ASTM F1277-95

Designation: F 1277 – 95
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Determination of Leachable Chloride in Packing and
1
Gasketing Materials by Ion-Selective Electrode Technique
This standard is issued under the fixed designation F 1277; 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 concentration of the test solution is determined from the
calibration curve, and this value is used to calculate the amount
1.1 This test method provides for the measurement of
of chloride in parts per million that was leached from the
chloride ion leached from flexible graphite, asbestos, or paper-
packing or gasketing material. The calibration and test solu-
based packing and gasketing materials. Samples containing 7
-
tions must be measured at the same temperature [within 61°C
to 6700 μg Cl /g sample can be analyzed with this procedure.
(62°F)].
The upper concentration limit can be extended by dilution of
3.3 The calibration and test solutions are diluted with ionic
the test solution.
strength adjustor which also minimizes possible interferences
1.2 It is the responsibility of the analyst to ensure the
such as ammonia, bromide, iodide, cyanide, or sulfide (see Test
validity of this test method for other packing or gasketing
Methods D 512).
materials.
1.3 The values stated in SI units are to be regarded as the
4. Significance and Use
standard. The values given in parentheses are for information
4.1 Chloride ion is highly detrimental to the valves, flanges,
only.
piping, etc. of stainless steel and copper-bearing alloys em-
1.4 This standard does not purport to address all of the
ployed in certain types of facilities, such as nuclear and
safety concerns, if any, associated with its use. It is the
chemical plants. Therefore, the amount of chloride ion that can
responsibility of the user of this standard to establish appro-
be leached from packing and gasketing materials used in these
priate safety and health practices and determine the applica-
facilities must be controlled closely for prevention of damage.
bility of regulatory limitations prior to use. A specific warning
This test method is suitable for manufacturing control and for
statement is given in 8.3.
verifying that the packing and gasketing material meets speci-
2. Referenced Documents fications.
4.2 It is assumed that the users of this test method will be
2.1 ASTM Standards:
2
analysts capable of performing common laboratory procedures
D 512 Test Methods for Chloride Ion in Water
skillfully and safely.
E 50 Practices for Apparatus, Reagents, and Safety Precau-
3
tions for Chemical Analysis of Metals
5. Interferences
E 691 Practice for Conducting an Interlaboratory Study to
4
5.1 There is no interference from up to 500 μg/mL of
Determine the Precision of a Test Method
sulfide, 1000 μg/mL of bromide or iodide, a one hundred-fold
3. Summary of Test Method
excess of cyanide over chloride, or 1000 μg/mL of ammonia.
Ferric, cupric, and permanganate ions do not interfere. Mer-
3.1 Chloride ion leached from packing and gasketing mate-
cury must not be present.
rials is measured potentiometrically using a chloride ion-
selective electrode in conjunction with a double junction,
6. Apparatus
sleeve-type reference electrode. Potentials are read using a
6.1 Digital pH/mV Meter, with 0.1 mV readability pre-
pH/mV meter having 0.1 mV readability.
ferred, but 1 mV readability is acceptable.
3.2 A calibration curve is prepared by plotting the potentials
-
6.2 Chloride Ion-Selective Electrode (Cl ) , having a silver
of known chloride solutions versus the corresponding concen-
chloride (AgCl) membrane.
trations expressed in micrograms per millilitre. The chloride
NOTE 1—Caution: Chloride ion-selective electrodes with a silver
chloride/silver sulfide membrane are not suitable as the sulfide can be
1
This test method is under the jurisdiction of ASTM Committee F-3 on Gaskets
oxidized by the ionic strength adjustor used in this procedure.
and is the direct responsibility of Subcommittee F03.50 on Analytical Test Methods.
Current edition approved June 15, 1995. Published August 1995. Originally 6.3 Sleeve-Type Double Junction Reference Electrode.
published as F 1277 – 90. Last previous edition F 1277 – 90.
2
NOTE 2—Other types of double junction reference electrodes may be
Annual Book of ASTM Standards, Vol 11.01.
3
suitable, but supporting data included in this test method were obtained
Annual Book of ASTM Standards, Vol 03.05.
4
Annual Book of ASTM Standards, Vol 14.02. with only the recommended type.
1

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F 1277
samples, precautions should be ta
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