ASTM D5423-93(2005)

Standard Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation (Withdrawn 2014)

ABSTRACT
This specification covers forced-convection ventilated electrically-heated ovens and used for thermal endurance evaluation of electrical insulating materials. The ovens shall be classified according to ventilations: Type I and Type II. Rate of ventilation, set temperature, temperature variation, and thermal log time properties shall be determined using specified test methods.
SCOPE
1.1 This specification covers forced-convection ventilated electrically-heated ovens, operating over all or part of the temperature range from 20C above the ambient temperature to 500C, and used for thermal endurance evaluation of electrical insulating materials.
1.2 The specification requirements for Type I ovens are based on IEC Publication 216-4-1, and are technically identical to it. The requirements for Type II ovens are essentially identical to the requirements of Specification D 2436. This specification and an associated test method, D5374, have replaced Specification D 2436.
1.3 While the ovens covered by this specification are intended primarily for thermal endurance evaluation, they can also be used wherever their characteristics make them suitable for other applications.
1.4 This specification does not address safety aspects. If it is anticipated that oven contents or the location in which the oven is to be installed may create a hazard, the purchaser should determine and specify what additional requirements are needed.
WITHDRAWN RATIONALE
This specification covers forced-convection ventilated electrically-heated ovens, operating over all or part of the temperature range from 20°C above the ambient temperature to 500°C, and used for thermal endurance evaluation of electrical insulating materials.
Formerly under the jurisdiction of Committee D09 on Electrical and Electronic Insulating Materials, this practice was withdrawn in January 2014 in accordance with section 10.6.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Historical
• Publication Date: 31-Aug-2005
• Withdrawal Date: 15-Jan-2014
• ICS: 71.040.10 - Chemical laboratories. Laboratory equipment
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.17 - Fire and Thermal Properties

Relations

• Replaces: ASTM D5423-93(1999) - Standard Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
• Effective Date: 01-Sep-2005
• Referred By: ASTM D2307-21 - Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
• Effective Date: 01-Sep-2005
• Referred By: ASTM D1676-17 - Standard Test Methods for Film-Insulated Magnet Wire
• Effective Date: 01-Sep-2005
• Referred By: ASTM D6053-14(2018) - Standard Test Method for Determination of Volatile Organic Compound (VOC) Content of Electrical Insulating Varnishes
• Effective Date: 01-Sep-2005
• Referred By: ASTM D3312-18 - Standard Test Method for Percent Reactive Monomer in Solventless Varnishes
• Effective Date: 01-Sep-2005
• Referred By: ASTM D3045-18 - Standard Practice for Heat Aging of Plastics Without Load
• Effective Date: 01-Sep-2005
• Referred By: ASTM D1830-17 - Standard Test Method for Thermal Endurance of Flexible Sheet Materials Used for Electrical Insulation by the Curved Electrode Method
• Effective Date: 01-Sep-2005
• Referred By: ASTM D2756-07(2017) - Standard Test Method for Weight Loss of Electrical Insulating Varnishes
• Effective Date: 01-Sep-2005
• Referred By: ASTM D3145-20 - Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by Helical Coil Method
• Effective Date: 01-Sep-2005
• Referred By: ASTM D2304-23 - Standard Test Method for Thermal Endurance of Rigid Electrical Insulating Materials
• Effective Date: 01-Sep-2005
• Referred By: ASTM D7894/D7894M-19 - Standard Test Method for Thermal Endurance of Coating Powders Used for Integral Bus Bar Insulation Systems
• Effective Date: 01-Sep-2005
• Referred By: ASTM D7895/D7895M-19 - Standard Test Method for Thermal Endurance of Coating Powders Used for Powder Coating Insulation Systems
• Effective Date: 01-Sep-2005
• Referred By: ASTM D4568-13(2020) - Standard Test Methods for Evaluating Compatibility Between Cable Filling and Flooding Compounds and Polyolefin Wire and Cable Materials
• Effective Date: 01-Sep-2005
• Referred By: ASTM D149-20 - Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
• Effective Date: 01-Sep-2005
• Referred By: ASTM D350-21 - Standard Test Methods for Flexible Treated Sleeving Used for Electrical Insulation
• Effective Date: 01-Sep-2005

