ASTM D5423-22

Standard Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation

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 20 °C above the ambient temperature to 500 °C, and used for thermal endurance evaluation of electrical insulating materials.  
1.2 The specification requirements for Type I ovens are based on IEC Publication 60216-4-1, and are technically identical to it. The requirements for Type II ovens are essentially identical to the requirements of Specification D2436. This specification and an associated test method, D5374, have replaced Specification D2436.  
1.3 While the ovens covered by this specification are intended primarily for thermal endurance evaluation, their characteristics make them suitable for other applications as applicable.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 30-Apr-2022
• ICS: 71.040.10 - Chemical laboratories. Laboratory equipment
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.17 - Fire and Thermal Properties

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 − 22
Standard Specification for
Forced-Convection Laboratory Ovens for Evaluation of
1
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. Referenced Documents
2
1.1 This specification covers forced-convection ventilated 2.1 ASTM Standards:
electrically-heated ovens, operating over all or part of the D2436 Specification for Forced-Convection Laboratory Ov-
3
temperature range from 20 °C above the ambient temperature ens for Electrical Insulation (Withdrawn 1994)
to 500 °C, and used for thermal endurance evaluation of D5374 Test Methods for Forced-Convection Laboratory Ov-
electrical insulating materials. ens for Evaluation of Electrical Insulation
2.2 Other Document:
1.2 The specification requirements for Type I ovens are
IEC Publication 60216-4-1 Electrical Insulating Materials—
based on IEC Publication 60216-4-1, and are technically
Thermal Endurance Properties—Part 4-1: Ageing
identical to it. The requirements for Type II ovens are essen-
4
Ovens—Single-Chamber Ovens
tially identical to the requirements of Specification D2436.
This specification and an associated test method, D5374, have
3. Terminology
replaced Specification D2436.
3.1 Definitions of Terms Specific to This Standard:
1.3 While the ovens covered by this specification are
3.1.1 rate of ventilation, n—the number of air changes per
intended primarily for thermal endurance evaluation, their
hour in the oven chamber.
characteristics make them suitable for other applications as
3.1.2 set temperature, n—the average of all of the measured
applicable.
temperatures within the oven, averaged over the period of any
1.4 The values stated in SI units are to be regarded as
cyclic temperature variation that occurs.
standard. No other units of measurement are included in this
3.1.2.1 Discussion—This is the actual operating temperature
standard.
of the oven. In IEC 60216-4-1, this term is called the exposure
1.5 This standard does not purport to address all of the temperature.
safety concerns, if any, associated with its use. It is the
3.1.3 temperature fluctuation, n—maximum change in tem-
responsibility of the user of this standard to establish appro-
perature at one point in the oven over a period of time.
priate safety, health, and environmental practices and deter-
3.1.3.1 Discussion—This property depends upon the sensi-
mine the applicability of regulatory limitations prior to use.
tivity and type (on/off or proportional) of control used and the
1.6 This international standard was developed in accor-
heater mass in relation to surface area.
dance with internationally recognized principles on standard-
3.1.4 temperature gradient, n—the maximum temperature
ization established in the Decision on Principles for the
difference at one time between any two points in the oven
Development of International Standards, Guides and Recom-
chamber.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
1
This specification is under the jurisdiction of ASTM Committee D09 on Standards volume information, refer to the standard’s Document Summary page on
Electrical and Electronic Insulating Materials and is the direct responsibility of the ASTM website.
3
Subcommittee D09.17 on Fire and Thermal Properties. The last approved version of this historical standard is referenced on www.ast-
Current edition approved May 1, 2022. Published May 2022. Originally m.org.
4
approved in 1993. Last previous edition approved in 2014 as D5423 – 14. DOI: Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/D5423-22. 4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D5423 − 22
3.1.4.1 Discussion—This property depends on such factors 6.4 Thermal Lag Time—The thermal lag time, measured
as uniformity of heater temperature, heater distribution about with the oven operating at a temperature of 200 °C 6 5 °C,
the oven, and air flow patterns within the oven. In IEC shall not exceed 660 s.
60216-4-1, this term is called the temperature difference.
7. Construction Requirements
3.1.5 temperature variation, n—maximum change in tem-
7.1 The oven shall be soundly constructed of suitable
perature with time and locat
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D5423 − 14 D5423 − 22
Standard Specification for
Forced-Convection Laboratory Ovens for Evaluation of
1
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
1.1 This specification covers forced-convection ventilated electrically-heated ovens, operating over all or part of the temperature
range from 20°C20 °C above the ambient temperature to 500°C,500 °C, and used for thermal endurance evaluation of electrical
insulating materials.
1.2 The specification requirements for Type I ovens are based on IEC Publication 216-4-1,60216-4-1, and are technically identical
to it. The requirements for Type II ovens are essentially identical to the requirements of Specification D2436. This specification
and an associated test method, D5374, have replaced Specification D2436.
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. applications as applicable.
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.The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard.
1.5 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
3
D2436 Specification for Forced-Convection Laboratory Ovens for Electrical Insulation (Withdrawn 1994)
D5374 Test Methods for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
1
This specification is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.17 on Fire and Thermal CharacteristicsProperties.
Current edition approved April 1, 2014May 1, 2022. Published May 2014May 2022. Originally approved in 1993. Last previous edition approved in 20052014 as
D5423 – 93 (2004)D5423 – 14., which was withdrawn in January 2014 and reinstated in April 2014. (1999). DOI: 10.1520/D5423-14. DOI: 10.1520/D5423-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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.
3
The last approved version of this historical standard is referenced on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D5423 − 22
2.2 Other Document:
IEC Publication 216-4-160216-4-1 Guide for the Determination of Thermal Endurance Properties of Electrical Insulating
Materials, Part 4—Aging Ovens, SectionElectrical Insulating Materials—Thermal Endurance Properties—Part 4-1: Ageing
4
1—Single-ChamberOvens—Single-Chamber Ovens
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 rate of ventilation, n—the number of air changes per hour in the oven chamber.
3.1.2 set temperature, n—the average of all of the measured temperatures within the oven, averaged over the period of any cyclic
temperature variation that may occur.occurs.
3.1.2.1 Discussion—
This is the actual operating temperature of the oven. In IEC 60216-4-1, this term is called the exposure temperature.
3.1.3 temperature fluctuation, n—temperature differences maximum change in temperature at one point in the oven over a period
of
...