ASTM D5642-99
(Test Method)Standard Test Method for Sealed Tube Chemical Compatibility Test
Standard Test Method for Sealed Tube Chemical Compatibility Test
SCOPE
1.1 This test method covers procedures for evaluating the interaction of electrical insulation components used, or intended to be used, in electrical insulation systems.
1.2 This test method is useful for determining compatibility but additional testing may be required depending upon application.
1.3 This test method may also provide useful information about the behavior of selected insulating materials when compared to a reference value as opposed to a reference system.
1.4 This test method does not cover systems which operate in liquids or gases other than air.
1.5 The values stated in SI units are the standard in this test method.
1.6 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. See also Notes 3, 4 and 8.3.2.1.
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An American National Standard
Designation:D5642–99
Standard Test Method for
Sealed Tube Chemical Compatibility Test
This standard is issued under the fixed designation D 5642; 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 3.2.1 aging test, n—a process of exposure, to a specified set
of conditions for a defined period of time, which results in an
1.1 This test method covers procedures for evaluating the
irreversible change in one or more physical, chemical, electri-
interaction of electrical insulation components used, or in-
cal, or thermal characteristics of a material.
tended to be used, in electrical insulation systems.
3.2.2 candidate system, n—the proposed electrical insula-
1.2 This test method is useful for determining compatibility
tion system to be evaluated.
but additional testing may be required depending upon appli-
3.2.3 electrical insulation system, n—an intimate combina-
cation.
tion of insulating materials with conductors, as used in elec-
1.3 This test method may also provide useful information
trical equipment.
about the behavior of selected insulating materials when
3.2.4 insulation system class, n—a standardized designation
compared to a reference value as opposed to a reference
of the temperature capability of the electrical insulation sys-
system.
tem. It is expressed by both numbers and letters as follows:
1.4 This test method does not cover systems which operate
System Class
in liquids or gases other than air.
105 (A)
1.5 The values stated in SI units are the standard in this test
120 (E)
method. 130 (B)
155 (F)
1.6 This standard does not purport to address all of the
180 (H)
safety concerns, if any, associated with its use. It is the
200 (N)
responsibility of the user of this standard to establish appro-
220 (R)
240 (S)
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. See also Note 3,
3.2.5 reference system, n—an electrical insulation system
Note 4 and 8.3.2.1
which has been previously evaluated and found acceptable.
3.2.6 twisted pair, n—film-insulated round magnet wire that
2. Referenced Documents
has been prepared in accordance with Test Methods D 1676.
2.1 ASTM Standards:
4. Summary of Test Method
D 149 Test Method for Dielectric Breakdown Voltage and
Dielectric Strength of Electrical Insulating Materials at
4.1 Acombinationofspecificmaterialsissealedinalimited
Commercial Power Frequencies
space and subjected to a specific elevated temperature for a
D 1676 Test Methods for Film-Insulated Magnet Wire
specified time. Following this exposure the dielectric break-
D 1711 Terminology Relating to Electrical Insulation
down voltage of the insulated conductors is used as a basis for
judging the compatibility of the candidate system.
3. Terminology
5. Significance and Use
3.1 Definitions:
3.1.1 magnet wire—See Terminology D 1711 for the defi-
5.1 This test method is useful for evaluating a combination
nition of this term.
of materials for potential use in an electrical insulation system.
3.2 Definitions of Terms Specific to This Standard:
6. Apparatus
6.1 Oven, capable of maintaining the required exposure
This test method is under the jurisdiction of ASTM Committee D-9 on
temperature within 63°C.
Electrical and Electronic Insulating Materials and is the direct responsibility of
6.2 Glass Tubes with inside volume not exceeding 900 mL
Subcommittee D09.17 on Thermal Characteristics.
Current edition approved March 10, 1999. Published May 1999. Originally
that can be sealed. Two general types are described as follows:
published as D 5642 – 94. Last previous edition D 5642 – 97.
Annual Book of ASTM Standards, Vol 10.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D5642
6.2.1 Flanged High Temperature Glass Tubes which are 8.1.6 Seal tubes within 1 min after conditioning, and leak
designed to be sealed with metal rings and gaskets are test immediately thereafter in accordance with 8.1.6.2.
preferred.
8.1.6.1 Seal flanged glass tubes by applying a sufficient
6.2.2 Glass Tubes, which can be fusion sealed after the torque to ensure a seal that is leak free.Atorque of 3.4 N·m (30
addition of all materials are acceptable alternatives.
inch-pounds) in increments of 0.56 N·m (5 inch-pounds),
6.3 Gasket Materials for use with tubes described in 6.2.1. alternating between bolts to tighten evenly and securely has
6.3.1 Type TFE (Tetrafluoroethylene) or FEP (Perfluoroet- been found acceptable for this purpose.
hylene Propylene) Fluorocarbon. 8.1.6.2 Check glass tubes for leaks using the following
6.3.2 Hexafluoropropylene—vinylidene fluoride elastomer
procedure: Submerge the still warm tubes into room tempera-
can be used for exposure temperatures not exceeding 155°C. ture tap water for a minimum of 2 min. Observe the tubes after
6.4 Apparatus in conformance with Test Method D 149 to
they have reached room temperature for condensation on the
measure dielectric breakdown voltage. inner walls. Condensation is a result of leakage.
8.1.6.3 Do not use tubes that exhibit leakage.
7. Material Specimens
8.2 Aging:
7.1 The specific list of materials to be tested is to be
8.2.1 Place the tubes into an oven that is at room tempera-
established by agreement between interested parties.
ture.
7.2 Represent each of the non-metallic components of the
8.2.2 Apply power to the oven and allow it to attain the
electrical insulation system, with the exception of an impreg-
aging temperature.
nating varnish and insulated conductors, with a specimen
8.2.2.1 Sealed tubes may be placed into a heated oven, but
having a minimum mass of 250 mg.
it should be recognized that the thermal shock will cause
7.3 Insulated Conductor Specimens:
stresses that may result in cracking of the glass tubes. Do not
7.3.1 Use film insulated magnet wire twisted pairs con-
use any tubes that crack as a result of such treatment.
structed in accordance with Test Method D 1676; 18 AWG
8.2.3 The aging temperature shall be 25°C greater than the
heavy build is preferred.
numerical insulation system class of the reference system.
7.3.2 For conductors not suitable for constructing twisted
8.2.4 After a minimum of 336 h exposure to the aging
pairs, use specimens having a minimum length of 200 mm.
temperature,removethetubesfromtheoven.Asanalternative,
to reduce the ext
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