ASTM D4350-00

Standard Test Method for Corrosivity Index of Plastics and Fillers

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 1--There is no similar or equivalent ISO standard.
1.2 The values stated in SI units are to be regarded as standard.
1.3 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 7.

General Information

• Status: Historical
• Publication Date: 09-Nov-2000
• ICS: 83.040.30 - Auxiliary materials and additives for plastics
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.16 - Thermosetting Materials

Relations

• Replaced By: ASTM D4350-00(2005) - Standard Test Method for Corrosivity Index of Plastics and Fillers
• Effective Date: 01-Nov-2005
• Referred By: ASTM D4850-23 - Standard Terminology Relating to Fabrics and Fabric Test Methods
• Effective Date: 10-Nov-2000
• Referred By: ASTM D5948-05(2020) - Standard Specification for Molding Compounds, Thermosetting
• Effective Date: 10-Nov-2000

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 4350 – 00
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* from the test specimens is measured by using the specified
conductivity cell. The specific conductance is calculated from
1.1 This test method is designed for use in obtaining the
the data and is called the corrosivity index of the material.
specific conductance of a water extract of plastics and fillers.
The magnitude of this conductance may be taken as an index
4. Significance and Use
ofthelikelihoodthat,inahumidatmosphere,metalsurfacesin
4.1 This test method provides a means for comparing the
contact with these materials may become corroded due to
corrosivepotentialofplasticsandfillersinhumidatmospheres.
galvanic action or direct chemical attack; this is called the
4.2 This test method is intended for use in research and
corrosivity index.
evaluation.
NOTE 1—There is no similar or equivalent ISO standard.
5. Apparatus
1.2 The values stated in SI units are to be regarded as
5.1 Conductance Bridge, Wheatstone type, with a range
standard.
from 1 to 250 000-V measured resistance, a built-in potenti-
1.3 This standard does not purport to address all of the
ometer, a 1000 6 50-cycles per second oscillator, and a
safety concerns, if any, associated with its use. It is the
sensitive null point indicator. The bridge shall be capable of
responsibility of the user of this standard to establish appro-
measuring resistance with an accuracy of 62%.
priate safety and health practices and determine the applica-
5.2 Conductivity Cell, dip-type, micro, for solutions of
bility of regulatory limitations prior to use. Specific precau-
medium conductance. The cell should have a cell constant of
tionary statements are given in Section 7.
−1
approximately 1.0 cm . The borosilicate glass shall have a
2. Referenced Documents
maximum outside tube diameter of 12.7 mm, overall length of
2.1 ASTM Standards: 177.8 mm, chamber inside diameter of 9.5 mm, and chamber
D618 Practice for Conditioning Plastics for Testing depth of 50.8 mm.
5.3 Drill, electric, capable of holding a 10.54-mm drill bit,
D1193 Specification for Reagent Water
E1 Specification for ASTM Thermometers and rotating at 500-r/min maximum speed.
5.4 Mill,suchaslaboratoryWileycuttingmillorequivalent.
E11 Specification for Wire-Cloth Sieves for Testing Pur-
poses 5.5 Sieves, standard (alternative) sieve designations 425 µm
(No. 40), and 250 µm (No. 60) in accordance with Specifica-
E145 Specification for Gravity-Convection and Forced-
Ventilation Ovens tion E11.
5.6 Analytical Balance, capable of determining mass to the
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method nearest 1.0 mg.
5.7 Oven, forced-ventilation type, with uniformity of tem-
3. Summary of Test Method
perature within 61% of the differential between oven and
3.1 Specimensofplasticsorfillersareimmersedindistilled ambienttemperature,witharateofventilationof100to200air
water and exposed to specified conditions of temperature and changesperhour,inaccordancewithSpecificationE145,Type
time. The specific resistance of each of the solutions extracted IIA.
5.8 Thermometer, solid-stem, precision,ASTM No. 63C, in
accordance with Specification E1.
ThistestmethodisunderthejurisdictionofASTMCommitteeD20onPlastics
5.9 Chemical Glassware:
and is the direct responsibility of Subcommittee D20.16 on Thermosetting Materi-
5.9.1 Borosilicate Glass Flask, nominally 1000-mL size,
als.
with ground glass stopper.
Current edition approved Nov. 10, 2000. Published January 2001. Originally
published as D4350–84. Last previous edition D4350–95.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM A conductivity cell found suitable for this purpose is a Model No. 3403
Standards volume information, refer to the standard’s Document Summary page on conductivitycell,availablefromYellowSpringsInstrumentCo.,Inc.,P.O.Box279,
the ASTM website. Yellow Springs, OH 45387.
*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
FIG. 1 Specific Conductance of 0.0100 Demal KCl
−1 −1 4
5.9.2 Borosilicate Glass Erlenmeyer Flask, 65-mL actual 18°C, and 0.0014087 ohm ,cm at 25°C. This specific
capacity to bottom of stopper (nominally 50-mL size), with conductance versus temperature is plotted in Fig. 1.
ground glass stopper No. 19. 6.3 Grease,silicone,notsolubleinwaternorcontainingany
water-soluble constituents. In the control specimens, water
5.9.3 Pipet, volumetric, 50-mL capacity, calibrated “to de-
exposed to the grease on the stopper shall have a specific
liver.”
−6 −1 −1
conductance less than 7 310 , ohm ,cm .
6. Reagents and Materials
7. Safety Hazards
6.1 Distilled Water, Type III, reagent water as defined in
7.1 Some plastics and fillers are known to contain toxic
Specification D1193.When stored in borosilicate glass bottles
components and special precautions are required in handling.
at 23 6 2°C, the water shall have a calculated specific
Themanufacturer’sprecautionaryinstructionsandsoundlabo-
−6 −1 −1
conductance of less than 2.0 310 , ohm ,cm .
ratory safety practices should be diligently followed.
6.2 Potassium Chloride Solution, consisting of 0.7453 g of
reagent grade potassium chloride, previously dried at 105 6
3°Cforatleast24h,dissolvedin1000gofdistilledwater.The
SpecificconductancevaluesarebasedontheworkofJones,G.,andBradshaw,
solution shall be stored in a borosilicate glass stoppered bottle.
B. C., J. Amer. Chem. Soc., 55 (1933) 1780. For more detailed information on the
Thespecificconductanceofthis0.0100DemalKClsolutionis
use of Demal KCl, see“ Electrolyte Solutions,” by Robinson, R.A., and Stokes, R.
−1 −1 −1 −1
0.0007736 ohm ,cm at 0°C, 0.0012205 ohm ,cm at H., Academic Press, Inc., New York, 1955, pp. 94–96.
D4350–00
8. Sampling 12.6.4 Measure the specific resistance in ohms of each of
the solutions with a conductance bridge at 1000 6 50 cycles
8.1 Because of the diverse nature of plastics and fillers, and
per second.
the various forms and packages commercially available, no
12.7 Determine the specific resistance of the specimens and
standard methods of sampling have been established. An
controls. Use the same technique and the same conductivity
adequateamountofmaterial,representativeofeachingredient,
cell used in 12.6.3 and 12.6.4. Measurements shall be made at
shall be selected from each lot to permit preparation of
the same temperature determined in 12.6.2. Measurements
specimens as agreed upon between the buyer and the seller.
shall be made within 4 h after removal from oven.
9. Specimen Preparation
13. Calculation
9.1 Plastics, either prepared according to the manufactur-
13.1 Calculate the cell constant. The conductivity cell
er’s directions, or as received from the manufacturer, shall be
constant K is given by K=kR, where k is the specific
drilled with a sharp drill at a
...