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ASTM B362-91(2020)

(Test Method)

Standard Test Method for Mechanical Torque Rate of Spiral Coils of Thermostat Metal

Standard Test Method for Mechanical Torque Rate of Spiral Coils of Thermostat Metal

SIGNIFICANCE AND USE
4.1 This test method is useful to determine the mechanical force of spiral coils of thermostat metal.  
4.2 The mechanical properties of a coil may vary from lot to lot of thermostat metal material. This method is useful for determining the optimum thickness and length of the material for a given mechanical torque specification.  
4.3 This test is useful as a quality test to determine acceptance or rejection of a lot of thermostat metal coils.
SCOPE
1.1 The test method covers the principles of determining the mechanical torque rate of spiral coils of thermostat metal.  
Note 1: This test method has been developed particularly to cover the determination of the mechanical torque rate of spiral coils made of thermostat metal for carburetors and manifold heat controls. The method is not limited to thermostat metals and can be used for spiral coils of other materials for which the torque rate must be measured accurately.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.  
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 become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
1.4 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
Published
Publication Date
30-Sep-2020
ICS
29.120.20 - Connecting devices
Technical Committee
B02 - Nonferrous Metals and Alloys
Drafting Committee
B02.10 - Thermostat Metals and Electrical Resistance Heating Materials
Current Stage
Ref Project

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ASTM B362-91(2020) - Standard Test Method for Mechanical Torque Rate of Spiral Coils of Thermostat MetalASTM B362-91(2020) - Standard Test Method for Mechanical Torque Rate of Spiral Coils of Thermostat Metal
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ASTM B362-91(2020) - Standard Test Method for Mechanical Torque Rate of Spiral Coils of Thermostat Metal
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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.
Designation: B362 − 91 (Reapproved 2020)
Standard Test Method for
Mechanical Torque Rate of Spiral Coils of Thermostat Metal
This standard is issued under the fixed designation B362; 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 3. Summary of Test Method
1.1 The test method covers the principles of determining the
3.1 The test for mechanical torque rate of spiral coils
mechanical torque rate of spiral coils of thermostat metal.
consists of applying a torque, or moment of force, that will not
stress the material in excess of its elastic limits, to the coil and
NOTE 1—This test method has been developed particularly to cover the
determination of the mechanical torque rate of spiral coils made of measuring the resulting deflection as angular rotation. Of the
thermostat metal for carburetors and manifold heat controls. The method
several methods for obtaining this value, it is preferred that the
is not limited to thermostat metals and can be used for spiral coils of other
outer end of the spiral coil be held stationary, but not fixed, and
materials for which the torque rate must be measured accurately.
the inner end of the coil be rotated after applying a load to the
1.2 The values stated in inch-pound units are to be regarded
outer end of the coil at a fixed radius.
as the standard. The metric equivalents of inch-pound units
may be approximate.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 This test method is useful to determine the mechanical
safety concerns, if any, associated with its use. It is the
force of spiral coils of thermostat metal.
responsibility of the user of this standard to become familiar
with all hazards including those identified in the appropriate
4.2 The mechanical properties of a coil may vary from lot to
Safety Data Sheet (SDS) for this product/material as provided
lot of thermostat metal material. This method is useful for
by the manufacturer, to establish appropriate safety, health,
determining the optimum thickness and length of the material
and environmental practices, and determine the applicability
for a given mechanical torque specification.
of regulatory limitations prior to use.
4.3 This test is useful as a quality test to determine accep-
1.4 This international standard was developed in accor-
tance or rejection of a lot of thermostat metal coils.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
5. Apparatus
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5.1 The determination of the mechanical torque rate of
Barriers to Trade (TBT) Committee.
spiral coils is subject to many variables and is sensitive to the
degree that even different apparatus employing the same test
2. Terminology
principles will give different results. Therefore it is recom-
2.1 thermostat metal, n—a composite material, usually in
mended that the apparatus be standardized. The apparatus
the form of sheet or strip, comprising two or more materials of
shown in Fig. 1 and Fig. 2 and consisting essentially of the
any appropriate nature, metallic or otherwise, that, by virtue of
following components, has been found satisfactory:
the differing expansivities of the components, tends to alter its
5.1.1 Specimen Holder—A specimen holder shall provide
curvature when its temperature is changed.
for securely holding the inner end of the test specimen.
2.2 mechanical torque rate, n—the ratio of torque to deflec-
Preferably, the holder or mounting arbor shall be of circular
tion. It is a measure of the stiffness of the coil and may have the
cross section whose diameter is as large as possible without
units of ounce inch or gram centimetre per angular degree.
touching the inner turn of the coil under any test conditions of
load. The end of the arbor shall be slotted entirely across its
2.3 spiral coil, n—a part made by winding strip on itself.
diameter, to a depth greater than the width of the specimen, and
of a width slightly narrower than the thickness of the specimen.
Thus, the inner tab will be a push or snug fit in the slot for its
This test method is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
entire width. The edges of the slot shall be sharp where it
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
intersects the circumference of the arbor. The slot shall be so
Current edition approved Oct. 1, 2020. Published October 2020. Originally
positioned in the arbor that the center of rotation of the arbor
approved in 1960. Last previous edition approved in 2016 as B362 – 91 (2016).
DOI: 10.1520/B0362-91R20. and the coil will coincide.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United S
...

