ASTM D2151-95
(Practice)Standard Practice for Staining of Poly(Vinyl Chloride) Compositions by Rubber Compounding Ingredients
Standard Practice for Staining of Poly(Vinyl Chloride) Compositions by Rubber Compounding Ingredients
SCOPE
1.1 This practice measures the tendency for staining of a poly(vinyl chloride) composition to occur due to migration into the plastic of a staining antioxidant (or other compounding additive) from rubber with which it is in intimate contact.
1.2 This practice may be used to determine relative staining resistance of vinyl compounds by testing them against a single standard rubber composition (Note 1). It may also be used to compare relative staining tendencies of two or more rubber compositions by testing them against a single standard poly(vinyl chloride) composition.
1.3 The values stated in SI units are to be regarded as the standard.
Note 1--The preparation of suggested standard compositions is described in the Appendix X1. This procedure may also be applicable to determine stain resistance of plastic materials other than poly(vinyl chloride) in contact with rubber.
Note 2--There is no similar or equivalent ISO standard.
1.4 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.
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Designation: D 2151 – 95 An American National Standard
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 Practice for
Staining of Poly(Vinyl Chloride) Compositions by Rubber
Compounding Ingredients
This standard is issued under the fixed designation D 2151; 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 (Styrene-Butadiene Rubber) Mixed with Carbon Black or
Carbon Black and Oil
1.1 This practice measures the tendency for staining of a
G 23 Practice for Operating Light-Exposure Apparatus
poly(vinyl chloride) composition to occur due to migration into
(Carbon-Arc Type) With and Without Water for Exposure
the plastic of a staining antioxidant (or other compounding
of Nonmetallic Materials
additive) from rubber with which it is in intimate contact.
1.2 This practice may be used to determine relative staining
3. Significance and Use
resistance of vinyl compounds by testing them against a single
3.1 Compounding ingredients used in the manufacture of
standard rubber composition (Note 1). It may also be used to
rubber can migrate into some vinyl compositions in contact
compare relative staining tendencies of two or more rubber
with the rubber. These materials can then cause staining of the
compositions by testing them against a single standard poly-
vinyl either immediately, or under the action of ultraviolet
(vinyl chloride) composition.
light. This latter behavior is especially likely when certain
1.3 The values stated in SI units are to be regarded as the
antioxidants migrate into the vinyl. Although they may be
standard.
relatively colorless in their pure state, the action of light can
NOTE 1—The preparation of suggested standard compositions is de-
transform these antioxidants into chromophoric agents.
scribed in the Appendix X1. This procedure may also be applicable to
determine stain resistance of plastic materials other than poly(vinyl NOTE 3—Vinyl compositions containing lead, cadmium, mercury, or
chloride) in contact with rubber. antimony compounds may stain when in contact with rubber due to the
NOTE 2—There is no similar or equivalent ISO standard. formation of colored sulfides. This type of stain is due to chemical
interaction between ingredients in the rubber and the vinyl compounds.
1.4 This standard does not purport to address all of the
Sulfide stain tendencies of vinyl compositions can be determined by
safety concerns, if any, associated with its use. It is the
Practice D 1712.
responsibility of the user of this standard to establish appro-
4. Apparatus
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4.1 For Test Specimen Preparation—A mill, a press, and
other auxiliary equipment for the preparation of test specimens.
2. Referenced Documents
4.2 Oven—An oven of the forced-air or convection type,
2.1 ASTM Standards:
having the following characteristics:
D 925 Test Methods for Rubber Property—Staining of Sur-
4.2.1 Control the oven by an accurate thermoregulator,
faces (Contact, Migration and Diffusion)
maintaining set point within 60.5°C (0.9°F) or better.
D 1249 Specification for Octyl Ortho-Phthalate Ester Plas-
4.2.2 Equip the oven with a calibrated ASTM thermometer,
ticizers
and the proper stem correction shall be applied to the tempera-
D 1712 Practice for Resistance of Plastics to Sulfide Stain-
ture measurement.
ing
4.2.3 Maintain the oven at the temperature of test for at least
D 1755 Specification for Poly(Vinyl Chloride) Resins
1 h prior to insertion of the test specimens.
D 1898 Practice for Sampling of Plastics
4.2.4 Determine the uniformity of temperature over the area
D 3186 Test Method for Rubber—Evaluation of SBR
on which the specimens are to be aged by means of thermo-
couple readings prior to the start of the test.
4.3 Weights—Weights (for example, lead shot in a suitable
This practice is under the jurisdiction of ASTM Committee D-20 on Plastics 2
flat-bottom container) to exert a pressure of 10 g/cm on the
and is the direct responsibility of Subcommittee D-20.15 on Thermoplastic
test specimens.
Materials.
Current edition approved March 15, 1995. Published May 1995. Originally 4.4 Light Source—Intense light sources such as those de-
published as D 2151 – 63 T. Last previous edition D 2151 – 89.
scribed in Practice G 23 shall be used.
This edition contains changes in Sections 1 and 10 to include an ISO equivalency
statement and Keywords.
Annual Book of ASTM Standards, Vol 09.01.
3 4
Annual Book of ASTM Standards, Vol 08.01. Annual Book of ASTM Standards, Vol 14.02.
D 2151
5. Sampling 8.2 Place the test ass
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