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ASTM D1870-91

(Practice)

Practice for Elevated Temperature Aging Using a Tubular Oven (Withdrawn 1998)

Practice for Elevated Temperature Aging Using a Tubular Oven (Withdrawn 1998)

General Information

Status
Withdrawn
Withdrawal Date
09-Mar-1998
ICS
83.060 - Rubber
Technical Committee
D20 - Plastics
Drafting Committee
D20.50 - Durability of Plastics
Current Stage
Ref Project

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ASTM D1870-91 - Practice for Elevated Temperature Aging Using a Tubular Oven (Withdrawn 1998)ASTM D1870-91 - Practice for Elevated Temperature Aging Using a Tubular Oven (Withdrawn 1998)
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ASTM D1870-91 - Practice for Elevated Temperature Aging Using a Tubular Oven (Withdrawn 1998)
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Standards Content (Sample)

ASTM D1870 91 - 0759530 0073926 I, M
AMERICAN SOCIETY FOR TESTlNGANO MATERIALS
Designation: D 1870 - 91
1916 Race St. Philadelphia, Pa 10103
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
If not listed in the current combined index, will appear In the neti edition.
Standard Practice for
Elevated Temperature Aging Using
a Tubular Oven’
This standard is issued under the fixed designation D 1870; 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 (6) indicates an editorial change since the last revision or reapprovat.
This standard has been approved for use by agencies of the Department of Defense. Consult the DOD Index of Specijicarions and
Standards for de specijc year of issue which has been adopled by the Department of Defense.
1. Scope 5. Significance and Use
1.1 This practice2 covers a procedure for estimating the 5.1 Any correlation between this practice and natural life
of these materials must be determined for the particular
relative resistance of polymeric compounds to elevated
temperature aging under controlled conditions of air circula- application in which the mater&s are to be used.
tion and freedom from contamination.
6. Apparatus
1.2 The values stated in SI units are to be regarded as the
standard. The values in parentheses are for information only.
6.1 Forced Circulating-Air Oven, provided with tubes and
1.3 This standard does not purport to address the safety
a means for calibrating and controlling air velocity within
problems associated with its use. It is the responsibility of the
the tubes. The air velocity variation shall not exceed 10 % of
user of this standard to establish appropriate safety and
the specified velocity. The temperature within the testing
health practices and determine the applicability of regulatory
chamber shall be uniform within the tolerances given in
limitations prior to use.
Table 1 of Specification E 145 for Type II, Grade A ovens.
The heating medium for the aging chamber shall be pre-
2. Referenced Documents
heated air, circulated within it at atmospheric pressure. The
heated air in both the chamber and in the tubes shall be
2.1 ASTM Standards:
thoroughly circulated by means of mechanical agitation. The
D 6 18 Practice for Conditioning Plastics and Electrical
design of the oven shall be such that heated fresh air enters
Insulating Materials for Testing3
one end of the tube and is exhausted from the system
D 883 Definition of Terms Relating to Plastics3
without being recirculated, eliminating the use of contami-
D 1600 Terminology Relating to Abbreviations, Acro-
nated air and cross migration of volatile constituents con-
nyms, and Codes for Terms Relating to Plastics3
tained in the specimens being tested. An apparatus meeting
E 145 Specification for Gravity-Convectioti and Forced-
these requirements is described in Appendix X 1.
Ventilation Ovens4
6.2 Recording Temperature-Indicating Device, to measure
the temperature near the center of the chamber.
3. Terminology
6.3 Velometer,5 or checking the air velocity.
3.1 General-Definitions are in accordance with Defini-
6.4 Specimen Holders-SuitabIe specimen holders shall
tions D 883 and abbreviations are in accordance with
be provided, which will position the specimens within the
Terminology D 1600, unless otherwise indicated.
tubes, separated from each other and the tube walls, and
permit free flow of air around the specimens.
4. Summary of Practice
7. Sampling
4.1 This practice consists of subjecting test specimens
having previously determined properties to controlled dete-
7.1 Sampling shall be in accordance with the ASTM test
riorating influences for known periods, after which the
methods for the specific properties to be determined.
physical properties are again measured and the changes
noted. In this practice, the test involves exposure of speci-
8. Preparation and Calibration of Apparatus
mens to a carefully controlled flow of air at an elevated
8.1 Adjust the air within the tubes to the required test
temperature and at atmospheric pressure.
temperature within the range of 50 to 150°C.
8.2 Adjust the air flow in each tube to the required
velocity.
1 This practice is under the jurisdiction of ASTM Committee D-20 on Plastics
and is the direct responsibility of Subcommittee D20.50 on Permanence Proper-
NOTE-velocities of 100 to 250 m/min have been used.
ties.
Current edition approved March 15, 1991. Published May 1991. Originally
9. Conditioning
published as D 1870 - 61 T. Last previous edition D 1870 - 68 (1983)“.
2For further information on this practice the following reference may be
9.1 Conditioning-Condition the test specimens at 23 f
consulted: Markus Royen, “A Study of the Accelerated Aging of Vinyl Plastic
2°C (73.4 & 3.6”F)
...

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FIG. 1 Dimensional Requirements Between Specimen Clamp and Striking Edge (Type A)
FIG. 2 Typical Clamp (Type A)
FIG. 3 Dimensional Details of Striking Edge and Clamping Device, Type B (Positioning of Unnotched Test Specimen)
Note 1: Dimensions are in millimetres.
FIG. 4 Assembled Clamp with Test Specimens, Type B
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Standard Test Method for Determination of Residual Acrylonitrile Monomer in Styrene-Acrylonitrile Copolymer Resins and Nitrile-Butadiene Rubber by Headspace-Capillary Gas Chromatography (HS-CGC)

SIGNIFICANCE AND USE
A measurement of the residual acrylonitrile in nitrile rubbers (NBR), styrene-acrylonitrile copolymers or ABS terpolymers will determine the polymer's suitability for various applications.
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Standard Test Method for Brittleness Temperature of Plastics and Elastomers by Impact

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This test method establishes the temperature at which 50 % of the specimens tested fail when subjected to the conditions specified herein. The test provides for the evaluation of long-time effects such as crystallization, or those effects that are introduced by low-temperature incompatibility of plasticizers in the material under test. Plastics and elastomers are used in many applications requiring low-temperature flexing with or without impact. Use data obtained by this method to predict the behavior of plastic and elastomeric materials at low temperatures only in applications in which the conditions of deformation are similar to those specified in this test method. This test method has been found useful for specification purposes, but does not necessarily measure the lowest temperature at which the material is suitable for use.
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FIG. 2 Typical Clamp (Type A)
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1.1 This test method covers the determination of the temperature at which plastics and elastomers exhibit brittle failure under specified impact conditions. Two routine inspection and acceptance procedures are also provided.
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