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SCOPE
1.1 This test method covers all residential pressure connection systems. Detailed examples of application to specific types of connection systems, set-screw neutral bus connectors, and twist-on wire-splicing connectors are provided in Appendix X1 and Appendix X2.  
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4.1 Preservation of a conducting surface on electrical contact is vital to the continued functioning of such contacts. Contamination of the surface with insulating layers formed by corrosion processes is one potential hazard. Laboratory testing of contacts in MFG tests is used to assess the effectiveness of design features and materials.  
4.2 MFG tests are used in development studies of processes and materials for contacts. For example, coupon specimens may be exposed to MFG tests to evaluate new contact materials, layers of new coating materials on a supporting substrate, reduced coating thicknesses, or protective surface treatments.  
4.3 MFG tests are also employed to test the durability of a finished product with respect to atmospheric corrosion. For example, finished connectors may be exposed to a MFG test and their performances compared against each other or against a set of fixed requirements. Relays or switch contacts may be exposed in the operated and non-operated conditions to compare performance.  
4.4 MFG tests are useful for determining the effectiveness of connector housings and shrouds as barriers to ingress of atmospheric corrodants to the contact surfaces. These tests can also be used to assess the screening of the metal-to-metal contact areas of mated connectors.  
4.5 MFG tests are employed as qualification tests to determine connector failure rates in application environments for which correlation between test and application has previously been established.  
4.6 This guide provides test conditions which are to be applied in conjunction with Practice B827 which defines the required test operation and certification procedures, tolerances, and reporting requirements. Where the test specifier requires certifications or tolerances different than those provided in Practice B827, the required certifications or tolerances shall be part of the test specification. Differences from the specifications in Practice B827 shall be reported in the test re...
SCOPE
1.1 The techniques described in this guide pertain to mixed flowing gas (MFG) tests containing species that are applied to evaluate devices containing electrical contacts such as slip rings, separable connectors, electromechanical relays or switch contacts. These techniques may be relevant to other devices, but it is the responsibility of the user to determine suitability prior to testing.  
1.2 The MFG tests described in this guide are designed to accelerate corrosive degradation processes. These accelerations are designed such that the degradation occurs in a much shorter time period than that expected for such processes in the intended application environment of the device being tested. Application environments can vary continuously from benign to aggressively corrosive. Connectors and contacts within closed electronic cabinets may be affected by an environment of different severity than the environment on the outside of such cabinets. In general, indoor environments are different than outdoor environments. The MFG tests described herein, being discrete embodiments of specific corrosive conditions, cannot be representative of all possible application environments. It is the responsibility of the test specifier to assure the pertinence of a given test condition to the specifier's application condition.  
1.3 The MFG tests described herein are not designed to duplicate the actual intended application environment of the device under test. An extended bibliography that provides information which is useful to test specifiers to assist them in selecting appropriate test methods is included in this guide. The bibliography covers the scope from application condition characterization, single and multiple gas effects, and material and product effects to key application and test variables as well as discussions of atmospheric corrosion processes.  
1.4 The values stated in SI units are to be regarded as standard. No other uni...

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