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:D5423 −93(Reapproved 2005) An American National Standard
Standard Specification for
Forced-Convection Laboratory Ovens for Evaluation of
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 Materials, Part 4—Aging Ovens, Section
1—Single-Chamber Ovens
1.1 This specification covers forced-convection ventilated
electrically-heated ovens, operating over all or part of the
3. Terminology
temperaturerangefrom20°Cabovetheambienttemperatureto
3.1 Definitions of Terms Specific to This Standard:
500°C, and used for thermal endurance evaluation of electrical
insulating materials. 3.1.1 rate of ventilation, n—the number of air changes per
hour in the oven chamber.
1.2 The specification requirements for Type I ovens are
3.1.2 set temperature, n—the average of all of the measured
basedonIECPublication216-4-1,andaretechnicallyidentical
temperatures within the oven, averaged over the period of any
to it. The requirements for Type II ovens are essentially
cyclic temperature variation that may occur.
identical to the requirements of Specification D2436. This
3.1.2.1 Discussion—Thisistheactualoperatingtemperature
specification and an associated test method, D5374, have
of the oven.
replaced Specification D2436.
3.1.3 temperature fluctuation, n—temperature differences at
1.3 While the ovens covered by this specification are
one point in the oven over a period of time.
intended primarily for thermal endurance evaluation, they can
3.1.3.1 Discussion—This property depends upon the sensi-
also be used wherever their characteristics make them suitable
tivity and type (on/off or proportional) of control used and the
for other applications.
heater mass in relation to surface area.
1.4 This specification does not address safety aspects. If it is
3.1.4 temperature gradient, n—the maximum temperature
anticipated that oven contents or the location in which the oven
difference at one time between different points in the oven
is to be installed may create a hazard, the purchaser should
chamber.
determine and specify what additional requirements are
3.1.4.1 Discussion—This property depends on such factors
needed.
as uniformity of heater temperature, heater distribution about
2. Referenced Documents
the oven, and air flow patterns within the oven.
2.1 ASTM Standards: 3.1.5 temperature variation, n—temperature differences
D2436 Specification for Forced-Convection Laboratory Ov-
with time and location due to the combination of temperature
ens for Electrical Insulation (Withdrawn 1994) gradient and temperature fluctuation.
D5374 Test Methods for Forced-Convection Laboratory Ov-
3.1.6 thermal lag time, n—the time required for a defined
ens for Evaluation of Electrical Insulation
specimen to reach a specified temperature (or range of tem-
2.2 Other Document:
perature).
IEC Publication 216-4-1 Guide for the Determination of
3.1.6.1 Discussion—This property is largely dependent
Thermal Endurance Properties of Electrical Insulating
upontherateofaircirculationwithintheoven.InIEC216-4-1,
this term is called“ time constant.”
This specification is under the jurisdiction of ASTM Committee D09 on
3.1.7 time constant, n—See thermal lag time.
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.17 on Thermal Characteristics.
Current edition approved Sept. 1, 2005. Published October 2005. Originally
4. Classification
approved in 1993. Last previous edition approved in 1999 as D5423 – 93 (1999).
4.1 Type I—Ovens with rate of ventilation of 5 to 20 air
DOI: 10.1520/D5423-93R05.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
changes per hour.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
The last approved version of this historical standard is referenced on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
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D5423−93 (2005)
4.2 Type II—Ovens with rate of ventilation of 100 to 200 air 7.2 The interior of the oven shall be constructed of suitable
changes per hour. corrosion-resistant, non-absorbent material, so fabricated that
any joints are leak-proof and not subject to corrosion, and so
5. Test Methods
that the interior surfaces shall be easy to clean.
5.1 Determine the properties specified in Section 6 using
7.3 Thedoor(s)shallbefittedwithhingesandlatcheswhich
Test Methods D5374.
will provide sufficient pressure for an effective seal between
the interior of the oven and the external atmosphere, using a
6. Performance Requirements
gasket, if necessary.
6.1 Rate of Ventilation—Therateofventilationat100°Cand
7.4 The oven shall have provisions for automatically
at the maximum temperature at which the oven may be used
switching off the heaters when the actual oven temperature
shall be:
substantially exceeds the set temperature.
6.1.1 For Type I ovens, 5 to 20 air changes per hour,
7.5 Ports for admitting and exhausting air shall be provided,
6.1.2 For Type II ovens, 100 to 200 air changes per hour.
with fittings for attaching conduits for exhaust air. When
NOTE 1—Past experience in the United States has been to specify 100
specified, provisions shall be made for supplying inlet air or
to 200 air changes per hour, as required for Type II ovens. However,
other gases from a controlled source.
international practice, as defined in IEC Publication 216-4-1, has been to
use the lower rate of ventilation, which is specified for Type I ovens.
7.6 Dampers for adjusting the rate of ventilation and the air
circulation shall be provided to enable compliance with other
6.2 Set T
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