ASTM D7129-09

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Designation: D7129 − 09
StandardTest Method for
Determination of Ammonia Trapping in a Grafted Battery
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Separator
This standard is issued under the fixed designation D7129; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* the solution is cooled, the solutions are distilled to determine
the amount of ammonia the separator retained.
1.1 This test method covers the measurement of the ability
of a material to capture ammonia. 4.2 Results are calculated as mol/g using the appropriate
equations.
1.2 Thistestmethodisintendedprimarilyfortestinggrafted
polyolefin materials used as a battery separator, although other
5. Significance and Use
materials could be tested.
5.1 Nickel metal hydride (Ni-MH) cells/batteries can ex-
1.3 The values stated in SI units are to be regarded as
hibithighself-dischargerates.Nitrateimpuritiesinthepositive
standard. No other units of measurement are included in this
electrodecanbereducedtoammoniaonthenegativeelectrode.
standard.
This causes rapid self-discharge. Technical publications have
reported a link between the separator ammonia trapping
1.4 This standard does not purport to address all of the
capabilities and the cells charge retention. Grafted polyolefin
safety concerns, if any, associated with its use. It is the
separators can absorb or trap these impurities—hence, reduc-
responsibility of the user of this standard to establish appro-
ing self-discharge rates. The level of ammonia trapping from
priate safety and health practices and determine the applica-
this method gives an indication of the efficiency of a separator
bility of regulatory limitations prior to use.
to trap these contaminates, thus helping a battery self discharge
2. Referenced Documents ( charge retention). A higher value should allow a cell to have
2 greater charge retention.
2.1 ASTM Standards:
D123 Terminology Relating to Textiles
6. Apparatus
E438 Specification for Glasses in Laboratory Apparatus
6.1 Flask, Erlenmeyer, wide mouth, 250 mLcapacity with a
E1272 Specification for Laboratory Glass Graduated Cylin-
screw cap.
ders
6.2 Flask, Erlenmeyer, wide mouth, 500 mL capacity.
3. Terminology
6.3 Cylinder, Graduated, Class A, 250 mL capacity.
3.1 Definitions:
NOTE 1—The tolerance on the accuracy of the graduations in Specifi-
3.1.1 For definitions on other textile terms in this test
cationE1272forthisapparatusis 61.4mL.Ifgreateraccuracyisrequired
for a test result, the graduated trap(s) should be calibrated.
method, refer to Terminology D123
6.4 Pipette, Volumetric, Class A, 10 mL capacity.
4. Summary of Test Method
NOTE 2—The tolerance on the accuracy of the graduations in Specifi-
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4.1 A predetermined amount of separator and ammonium
cation E438 for this apparatus is 60.02 mL . If greater accuracy is
hydroxide is added together in a KOH solution.The specimens required for a test result, the graduated trap(s) should be calibrated
are conditioned under a controlled temperature for 24 h. After
6.5 Pipette, Volumetric, Class A, 3- mL capacity.
NOTE 3—The tolerance on the accuracy of the graduations in Specifi-
cationE438forthisapparatusis 60.01mL.Ifgreateraccuracyisrequired
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This test method is under the jurisdiction of ASTM Committee D09 on
for a test result, the graduated trap(s) should be calibrated.
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.19 on Dielectric Sheet and Roll Products.
6.6 Distillation Unit, Micro or macro Kjeldhal apparatus.
Current edition approved Oct. 1, 2009. Published November 2009. Originally
6.7 Oven.
approved in 2005. Last previous edition approved in 2005 as D7129 – 05. DOI:
10.1520/D7129-09.
7. Reagents
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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
7.1 Ammonium Hydroxide, 0.3M(NH OH), ACS grade.
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Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 7.2 Hydrochloric Acid, 0.1M (HCL), ACS grade.
*A Summary of Changes section appears at the end of this standard
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D7129 − 09
7.3 Methyl Red, ACS grade. 9.4 Measure out 100 mLof the solution in 9.1 and washings
and add to the distillation tube.
7.4 Potassium Hydroxide Solution, 8M—Prepare a sufficient
quantity of KOH solution for the testing program immediately 9.5 Place tube into the machine.
at hand as follows.
9.6 Place receiving flask into the machine.
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