ASTM E1652-15

Standard Specification for Magnesium Oxide and Aluminum Oxide Powder and Crushable Insulators Used in the Manufacture of Base Metal Thermocouples, Metal-Sheathed Platinum Resistance Thermometers, and Noble Metal Thermocouples

ABSTRACT
This specification covers the requirements for magnesium oxide (MgO) and aluminum oxide (Al2O3) powders and crushable insulators used to manufacture metal-sheathed platinum resistance thermometers (PRTs), noble metal thermocouples, base metal thermocouples, and their respective cables. The following test shall be performed to meet the requirements specified: breaking force test; wet chemical analysis; fusion calorimetric analysis; quantitative analysis; and density determination.
SCOPE
1.1 This specification covers the requirements for magnesium oxide (MgO) and aluminum oxide (Al2O3) powders and crushable insulators used to manufacture base metal thermocouples, metal-sheathed platinum resistance thermometers (PRTs), noble metal thermocouples, and their respective cables.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.3 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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2015
• ICS: 17.200.20 - Temperature-measuring instruments
• ICS: 29.035.30 - Glass and ceramic insulating materials
• Technical Committee: E20 - Temperature Measurement
• Drafting Committee: E20.13 - Thermocouples - Materials and Accessories Specifications

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:E1652 −15 An American National Standard
Standard Specification for
Magnesium Oxide and Aluminum Oxide Powder and
Crushable Insulators Used in the Manufacture of Base Metal
Thermocouples, Metal-Sheathed Platinum Resistance
1
Thermometers, and Noble Metal Thermocouples
This standard is issued under the fixed designation E1652; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope C832Test Method for Measuring Thermal Expansion and
Creep of Refractories Under Load
1.1 This specification covers the requirements for magne-
D2766Test Method for Specific Heat of Liquids and Solids
sium oxide (MgO) and aluminum oxide (Al O ) powders and
2 3
3
(Withdrawn 2018)
crushable insulators used to manufacture base metal
E228Test Method for Linear Thermal Expansion of Solid
thermocouples, metal-sheathed platinum resistance thermom-
Materials With a Push-Rod Dilatometer
eters (PRTs), noble metal thermocouples, and their respective
E235 Specification for Type K and Type N Mineral-
cables.
Insulated, Metal-Sheathed Thermocouples for Nuclear or
1.2 The values stated in SI units are to be regarded as the
for Other High-Reliability Applications
standard. The values given in parentheses are for information
E344Terminology Relating to Thermometry and Hydrom-
only.
etry
1.3 This standard does not purport to address all of the E585/E585M Specification for Compacted Mineral-
safety concerns, if any, associated with its use. It is the
Insulated, Metal-Sheathed, Base Metal Thermocouple
responsibility of the user of this standard to establish appro- Cable
priate safety and health practices and determine the applica-
E1137/E1137MSpecification for Industrial Platinum Resis-
bility of regulatory limitations prior to use. tance Thermometers
1.4 This international standard was developed in accor-
E1225Test Method for Thermal Conductivity of Solids
dance with internationally recognized principles on standard- Using the Guarded-Comparative-Longitudinal Heat Flow
ization established in the Decision on Principles for the Technique
Development of International Standards, Guides and Recom-
E2181/E2181M Specification for Compacted Mineral-
mendations issued by the World Trade Organization Technical Insulated, Metal-Sheathed, Noble Metal Thermocouples
Barriers to Trade (TBT) Committee.
and Thermocouple Cable
2. Referenced Documents
3. Terminology
2
2.1 ASTM Standards:
3.1 The definitions given in Terminology E344 shall apply
B329Test Method for Apparent Density of Metal Powders
to this specification.
and Compounds Using the Scott Volumeter
C809Test Methods for Chemical, Mass Spectrometric, and
4. Significance and Use
Spectrochemical Analysis of Nuclear-Grade Aluminum
4.1 Magnesium oxide and aluminum oxide are used to
Oxide and AluminumOxide-Boron Carbide Composite
electrically isolate and mechanically support the thermoele-
Pellets
ments of a thermocouple (see Specifications E235, E585/
E585M, and E2181/E2181M) and the connecting wires of a
1
This specification is under the jurisdiction of ASTM Committee E20 on
PRT(see Specification E1137/E1137M) within a metal sheath.
Temperature Measurement and is the direct responsibility of Subcommittee E20.13
The metal sheath is typically reduced in diameter to compact
on Thermocouples - Materials and Accessories Specifications.
Current edition approved Nov. 1, 2015. Published November 2015. Originally the oxide powder or crushable oxide insulators around the
approved in 1995. Last previous edition approved in 2014 as E1652–14a. DOI:
thermoelements or wires.
10.1520/E1652-15.
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
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E1652−15
TABLE 2 Chemical Requirements for Al O Type 1P
4.2 In order to be suitable for this purpose, the materials
2 3
A
and MgO Type 1P
shall meet certain criteria for purity and for mechanical and
Aluminum Oxide (Al O ) 99.65 % Magnesium Oxide (MgO) 99.40 %
2 3
dimensional characteristics. Material that does not meet the
(mass) min (mass) min
purity criteria may cause premature failure of the sensor.
Concentration, Concentration,
Impurity % (mass) Impurity % (mass)
4.3 Use of this specification for the procurement of powder
Al O 99.65
...

