ASTM E1652-14

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Designation:E1652 −14
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 Jan. 15, 2014. Published February 2014. Originally
4.3 Use of this specification for the procurement of powder
approved in 1995. Last previous edition approved in 2010 as E1652–10. DOI:
and crushable insulators will help to ensure that the product
10.1520/E1652-14.
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.
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E1652−14
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 Fe2O
...