ASTM F1596-07
(Test Method)Standard Test Method for Exposure of Membrane Switches to Temperature and Relative Humidity
Standard Test Method for Exposure of Membrane Switches to Temperature and Relative Humidity
SIGNIFICANCE AND USE
Changes in temperature and humidity during shipping, storage or use can affect the visual appearance, mechanical integrity, or electrical functionality of switches. This practice simulates three different environments to which membrane switches may be exposed.
The three industry-recognized switch categories based on performance levels are Level 1, Level 2, and Level 3 (see section 8.1).
Additionally, there may be custom requirements that vary by application, therefore, these requirements can be determined by customer and vendor agreement and be established as a Level 4.
This practice defines the duration of a single cycle. Multiple cycles may be appropriate depending on the requirements of the application.
SCOPE
^SCOPE:
1.1 This test method covers a procedure for temperature and humidity cycling of membrane switches.
1.2 This test method is performed to evaluate the properties of materials used in the construction of membrane switch assemblies as they are influenced by the absorption and diffusion of moisture and moisture vapor. This is an accelerated environmental test, accomplished by the continuous exposure of the test specimen to high relative humidity at an elevated temperature. Absorption of moisture by many materials results in swelling, which destroys their functional utility, causes loss of physical strength, and changes in other mechanical properties. Insulating materials which absorb moisture may suffer degradation of their electrical properties.
1.2.1 Physical changes:
1.2.1.1 Differential contraction or expansion rates or induced strain of dissimilar materials.
1.2.1.2. Cracking of surface coatings.
1.2.1.3 Leaking of sealed compartments.
1.2.1.4 Deformation or fracture of components.
1.2.2 Chemical changes:
1.2.2.1 Separation of constituents.
1.2.2.2 Failure of chemical agent protection.
1.2.3 Electrical changes:
1.2.3.1 Changes in electronic and electrical components.
1.2.3.2 Electronic or mechanical failures due to rapid water of condensate formation.
1.2.3.3 Excessive static electricity.
1.3 This test method is not intended to be a thermal shock procedure; a ramp rate between temperature extremes should not exceed 2°C/min.
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.
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Designation: F1596 − 07
StandardTest Method for
Exposure of Membrane Switches to Temperature and
1
Relative Humidity
This standard is issued under the fixed designation F1596; 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 priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 Thistestmethodcoversaprocedurefortemperatureand
humidity cycling of membrane switches.
2. Referenced Documents
2
1.2 This test method is performed to evaluate the properties
2.1 ASTM Standards:
of materials used in the construction of membrane switch
F1661 Test Method for Determining the Contact Bounce
assemblies as they are influenced by the absorption and
Time of a Membrane Switch
diffusionofmoistureandmoisturevapor.Thisisanaccelerated
F1662 Test Method for Verifying the Specified Dielectric
environmental test, accomplished by the continuous exposure
Withstand Voltage and Determining the Dielectric Break-
of the test specimen to high relative humidity at an elevated
down Voltage of a Membrane Switch
temperature.Absorption of moisture by many materials results
F1663 Test Method for Determining the Capacitance of a
in swelling, which destroys their functional utility, causes loss
Membrane Switch
of physical strength, and changes in other mechanical proper-
F1680 Test Method for Determining Circuit Resistance of a
ties. Insulating materials which absorb moisture may suffer
Membrane Switch
degradation of their electrical properties.
F1689 Test Method for Determining the Insulation Resis-
1.2.1 Physical changes:
tance of a Membrane Switch
1.2.1.1 Differential contraction or expansion rates or in-
F2592 Test Method for Measuring the Force-Displacement
duced strain of dissimilar materials.
of a Membrane Switch
1.2.1.2 Cracking of surface coatings.
3. Terminology
1.2.1.3 Leaking of sealed compartments.
1.2.1.4 Deformation or fracture of components.
3.1 Definitions:
1.2.2 Chemical changes: 3.1.1 membrane switch—a momentary switching device in
1.2.2.1 Separation of constituents. which at least one contact is on, or made of, a flexible
1.2.2.2 Failure of chemical agent protection. substrate.
1.2.3 Electrical changes:
4. Significance and Use
1.2.3.1 Changes in electronic and electrical components.
4.1 Changes in temperature and humidity during shipping,
1.2.3.2 Electronic or mechanical failures due to rapid water
storage or use can affect the visual appearance, mechanical
of condensate formation.
integrity, or electrical functionality of switches. This practice
1.2.3.3 Excessive static electricity.
simulates three different environments to which membrane
1.3 This test method is not intended to be a thermal shock
switches may be exposed.
procedure; a ramp rate between temperature extremes should
4.2 The three industry-recognized switch categories based
not exceed 2°C/min.
on performance levels are Level 1, Level 2, and Level 3 (see
1.4 This standard does not purport to address all of the
section 8.1).
safety concerns, if any, associated with its use. It is the
4.3 Additionally, there may be custom requirements that
responsibility of the user of this standard to establish appro-
vary by application, therefore, these requirements can be
determined by customer and vendor agreement and be estab-
lished as a Level 4.
