ASTM D5423-14

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Designation:D5423 −14
Standard Specification for
Forced-Convection Laboratory Ovens for Evaluation of
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Electrical Insulation
This standard is issued under the fixed designation D5423; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.2 Other Document:
IEC Publication 216-4-1 Guide for the Determination of
1.1 This specification covers forced-convection ventilated
Thermal Endurance Properties of Electrical Insulating
electrically-heated ovens, operating over all or part of the
Materials, Part 4—Aging Ovens, Section
temperaturerangefrom20°Cabovetheambienttemperatureto
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1—Single-Chamber Ovens
500°C, and used for thermal endurance evaluation of electrical
insulating materials.
3. Terminology
1.2 The specification requirements for Type I ovens are
3.1 Definitions of Terms Specific to This Standard:
basedonIECPublication216-4-1,andaretechnicallyidentical
3.1.1 rate of ventilation, n—the number of air changes per
to it. The requirements for Type II ovens are essentially
hour in the oven chamber.
identical to the requirements of Specification D2436. This
specification and an associated test method, D5374, have 3.1.2 set temperature, n—the average of all of the measured
temperatures within the oven, averaged over the period of any
replaced Specification D2436.
cyclic temperature variation that may occur.
1.3 While the ovens covered by this specification are
3.1.2.1 Discussion—Thisistheactualoperatingtemperature
intended primarily for thermal endurance evaluation, they can
of the oven.
also be used wherever their characteristics make them suitable
3.1.3 temperature fluctuation, n—temperature differences at
for other applications.
one point in the oven over a period of time.
1.4 This standard does not purport to address all of the
3.1.3.1 Discussion—This property depends upon the sensi-
safety concerns, if any, associated with its use. It is the
tivity and type (on/off or proportional) of control used and the
responsibility of the user of this standard to establish appro-
heater mass in relation to surface area.
priate safety and health practices and determine the applica-
3.1.4 temperature gradient, n—the maximum temperature
bility of regulatory limitations prior to use.
difference at one time between different points in the oven
chamber.
2. Referenced Documents
3.1.4.1 Discussion—This property depends on such factors
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2.1 ASTM Standards:
as uniformity of heater temperature, heater distribution about
D2436 Specification for Forced-Convection Laboratory Ov-
the oven, and air flow patterns within the oven.
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ens for Electrical Insulation (Withdrawn 1994)
3.1.5 temperature variation, n—temperature differences
D5374 Test Methods for Forced-Convection Laboratory Ov-
with time and location due to the combination of temperature
ens for Evaluation of Electrical Insulation
gradient and temperature fluctuation.
3.1.6 thermal lag time, n—the time required for a defined
1 specimen to reach a specified temperature (or range of tem-
This specification is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of
perature).
Subcommittee D09.17 on Thermal Characteristics.
3.1.6.1 Discussion—This property is largely dependent
Current edition approved April 1, 2014. Published May 2014. Originally
upontherateofaircirculationwithintheoven.InIEC216-4-1,
approved in 1993. Last previous edition approved in 2005 as D5423 – 93 (2004),
which was withdrawn in January 2014 and reinstated in April 2014. (1999). DOI: this term is called“ time constant.”
10.1520/D5423-14.
3.1.7 time constant, n—See thermal lag time.
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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D5423−14
4. Classification 7.2 The interior of the oven shall be constructed of suitable
corrosion-resistant, non-absorbent material, and fabricated so
4.1 Type I—Ovens with rate of ventilation of 5 to 20 air
any joints are leak-proof and not subject to corrosion, and
changes per hour.
having interior surfaces that are easy to clean.
4.2 Type II—Ovens wi
...