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ASTM F1895-10a

(Practice)

Practice for Submersion of a Membrane Switch

Practice for Submersion of a Membrane Switch

SIGNIFICANCE AND USE
The presence of water inside a membrane switch can affect its mechanical operation or electrical functionality, or both. Electrical failure can result as short circuits due to silver migration or exceeding the specified resistance due to oxidation.
This test method establishes a procedure to verify the ability of a membrane switch to resist the entry of liquid in itself or a finished product, or both. It is useful in identifying design deficiencies.
Submersion testing may be destructive, therefore any samples tested should be considered unfit for future use.
SCOPE
1.1 This test method establishes procedures for the submerging of a membrane switch to verify resistance to ingress of a specified liquid.
1.2 This test method can also be used to verify the ability of a membrane switch or graphics layer to act as a liquid seal for a finished product.
1.3 Additional test methods or practices can be incorporated to investigate specific results or capabilities.
1.4 This test method is a modification of National Electrical Manufacturers Assoc. (NEMA) Publication 250-1991 Section 6.10, which is a test for submersion of a finished product housing.
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.6 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
30-Nov-2010
ICS
31.220.20 - Switches
Technical Committee
F01 - Electronics
Drafting Committee
F01.18 - Printed Electronics
Current Stage
Ref Project

Relations

Replaces
ASTM F1895-10 - Practice for Submersion of a Membrane Switch
Effective Date
01-Dec-2010

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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F1895 − 10a
StandardTest Method for
1
Submersion of a Membrane Switch
This standard is issued under the fixed designation F1895; 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 3.1.2 specified resistance—maximum allowable resistance
as measured between two terminations whose internal switch
1.1 This test method establishes procedures for the sub-
contacts, when held closed, complete a circuit.
mergingofamembraneswitchtoverifyresistancetoingressof
a specified liquid. 3.1.3 silver migration—growth of fine crystals between
silver conductors of a thick film circuit due to an ionic reaction
1.2 This test method can also be used to verify the ability of
to the presence of water and an applied dc voltage potential.
a membrane switch or graphics layer to act as a liquid seal for
a finished product.
4. Significance and Use
1.3 Additional test methods or practices can be incorporated
4.1 The presence of water inside a membrane switch can
to investigate specific results or capabilities.
affect its mechanical operation or electrical functionality, or
1.4 This test method is a modification of National Electrical
both. Electrical failure can result as short circuits due to silver
Manufacturers Assoc. (NEMA) Publication 250-1991 Section
migration or exceeding the specified resistance due to oxida-
6.10, which is a test for submersion of a finished product
tion.
housing.
4.2 This test method establishes a procedure to verify the
1.5 The values stated in inch-pound units are to be regarded
ability of a membrane switch to resist the entry of liquid in
as standard. The values given in parentheses are mathematical
itself or a finished product, or both. It is useful in identifying
conversions to SI units that are provided for information only
design deficiencies.
and are not considered standard.
4.3 Submersion testing may be destructive, therefore any
1.6 This standard does not purport to address all of the
samples tested should be considered unfit for future use.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Interferences
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5.1 External Venting—any deliberate external venting of the
switch will allow liquid to enter.
2. Referenced Documents
5.2 Atmospheric Pressure—significant changes in atmo-
2
spheric pressure during the test or at different facilities may
2.1 National Electrical Manufacturers Assoc.:
alter the time in which leakage might occur.
(NEMA) Publication 250-1991
5.3 Duration of Test—longer submersion time increases the
3. Terminology
possibility of leakage.
3.1 Definitions:
5.4 Dye Coloring—chose a dye coloring that will not
3.1.1 membrane switch—A momentary switching device in
chemically attack the materials.
which at least one contact is on, or made of, a flexible
substrate.
6. Apparatus
6.1 Tub of sufficient size and depth (w/cover) for the entire
switch, including any mounting surface to be submerged by at
1
This test method is under the jurisdiction of ASTM Committee F01 on
least 1 in. (25.4 mm) or as specified.
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
Switches.
6.2 An appropriate device of fixture to hold the switch in a
Current edition approved Dec. 1, 2010. Published December 2010. Originally
fixed position.
approved in 1998. Last previous edition approved in 2010 as F1895 - 10. DOI:
10.1520/F1895-10A.
2
6.3 Any additional equipment as required by other test
Available from National Electrical Manufacturers Association (NEMA), 1300
N. 17th St., Suite 1752, Rosslyn, VA 22209, http://www.nema.org. methods employed.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F1895 − 10a
7. Test Specimen 9.1.4 Allow liquid bath to stabilize to ambient temperature.
7.1 The test specimens may be membrane switches with or 9.2 In-Process Test
without graphics. 9.2.1 Test switch for proper function is required.
9.2.2 Position UUT in tub using appropriate fixturing; cover
7.2 Laminate to specified material or to a rigid clear
tub.
material (using a clear material will facilitate visual inspec-
9.2.3 Keep UUT submerged for 24 h or as specified.
tion).
9.2.4 Remove UUT and allow to air dry.
7.3 Membrane switches or graphic overlays designed to act
9.2.5 Test switch for proper function is required.
as a liquid seal for the finished product are to be applied to a
9.2.6 Perform
...

