ASTM D3349-99
(Test Method)Standard Test Method for Absorption Coefficient of Ethylene Polymer Material Pigmented with Carbon Black
Standard Test Method for Absorption Coefficient of Ethylene Polymer Material Pigmented with Carbon Black
SCOPE
1.1 This test method measures the amount of light transmitted through a film of black pigmented ethylene polymer.
1.2 Taking into account the amount of light and film thickness, an absorption coefficient is calculated.
1.3 This standard does not purport to address all of the safety problems, 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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An American National Standard
Designation:D3349–99
Standard Test Method for
Absorption Coefficient of Ethylene Polymer Material
1
Pigmented with Carbon Black
This standard is issued under the fixed designation D 3349; 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 response to prolonged exposure to ultraviolet light as evi-
denced by minimal changes in specific properties.
1.1 This test method measures the amount of light transmit-
ted through a film of carbon black pigmented ethylene poly-
NOTE 1—This test method was developed to evaluate ethylene polymer
mer.
materialspigmentedwithsmallparticlesizecarbonblackssuitableforUV
protection. It is not known how accurate and reproducible the test would
1.2 Taking into account the amount of light and film
be with larger particle size blacks.
thickness, an absorption coefficient is calculated.
1.3 Whenever two sets of values are presented, in different
5. Apparatus
units, the values in the first set are the standard, while those in
5.1 Spectrophotometer—An instrument in accordance with
parentheses are for information only.
Practice E 60 is required.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
NOTE 2—Consult the spectrophotometer’s operation manual or consult
responsibility of the user of this standard to establish appro- the manufacturer of the instrument for the calibration procedure.
priate safety and health practices and determine the applica-
5.2 Mold—A mold in accordance with Figs. 1 and 2. Make
bility of regulatory limitations prior to use.
the mold of Ketos steel (or equivalent) hardened to Rockwell
C45, with mold surfaces chromium plated to 0.005-mm
2. Referenced Documents
(0.0002-in.) minimum thickness.
2.1 ASTM Standards:
5.3 Specimen Holder—Cut two concentric rings from
E 60 Practice for Molecular Absorption Spectrometric
phenolic-paper laminate or other suitable material to the
Methods for Chemical Analysis of Metals, Ores, and
dimensions shown in Fig. 3. These rings should make a snug
2
Related Materials
slip-fit one within the other.
D 1248 Specification for Polyethylene Plastics Extrusion
5.4 Reference Material—A reference material is required
3
Materials for Wire and Cable
having an absorbance value of 1.0 to 1.2 at 375 nm as
measured by the instrument used for testing.
3. Summary of Test Method
4
5.4.1 Neutral Density Filter, M-type carbon 0.85 density,
3.1 The transmission of light of a specified wavelength
laminated between cellulose acetate sheets has been found
through thin ethylene polymer film is measured. The result is
satisfactory. Since this material is furnished as a rigid sheet, it
used to calculate an absorption coefficient that is a reciprocal
cannot be mounted as described in Section 7. Instead, a special
function of transmission after correction for thickness.
mount must be prepared by cutting Ring 1 of Fig. 3 in half
around its circumference to give two rings about 2 mm (0.08
4. Significance and Use
in.) thick. Cut a 22-mm (0.87-in.) circle from the laminated
4.1 The absorption coefficient of polyolefin polymer pig-
filter, sandwich this between the two 2-mm rings, and slide the
mented with carbon black is useful to judge the degree and
outer ring (Ring 2 of Fig. 3) over this composite.
uniformity of dispersion of the pigment, and the adequacy of
5.4.2 An alternative reference material can be prepared by
the quantitative level of pigment addition. These factors are
any user of this test method. An alternative reference material
used to predict the performance of the polymer material in
consisting of a highly uniform sample of ASTM Type I
polyethylene (see Specification D 1248) containing about 1 %
of a 20-nm carbon black (either channel or furnace type) may
1
This test method is under the jurisdiction of ASTM Committee D-9 on
be prepared on a laboratory mill, and a uniform film of this
Electrical and Electronic Insulating Materials and is the direct responsibility of
material pressed out and mounted as in Section 8 to meet the
Subcommittee D09.18 on Solid Insulations, Non-Metallic Shieldings, and Cover-
ings for Electrical and Telecommunications Wires and Cables.
Current edition approved March 10, 1999. Published June 1999. Originally
published as D 3349 – 74. Last previous edition D 3349 – 93.
2 4
Annual Book of ASTM Standards, Vol 03.05. The Kodak neutral density filter, No. 5 is available from the Eastman Kodak
3
Annual Book of ASTM Standards, Vol 08.01. Co.
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