ASTM D4350-00(2005)
(Test Method)Standard Test Method for Corrosivity Index of Plastics and Fillers
Standard Test Method for Corrosivity Index of Plastics and Fillers
SIGNIFICANCE AND USE
This test method provides a means for comparing the corrosive potential of plastics and fillers in humid atmospheres.
This test method is intended for use in research and evaluation.
SCOPE
1.1 This test method is designed for use in obtaining the specific conductance of a water extract of plastics and fillers. The magnitude of this conductance may be taken as an index of the likelihood that, in a humid atmosphere, metal surfaces in contact with these materials may become corroded due to galvanic action or direct chemical attack; this is called the corrosivity index. Note 1There is no similar or equivalent ISO standard.
1.2 The values stated in SI units are to be regarded as standard.
This standard does not purport to address all of the safety concerns, 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. Specific precautionary statements are given in Section .
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D4350 −00(Reapproved 2005)
Standard Test Method for
Corrosivity Index of Plastics and Fillers
This standard is issued under the fixed designation D4350; the number immediately following the designation indicates the year 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope time. The specific resistance of each of the solutions extracted
from the test specimens is measured by using the specified
1.1 This test method is designed for use in obtaining the
conductivity cell. The specific conductance is calculated from
specific conductance of a water extract of plastics and fillers.
the data and is called the corrosivity index of the material.
The magnitude of this conductance may be taken as an index
ofthelikelihoodthat,inahumidatmosphere,metalsurfacesin
4. Significance and Use
contact with these materials may become corroded due to
4.1 This test method provides a means for comparing the
galvanic action or direct chemical attack; this is called the
corrosivity index. corrosivepotentialofplasticsandfillersinhumidatmospheres.
4.2 This test method is intended for use in research and
NOTE 1—There is no similar or equivalent ISO standard.
evaluation.
1.2 The values stated in SI units are to be regarded as
standard.
5. Apparatus
1.3 This standard does not purport to address all of the
5.1 Conductance Bridge, Wheatstone type, with a range
safety concerns, if any, associated with its use. It is the
from 1 to 250 000-Ω measured resistance, a built-in
responsibility of the user of this standard to establish appro-
potentiometer, a 1000 6 50-cycles per second oscillator, and a
priate safety and health practices and determine the applica-
sensitive null point indicator. The bridge shall be capable of
bility of regulatory limitations prior to use. Specific precau-
measuring resistance with an accuracy of 62%.
tionary statements are given in Section 7.
5.2 Conductivity Cell, dip-type, micro, for solutions of
2. Referenced Documents
medium conductance. The cell should have a cell constant of
−1
2.1 ASTM Standards:
approximately 1.0 cm . The borosilicate glass shall have a
D618Practice for Conditioning Plastics for Testing
maximum outside tube diameter of 12.7 mm, overall length of
D1193Specification for Reagent Water
177.8 mm, chamber inside diameter of 9.5 mm, and chamber
E1Specification for ASTM Liquid-in-Glass Thermometers
depth of 50.8 mm.
E11Specification forWovenWireTest Sieve Cloth andTest
5.3 Drill, electric, capable of holding a 10.54-mm drill bit,
Sieves
and rotating at 500-r/min maximum speed.
E145Specification for Gravity-Convection and Forced-
5.4 Mill,suchaslaboratoryWileycuttingmillorequivalent.
Ventilation Ovens
E691Practice for Conducting an Interlaboratory Study to
5.5 Sieves, standard (alternative) sieve designations 425 µm
Determine the Precision of a Test Method
(No. 40), and 250 µm (No. 60) in accordance with Specifica-
tion E11.
3. Summary of Test Method
5.6 Analytical Balance, capable of determining mass to the
3.1 Specimensofplasticsorfillersareimmersedindistilled
nearest 1.0 mg.
water and exposed to specified conditions of temperature and
5.7 Oven, forced-ventilation type, with uniformity of tem-
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics
perature within 61% of the differential between oven and
and is the direct responsibility of Subcommittee D20.16 on Thermosetting Materi-
als.