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:F1895–10 Designation:F1895–10a
Standard Test Method for
1
Submersion of a Membrane Switch
This standard is issued under the fixed designation F1895; 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 test method establishes procedures for the submerging of a membrane switch to verify resistance to ingress of a
specified liquid.
1.2 This test method can also be used to verify the ability of a membrane switch or graphics layer to act as a liquid seal for a
finished product.
1.3 Additional test methods or practices can be incorporated to investigate specific results or capabilities.
1.4 This test method is a modification of National Electrical ManufacturersAssoc. (NEMA) Publication 250-1991 Section 6.10,
which is a test for submersion of a finished product housing.
1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.6 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 National Electrical Manufacturers Assoc.:
(NEMA) Publication 250-1991
3. Terminology
3.1 Definitions:
3.1.1 membrane switch—A momentary switching device in which at least one contact is on, or made of, a flexible substrate.
3.1.2 specified resistance—maximum allowable resistance as measured between two terminations whose internal switch
contacts, when held closed, complete a circuit.
3.1.3 silver migration—growth of fine crystals between silver conductors of a thick film circuit due to an ionic reaction to the
presence of water and an applied dc voltage potential.
4. Significance and Use
4.1 The presence of water inside a membrane switch can affect its mechanical operation or electrical functionality, or both.
Electrical failure can result as short circuits due to silver migration or exceeding the specified resistance due to oxidation.
4.2 This test method establishes a procedure to verify the ability of a membrane switch to resist the entry of liquid in itself or
a finished product, or both. It is useful in identifying design deficiencies.
4.3 Submersion testing may be destructive, therefore any samples tested should be considered unfit for future use.
5. Interferences
5.1 External Venting—any deliberate external venting of the switch will allow liquid to enter.
5.2 Atmospheric Pressure—significant changes in atmospheric pressure during the test or at different facilities may alter the
time in which leakage might occur.
5.3 Duration of Test—longer submersion time increases the possibility of leakage.
5.4 Dye Coloring—chose a dye coloring that will not chemically attack the materials.
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 Switches.
Current edition approved MayDec. 1, 2010. Published JuneDecember 2010. Originally approved in 1998. Last previous edition approved in 20042010 as F1895 - 98
(2004). 10. DOI: 10.1520/F1895-10A.
2
Available from National Electrical Manufacturers Association (NEMA), 1300 N. 17th St., Suite 1752, Rosslyn, VA 22209, http://www.nema.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
F1895–10a
6. Apparatus
6.1 Tub of sufficient size and depth (w/cover) for the entire switch, including any mounting surface to be submerged by at least
1 in. (25.4 mm) or as specified.
6.2 An appropriate device of fixture to hold the switch in a fixed position.
6.3 Any additional equipment as required by other test methods employed.
7. Test Specimen
7.1 The test specimens may be membrane switches with or without graphics.
7.2 Laminate to specified material or to a rigid clear material (using a clear material will facilitate visual inspection).
7.3 Membrane switches or graphic overlays designed to act as a liquid seal for the finished product are to be applied to a rigid
material.
8. Conditioning
8.
...

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