7 to 127 µm]. that is included in the volume of the firm coil wound from the
specimen tape.
NOTE 1—Lamination factor is also termed space factor or stacking
factor.
5. Interferences
1.2 This standard does not purport to address all of the
5.1 This test method is predicated on correctly aligned test
safety concerns, if any, associated with its use. It is the
strips and uniform compression during test. Both of these
responsibility of the user of this standard to establish appro-
conditions are difficult to meet whenever the test specimens
priate safety and health practices and determine the applica-
have one or more elevated ridges running lengthwise along the
bility of regulatory limitations prior to use.
surface of the strip.
1.3 The values and equations stated in customary (egs-emu
5.2 This test method also presupposes that the test speci-
and inch-pound) or SI units are to be regarded separately as
mensarefreefromotherdefects,suchascamberandwaviness,
standard. Within this standard, SI units are shown in brackets.
that may affect the lamination factor.
Thevaluesstatedineachsystemmaynotbeexactequivalents;
therefore,eachsystemshallbeusedindependentlyoftheother. 6. Apparatus
Combining values from the two systems may result in noncon-
6.1 Micrometers—Two types of micrometers are included
formance with this standard.
for use in this test method as follows:
6.1.1 Motor-Operated, Deadweight (Not Spring) Actuated
2. Referenced Documents
Micrometer, conforming to the following requirements:
2.1 ASTM Standards:
6.1.1.1 The micrometer shall be a deadweight digital- or
A 34/A 34M Practice for Sampling and Procurement Test-
dial-type micrometer, having two ground and lapped circular
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ing of Magnetic Materials
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
3. Summary of Test Method
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0.33 in. [160 to 215 mm ] and corresponding to a diameter of
3.1 The laminated test specimen is oriented and aligned,
approximately 0.56 to 0.65 in. [14.2 to 16.5 mm]. The fixed
then subjected to pressure in a compression device. The
face or anvil shall be of such size that the whole area of the
resulting volume is then determined from the measured speci-
presser foot is in contact with the anvil in the zero position.
men height, width, and length. An equivalent solid volume is
6.1.1.2 The surface shall be parallel to within 0.00005 in.
calculated from the specimen mass and the true density of the
[0.0012 mm] and the presser foot shall move on an axis
specimen material. The ratio of the calculated (equivalent
perpendicular to the anvil.
solid) volume to the measured volume is the lamination factor.
6.1.1.3 The presser foot shall exert a steady pressure on the
specimen of 7.0 to 8.0 psi [48 to 55 kPa].
1 6.1.1.4 A digital readout is preferred. If an analog gage is
This test method is under the jurisdiction of ASTM Committee A06 on
used,thedialshallbeatleast2in.[51mm]indiameter.Itshall
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
Methods.
be continuously graduated to read directly to 0.0001 in.
Current edition approved Oct. 10, 2001. Published December 2001. Originally
e1
published as A900-91. Last previous edition A900-91 (1996) .
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Annual Book of ASTM Standards, Vol 03.04.
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A 900/A 900M – 01
[0.0025 mm] and shall be required with a telltale hand, if 8. Procedure
necessary,recordingthenumberofcompleterevolutionsofthe
8.1 Select a representative segment from each sample of
large hand.
material to be tested and cut the required number of st
...