ASTM D2583-95(2001)e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
e1
Designation:D2583–95 (Reapproved 2001)
Standard Test Method for
Indentation Hardness of Rigid Plastics by Means of a Barcol
Impressor
This standard is issued under the fixed designation D 2583; 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.
e NOTE—Editorial changes were made throughout in November 2001.
1. Scope 4. Summary of Test Method
1.1 Thistestmethodcoversthedeterminationofindentation 4.1 Amaterial’s surface hardness is determined through the
hardness of both reinforced and nonreinforced rigid plastics use of a Barcol Impressor. The relative depth of penetration of
using a Barcol Impressor, Model No. 934-1 and Model No. the Impressor’s indentor provides a comparative measure of
935. the material’s hardness. The Model No. 934–1 and Model No.
1.2 The values stated in SI units are to be regarded as the 935 Barcol Impressors are designated for use.Within the range
standard. The values given in parentheses are for information of hardness measured by these Impressors the Model No.
only. 934-1 is used for measuring harder materials and the Model
1.3 This standard does not purport to address all of the No. 935 is used for measuring softer materials.
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.1 The Barcol Impressor is portable and therefore suitable
for testing the hardness of fabricated parts and individual test
bility of regulatory limitations prior to use.
specimens for production control purposes.
NOTE 1—There is currently no ISO standard that duplicates this test
5.2 Before proceeding with this test method, reference
method.
shouldbemadetothespecificationofthematerialbeingtested.
2. Referenced Documents Any test specimen preparation, conditioning, dimensions, or
2 testing parameters or combination thereof covered in the
2.1 ASTM Standards:
relevant ASTM materials specification shall take precedence
D 618 Practice for Conditioning Plastics for Testing
over those mentioned in this test method. If there are no
D 883 Terminology Relating to Plastics
relevantASTM material specifications, then the default condi-
D 4000 Classification System for Specifying Plastic Mate-
tions apply. Table 1 of Classification System D 4000 lists the
rials
ASTM materials standards that currently exist.
D 4805 Terminology for Plastics Standards
E 691 Practice for Conducting an Interlaboratory Study to
6. Apparatus (Fig. 1 and Fig. 2)
Determine the Precision of a Test Method
6.1 Indentor —The indentor shall consist of a hardened
3. Terminology steel truncated cone having an angle of 26° with a flat tip of
0.157 mm (0.0062 in.) in diameter. It shall fit into a hollow
3.1 Definitions—For definitions of technical terms pertain-
spindle and be held down by a spring-loaded plunger. See Fig.
ing to plastics used in this test method, see Terminology D 883
2.
or Terminology D 4805.
6.2 Indicating Device—The indicating dial shall have 100
divisions, each representing a depth of 0.0076-mm (0.0003-in.)
This test method is under the jurisdiction ofASTM Committee D20 on Plastics penetration. The higher the reading the harder the material.
and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.
6.3 Calibration Standards—“Hard” and “soft” aluminum
Current edition approved October 10, 1995. Published December 1995. Origi-
alloy disks supplied by the manufacturer of the instrument.
nally published as D 2583 – 67. Last previous edition D 2583 – 93.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Apparatus is available from Eurotherm/Barber-Colman, 741–F Miller Drive,
the ASTM website. Leesburg, VA 20175–8993.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
e1
D2583–95 (2001)
TABLE 1 Recommended Sample Sizes to Equalize the Variance
thickness, so that the indentor is perpendicular to the surface
of the Average for Model No. 934-1
being tested. Grasp the instrument firmly between the legs and
Homogeneous Material
point sleeve. Apply a uniform downward force quickly, by
Hardness Reading Coefficient of Variance Minimum
hand, increasing the force on the case until the dial indication
M-934 Variance Variation, % of Number of
reaches a maximum (Note 3). Take care to avoid sliding or
Scale Average Readings
scraping while the indentor is in contact with the surface being
20 2.47 2.6 0.27 9
tested. Record the maximum reading.
30 2.20 1.7 0.28 8
40 1.93 1.3 0.27 7
NOTE 2—It is recommended that measurements be made with the
50 1.66 1.1 0.28 6
Model 934-1 Impressor when values above 90 are obtained with the
60 1.39 0.9 0.28 5
Model 935 Impressor and that measurements be made with the Model 935
70 1.12 0.8 0.28 4
80 0.85 0.7 0.28 3 Impressor when values less than 20 are obtained with the Model No.
934-1 Impressor. Values below 10 using the Model 935 Impressor are
Nonhomogeneous Material
inexact and should not be reported.
(Reinforced Plastics)
NOTE 3—Drift in readings from the maximum may occur in some
30 22.4 2.9 0.77 29
materials and can be nonlinear with time.
40 17.2 2.2 0.78 22
50 12.0 1.7 0.75 16
9. Calibration
60 7.8 1.5 0.78 10
70 3.6 1.2 0.75 5
9.1 With the plunger upper guide backed out until it just
engages the spring, place the Impressor on a glass surface and
press down until the point is forced all the way back into the
lower plunger guide. The indicator should now read 100. If it
does not, loosen the lock-nut and turn the lower plunger guide
in or out to obtain a 100 reading. Next, read the “hard”
aluminum alloy disk supplied by the manufacturer of the
Impressor and, if necessary, adjust so that the reading is within
the range marked on the disk.Then do the same with the “soft”
disk. If these readings cannot be obtained, subsequent mea-
surements are not valid.
10. Conditioning
10.1 Conditioning—Condition the test specimens at 23 6
2°C(73.4 63.6°F)and50 65 %relativehumidityfornotless
than 40 h prior to test in accordance with Procedure A of
Practice D 618, unless otherwise specified by the contract or
relevant ASTM material specification. In cases of disagree-
ment, the tolerances shall be 61°C (61.8°F) and 62%
FIG. 1 Barcol Impressor
relative humidity.
10.2 Test Conditions—Conduct tests in the standard labora-
Other disks should not be used, even if they are of the same
tory atmosphere of 23 6 2°C (73.4 6 3.6°F) and 50 6 5%
alloy and temper as the manufacturer’s disks, as the hardness
relative humidity, unless otherwise specified by the contract or
of aluminum may vary within any given alloy-temper param-
relevant ASTM material specifi
...