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: E1652 − 14a E1652 − 15
Standard Specification for
Magnesium Oxide and Aluminum Oxide Powder and
Crushable Insulators Used in the Manufacture of Base Metal
Thermocouples, Metal-Sheathed Platinum Resistance
1
Thermometers, and Noble Metal Thermocouples
This standard is issued under the fixed designation E1652; 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 the requirements for magnesium oxide (MgO) and aluminum oxide (Al O ) powders and crushable
2 3
insulators used to manufacture base metal thermocouples, metal-sheathed platinum resistance thermometers (PRTs), noble metal
thermocouples, and their respective cables.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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.
2. Referenced Documents
2
2.1 ASTM Standards:
B329 Test Method for Apparent Density of Metal Powders and Compounds Using the Scott Volumeter
C809 Test Methods for Chemical, Mass Spectrometric, and Spectrochemical Analysis of Nuclear-Grade Aluminum Oxide and
AluminumOxide-Boron Carbide Composite Pellets
C832 Test Method of Measuring Thermal Expansion and Creep of Refractories Under Load
D2766 Test Method for Specific Heat of Liquids and Solids
E228 Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
E235 Specification for Thermocouples, Sheathed, Type K and Type N, for Nuclear or for Other High-Reliability Applications
E344 Terminology Relating to Thermometry and Hydrometry
E585/E585M Specification for Compacted Mineral-Insulated, Metal-Sheathed, Base Metal Thermocouple Cable
E1137/E1137M Specification for Industrial Platinum Resistance Thermometers
E1225 Test Method for Thermal Conductivity of Solids Using the Guarded-Comparative-Longitudinal Heat Flow Technique
E2181/E2181M Specification for Compacted Mineral-Insulated, Metal-Sheathed, Noble Metal Thermocouples and Thermo-
couple Cable
3. Terminology
3.1 The definitions given in Terminology E344 shall apply to this specification.
4. Significance and Use
4.1 Magnesium oxide and aluminum oxide are used to electrically isolate and mechanically support the thermoelements of a
thermocouple (see Specifications E235, E585/E585M, and E2181/E2181M) and the connecting wires of a PRT (see Specification
E1137/E1137M) within a metal sheath. The metal sheath is typically reduced in diameter to compact the oxide powder or crushable
oxide insulators around the thermoelements or wires.
1
This specification is under the jurisdiction of ASTM Committee E20 on Temperature Measurement and is the direct responsibility of Subcommittee E20.04 on
Thermocouples.
Current edition approved May 1, 2014Nov. 1, 2015. Published May 2014November 2015. Originally approved in 1995. Last previous edition approved in 2014 as
E1652 – 14.E1652 – 14a. DOI: 10.1520/E1652-14a.10.1520/E1652-15.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1652 − 15
4.2 In order to be suitable for this purpose, the materials shall meet certain criteria for purity and for mechanical and
dimensional characteristics. Material that does not meet the purity criteria may cause premature failure of the sensor.
4.3 Use of this specification for the procurement of powder and crushable insulators will help to ensure that the product obtained
is suitable for the intended purpose.
4.4 Useful information about alumina and magnesia is given in the appendixes.
5. Classification
5.1 The purchaser shall specify the appropriate Material and Type from 5.2 through 5.6 below.
5.2 MgO Type 1 per in accordance with Table 1.
5.3 Al O Type 1 per in accordance with Table 1.
2 3
5.4 MgO Type 1P per in a
...