ASTM E1652-14a
(Specification)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
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.
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Designation:E1652 −14a
StandardSpecification 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 E235Specification for Thermocouples, Sheathed, Type K
and Type N, for Nuclear or for Other High-Reliability
1.1 This specification covers the requirements for magne-
Applications
sium oxide (MgO) and aluminum oxide (Al O ) powders and
2 3
E344Terminology Relating to Thermometry and Hydrom-
crushable insulators used to manufacture base metal
etry
thermocouples, metal-sheathed platinum resistance thermom-
E585/E585M Specification for Compacted Mineral-
eters (PRTs), noble metal thermocouples, and their respective
Insulated, Metal-Sheathed, Base Metal Thermocouple
cables.
Cable
1.2 The values stated in SI units are to be regarded as the
E1137/E1137MSpecification for Industrial Platinum Resis-
standard. The values given in parentheses are for information
tance Thermometers
only.
E1225Test Method for Thermal Conductivity of Solids
1.3 This standard does not purport to address all of the Using the Guarded-Comparative-Longitudinal Heat Flow
safety concerns, if any, associated with its use. It is the
Technique
responsibility of the user of this standard to establish appro- E2181/E2181M Specification for Compacted Mineral-
priate safety and health practices and determine the applica-
Insulated, Metal-Sheathed, Noble Metal Thermocouples
bility of regulatory limitations prior to use. and Thermocouple Cable
3. Terminology
2. Referenced Documents
2
3.1 The definitions given in Terminology E344 shall apply
2.1 ASTM Standards:
to this specification.
B329Test Method for Apparent Density of Metal Powders
and Compounds Using the Scott Volumeter
4. Significance and Use
C809Test Methods for Chemical, Mass Spectrometric, and
4.1 Magnesium oxide and aluminum oxide are used to
Spectrochemical Analysis of Nuclear-Grade Aluminum
electrically isolate and mechanically support the thermoele-
Oxide and AluminumOxide-Boron Carbide Composite
ments of a thermocouple (see Specifications E235, E585/
Pellets
E585M, and E2181/E2181M) and the connecting wires of a
C832Test Method of Measuring Thermal Expansion and
PRT(see Specification E1137/E1137M) within a metal sheath.
Creep of Refractories Under Load
The metal sheath is typically reduced in diameter to compact
D2766Test Method for Specific Heat of Liquids and Solids
the oxide powder or crushable oxide insulators around the
E228Test Method for Linear Thermal Expansion of Solid
thermoelements or wires.
Materials With a Push-Rod Dilatometer
4.2 In order to be suitable for this purpose, the materials
shall meet certain criteria for purity and for mechanical and
1
This specification is under the jurisdiction of ASTM Committee E20 on
dimensional characteristics. Material that does not meet the
Temperature Measurement and is the direct responsibility of Subcommittee E20.04
purity criteria may cause premature failure of the sensor.
on Thermocouples.
Current edition approved May 1, 2014. Published May 2014. Originally
4.3 Use of this specification for the procurement of powder
approved in 1995. Last previous edition approved in 2014 as E1652–14. DOI:
and crushable insulators will help to ensure that the product
10.1520/E1652-14a.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or obtained is suitable for the intended purpose.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.4 Usefulinformationaboutaluminaandmagnesiaisgiven
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in the appendixes.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E1652−14a
TABLE 2 Chemical Requirements for Al O Type 1P
5. Classification
2 3
A
and MgO Type 1P
5.1 ThepurchasershallspecifytheappropriateMaterialand
Aluminum Oxide (Al O ) 99.65 % Magnesium Oxide (MgO) 99.40 %
2 3
Type from 5.2 through 5.6 below.
(mass) min (mass) min
Concentration, Concentration,
5.2 MgO Type 1 per Table 1.
Impurity % (mass) Impurity % (mass)
5.3 Al O Type 1 per Table 1.
2 3 Al2O3 99.65 % min MgO 99.40 % min
CaO 0.08 max CaO 0.35 max
5.4 MgO Type 1P per Table 2.
SiO2 0.08 max SiO2 0.13 max
MgO 0.08 max Al2O3 0.15 max
5.5 Al O Type 1P per Table 2.
2 3
Fe2O3 0.04 max Fe2O3 0.
...
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 − 14 E1652 − 14a
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 Jan. 15, 2014May 1, 2014. Published February 2014May 2014. Originally approved in 1995. Last previous edition approved in 20102014 as
E1652 – 10.E1652 – 14. DOI: 10.1520/E1652-14.10.1520/E1652-14a.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E1652 − 14a
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 Table 1.
5.3 Al O Type 1 per Table 1.
2 3
5.4 MgO Type 1P per Table 2.
5.5 Al O Type 1P per Table 2
...
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