Current edition approved Nov. 1, 2005. Published January 2006. Originally
approved in 1984. Last previous edition approved in 2000 as D4350-00. DOI: The sole source of supply of the conductivity cell (Model No. 3403) known to
10.1520/D4350-00R05. the committee at this time is Yellow Springs Instrument Co., Inc., P.O. Box 279,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or YellowSprings,OH45387.Ifyouareawareofalternativesuppliers,pleaseprovide
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM this information toASTM International Headquarters. Your comments will receive
Standards volume information, refer to the standard’s Document Summary page on careful consideration at a meeting of the responsible technical committee, which
the ASTM website. you may attend.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D4350−00 (2005)
FIG. 1 Specific Conductance of 0.0100 Demal KCl
ambienttemperature,witharateofventilationof100to200air at 23 6 2°C, the water shall have a calculated specific
−6 −1 −1
changesperhour,inaccordancewithSpecificationE145,Type conductance of less than 2.0×10 , ohm ,cm .
IIA.
6.2 Potassium Chloride Solution, consisting of 0.7453 g of
5.8 Thermometer, solid-stem, precision,ASTM No. 63C, in reagent grade potassium chloride, previously dried at 105 6
accordance with Specification E1. 3°Cforatleast24h,dissolvedin1000gofdistilledwater.The
solution shall be stored in a borosilicate glass stoppered bottle.
5.9 Chemical Glassware:
Thespecificconductanceofthis0.0100DemalKClsolutionis
5.9.1 Borosilicate Glass Flask, nominally 1000-mL size,
−1 −1 −1 −1
0.0007736 ohm ,cm at 0°C, 0.0012205 ohm ,cm at
with ground glass stopper.
−1 −1 4
18°C, and 0.0014087 ohm ,cm at 25°C. This specific
5.9.2 Borosilicate Glass Erlenmeyer Flask, 65-mL actual
conductance versus temperature is plotted in Fig. 1.
capacity to bottom of stopper (nominally 50-mL size), with
ground glass stopper No. 19. 6.3 Grease,silicone,notsolubleinwaternorcontainingany
5.9.3 Pipet, volumetric, 50-mL capacity, calibrated “to de- water-soluble constituents. In the control specimens, water
liver.”
6. Reagents and Materials SpecificconductancevaluesarebasedontheworkofJones,G.,andBradshaw,
B. C., J. Amer. Chem. Soc., 55 (1933) 1780. For more detailed information on the
6.1 Distilled Water, Type III, reagent water as defined in
use of Demal KCl, see“ Electrolyte Solutions,” by Robinson, R.A., and Stokes, R.
Specification D1193. When stored in borosilicate glass bottles H., Academic Press, Inc., New York, 1955, pp. 94–96.
D4350−00 (2005)
exposed to the grease on the stopper shall have a specific 12.5 At the end of 288 6 2 h, remove the stoppered flasks
−6 −1 −1
conductance less than 7×10 , ohm ,cm . from the oven and allow them to cool to 23 6 2°C. Again
agitate the flasks thoroughly and allow the solids to settle.
7. Safety Hazards
12.6 Determine the cell constant of the conductivity cell.
7.1 Some plastics and fillers are known to contain toxic
12.6.1 Pipet 50.0 mL of 0.0100 Demal KCl into each of
components and special precautions are required in handling.
three Erlenmeyer flasks, and allow to come to 23 6 2°C.
Themanufacturer’sprecautionaryinstructionsandsoundlabo-
12.6.2 Use a thermometer to determine the temperature to
ratory safety practices should be diligently followed.
thenearest0.1°Coftheliquidintheflaskimmediatelypriorto
the time of specific resistance measurements.
8. Sampling
12.6.3 Dip the conductivity cell vertically into the liquid
until the bottom edge of the cell rests on the bottom of the
8.1 Because of the diverse nature of plastics and fillers, and
flask.
the various forms and packages commercially available, no
12.6.4 Meas
...
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