ASTM D4350-16(2022)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D4350 −16 (Reapproved 2022)
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 U.S. Department of Defense.
1. Scope E691Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
1.1 This test method is designed for use in obtaining the
E2251Specification for Liquid-in-Glass ASTM Thermom-
specific conductance of a water extract of plastics and fillers.
eters with Low-Hazard Precision Liquids
The magnitude of this conductance, called the corrosivity
index, is an index of the likelihood that, in a humid
3. Terminology
atmosphere, metal surfaces in contact with these materials can
3.1 Definitions of Terms—For definitions of terms used in
be corroded due to galvanic action or direct chemical attack.
this test method associated with plastics issues refer to the
NOTE 1—There is no known ISO equivalent to this standard.
terminology contained in Terminology D883.
1.2 The values stated in SI units are to be regarded as
standard. 4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 This test method provides a means for comparing the
safety concerns, if any, associated with its use. It is the
corrosivepotentialofplasticsandfillersinhumidatmospheres.
responsibility of the user of this standard to establish appro-
4.2 This test method is intended for use in research and
priate safety, health, and environmental practices and deter-
evaluation.
mine the applicability of regulatory limitations prior to use.
Specific precautionary statements are given in Section 7.
5. Apparatus
1.4 This international standard was developed in accor-
5.1 Conductance Bridge, Wheatstone type, with a range
dance with internationally recognized principles on standard-
from 1 to 250 000-Ω measured resistance, a built-in
ization established in the Decision on Principles for the
potentiometer, a 1000 6 50-cycles per second oscillator, and a
Development of International Standards, Guides and Recom-
sensitive null point indicator. The bridge shall be capable of
mendations issued by the World Trade Organization Technical
measuring resistance with an accuracy of 62%.
Barriers to Trade (TBT) Committee.
5.2 Conductivity Cell, dip-type, micro, for solutions of
2. Referenced Documents
medium conductance.The cell needs to have a cell constant of
−1
approximately 1.0 cm . The borosilicate glass shall have a
2.1 ASTM Standards:
maximum outside tube diameter of 12.7 mm, overall length of
D618Practice for Conditioning Plastics for Testing
177.8 mm, chamber inside diameter of 9.5 mm, and chamber
D883Terminology Relating to Plastics
depth of 50.8 mm.
D1193Specification for Reagent Water
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
5.5 Sieves, standard (alternative) sieve designations 425 µm
(No. 40), and 250 µm (No. 60) in accordance with Specifica-
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics
tion E11.
and is the direct responsibility of Subcommittee D20.16 on Thermosetting Materi-
als.
Current edition approved Nov. 1, 2022. Published November 2022. Originally
approved in 1984. Last previous edition approved in 2016 as D4350-16. DOI: The sole source of supply of the conductivity cell (Model No. 3403) known to
10.1520/D4350-16R22. 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
D4350−16 (2022)
FIG. 1 Specific Conductance of 0.0100 Demal KCl
5.6 Analytical Balance, capable of determining mass to the 5.9.2 Borosilicate Glass Erlenmeyer Flask, 65-mL actual
nearest 1.0 mg. capacity to bottom of stopper (nominally 50-mL size), with
ground glass stopper No. 19.
5.7 Oven, forced-ventilation type, with uniformity of tem-
5.9.3 Pipet, volumetric, 50-mL capacity, calibrated “to de-
perature within 61% of the differential between oven and
liver.”
ambienttemperature,witharateofventilationof100to200air
changesperhour,inaccordancewithSpecificationE145,Type
6. Reagents and Materials
IIA.
6.1 Distilled Water, Type III, reagent water as defined in
5.8 Thermometer, solid-stem, precision, ASTM No. S63C,
Specification D1193. When stored in borosilicate glass bottles
in accordance with Specification E2251. Temperature measur-
at 23 6 2°C, the water shall have a calculated specific
ing devices with equivalent accuracy and characteristics, such
−6 −1 −1
conductance of less than 2.0×10 , ohm ,cm .
as RTDs and thermistors, are permitted. Additionally, use of
ASTM No. S63C in accordance with Specification E2251 is
6.2 Potassium Chloride Solution, consisting of 0.7453 g of
acceptable.
reagent grade potassium chloride, previously dried at 105 6
5.9 Chemical Glassware: 3°Cforatleast24h,dissolvedin1000gofdistilledwater.The
5.9.1 Borosilicate Glass Flask, nominally 1000-mL size, solution shall be stored in a borosilicate glass stoppered bottle.
with ground glass stopper. Thespecificconductanceofthis0.0100DemalKClsolutionis
D4350−16 (2022)
−1 −1 −1 −1
0.0007736 ohm ,cm at 0°C, 0.0012205 ohm ,cm at 12.3 Grease the flask stopper with silicone grease and
−1 −1 4
18°C, and 0.0014087 ohm ,cm at 25°C. Obtain the value stopper flasks tightly. Agitate the flasks until the specimen
k from Fig. 1. particles are thoroughly wetted.
6.3 Grease,silicone,notsolubleinwaternorcontainingany 12.4 Place the stoppered flasks in an oven at 71 6 3°C for
water-soluble constituents. In the control specimens, water a total of 288 h (12 days). At the end of the first day of oven
exposed to the grease on the stopper shall have a specific storage, examine the flasks to determine that no stoppers have
−6 −1 −1
conductance less than 7×10 , ohm ,cm . become loose or blown off, with consequent loss of liquid (in
which event the specimen shall be discarded). Agitate the
7. Safety Hazards flasksinordertobreakuplargeaggregatesofthetestspecimen
andtodislodgeairbubblesthattendtofloatparticlesofthetest
7.1 Some plastics and fillers are known to contain toxic
specimen, thus preventing proper wetting.
components and special precautions are required in handling.
Diligentlyfollowthemanufacturer’sprecautionaryinstructions 12.5 At the end of 288 6 2 h, remove the stoppered flasks
and sound laboratory safety practices. from the oven and allow them to cool to 23 6 2°C. Again
agitate the flasks thoroughly and allow the solids to settle.
8. Sampling
12.6 Determine the cell constant of th
...