1
This test method is under the jurisdiction of ASTM Committee F01 on
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
2
Switches. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2007. Published December 2007. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1995. Last previous edition approved in 2005 as F1596–00 (2005). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/F1596-07. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
F1596 − 07
4.4 This practice defines the duration of a single cycle. 8. Procedure
Multiple cycles may be appropriate depending on the require-
8.1 Subject the preconditioned specimens to the exposure
ments of the application.
test cycle as illustrated in Table 1.
8.2 Return to room temperature and prepare for evaluation.
5. Apparatus
3
9. Report
5.1 Closed system, with temperature and humidity control.
9.1 Report the following information:
5.2 The formation of condensation during rising tempera-
9.1.1 Visual Changes.
ture cyc
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:F 1596–00(Reapproved2005)
Standard Practice for Designation: F 1596 – 07
Standard Test Method for
Exposure of Membrane Switches to Temperature and
1
Relative Humidity
This standard is issued under the fixed designation F 1596; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1This practice covers a procedure for temperature and humidity cycling of membrane switches.
1.2This practice is designed to determine changes induced by temperature and humidity.
1.3This practice is not intended to be a thermal shock procedure; a gradual ramp rate between conditions is required.
1.1 This test method covers a procedure for temperature and humidity cycling of membrane switches.
1.2 This test method is performed to evaluate the properties of materials used in the construction of membrane switch
assemblies as they are influenced by the absorption and diffusion of moisture and moisture vapor. This is an accelerated
environmental test, accomplished by the continuous exposure of the test specimen to high relative humidity at an elevated
temperature. Absorption of moisture by many materials results in swelling, which destroys their functional utility, causes loss of
physical strength, and changes in other mechanical properties. Insulating materials which absorb moisture may suffer degradation
of their electrical properties.
1.2.1 Physical changes:
1.2.1.1 Differential contraction or expansion rates or induced strain of dissimilar materials.
1.2.1.2 Cracking of surface coatings.
1.2.1.3 Leaking of sealed compartments.
1.2.1.4 Deformation or fracture of components.
1.2.2 Chemical changes:
1.2.2.1 Separation of constituents.
1.2.2.2 Failure of chemical agent protection.
1.2.3 Electrical changes:
1.2.3.1 Changes in electronic and electrical components.
1.2.3.2 Electronic or mechanical failures due to rapid water of condensate formation.
1.2.3.3 Excessive static electricity.
1.3 This test method is not intended to be a thermal shock procedure; a ramp rate between temperature extremes should not
exceed 2°C/min.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
F 1661 Test Method for Determining the Contact Bounce Time of a Membrane Switch
1
This practice test method is under the jurisdiction of ASTM Committee F01 on Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
Switches .
Current edition approved MayDec. 1, 2005.2007. Published June 2005.December 2007. Originally approved in 1995. Last previous edition approved in 20002005 as F
1596–00 (2005).
2
A closed system such as a Tenney T3ORC, Despatch EC 619, or Espec EMX, available from Tenney, Inc., Union, NJ 07083; Despatch Industries, Minneapolis, MN
55440-1320; ESPEC Corp., Grand Rapids, MI 49509, have been found satisfactory for this purpose.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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 ----------------------
F 1596 – 07
F 1662 Test Method for Verifying the Specified Dielectric Withstand Voltage and Determining the Dielectric Breakdown
Voltage of a Membrane Switch
F 1663 Test Method for Determining the Capacitance of a Membrane Switch
F 1680 Test Method for Determining Circuit Resistance of a Membrane Switch
F 1689 Test Method for Determining the Insulation Resistance of a Membrane Switch
F 2592 Test Method for Measuring the Force-Displacement of a Membrane Switch
3. Terminology
2.1
3.1 Definition:
2.1.1
3.1.1 membrane switch—a momentary switching device in which at least one contact is on, or made of, a flexible substrate.
3.
4. Significance and Use
34.1 Changes in temperature and humidity during shipping, storage or use can affect the visual appearance, mechanical
integrity, or electrical functionality of switches. This practice s
...
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