ASTM F1895-10
(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.
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Designation:F1895–10
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 3.1.3 silver migration—growth of fine crystals between
silver conductors of a thick film circuit due to an ionic reaction
1.1 This test method establishes procedures for the sub-
to the presence of water and an applied dc voltage potential.
mergingofamembraneswitchtoverifyresistancetoingressof
a specified liquid.
4. Significance and Use
1.2 This test method can also be used to verify the ability of
4.1 The presence of water inside a membrane switch can
a membrane switch or graphics layer to act as a liquid seal for
affect its mechanical operation or electrical functionality, or
a finished product.
both. Electrical failure can result as short circuits due to silver
1.3 Additional test methods or practices can be incorporated
migration or exceeding the specified resistance due to oxida-
to investigate specific results or capabilities.
tion.
1.4 This test method is a modification of National Electrical
4.2 This test method establishes a procedure to verify the
Manufacturers Assoc. (NEMA) Publication 250-1991 Section
ability of a membrane switch to resist the entry of liquid in
6.10, which is a test for submersion of a finished product
itself or a finished product, or both. It is useful in identifying
housing.
design deficiencies.
1.5 The values stated in inch-pound units are to be regarded
4.3 Submersion testing may be destructive, therefore any
as standard. The values given in parentheses are mathematical
samples tested should be considered unfit for future use.
conversions to SI units that are provided for information only
and are not considered standard.
5. Interferences
1.6 This standard does not purport to address all of the
5.1 External Venting—any deliberate external venting of the
safety concerns, if any, associated with its use. It is the
switch will allow liquid to enter.
responsibility of the user of this standard to establish appro-
5.2 Atmospheric Pressure—significant changes in atmo-
priate safety and health practices and determine the applica-
spheric pressure during the test or at different facilities may
bility of regulatory limitations prior to use.
alter the time in which leakage might occur.
2. Referenced Documents 5.3 Duration of Test—longer submersion time increases the
2 possibility of leakage.
2.1 National Electrical Manufacturers Assoc.:
5.4 Dye Coloring—chose a dye coloring that will not
(NEMA) Publication 250-1991
chemically attack the materials.
3. Terminology
6. Apparatus
3.1 Definitions:
6.1 Tub of sufficient size and depth (w/cover) for the entire
3.1.1 membrane switch—A momentary switching device in
switch, including any mounting surface to be submerged by at
which at least one contact is on, or made of, a flexible
least 1 in. (25.4 mm) or as specified.
substrate.
6.2 An appropriate device of fixture to hold the switch in a
3.1.2 specified resistance—maximum allowable resistance
fixed position.
as measured between two terminations whose internal switch
6.3 Any additional equipment as required by other test
contacts, when held closed, complete a circuit.
methods employed.
1
This test method is under the jurisdiction of ASTM Committee F01 on
7. Test Specimen
Electronics and is the direct responsibility of Subcommittee F01.18 on Membrane
7.1 The test specimens may be membrane switches with or
Switches.
Current edition approved May 1, 2010. Published June 2010. Originally without graphics.
approved in 1998. Last previous edition approved in 2004 as F1895 - 98 (2004).
7.2 Laminate to specified material or to a rigid clear
DOI: 10.1520/F1895-10.
material (using a clear material will facilitate visual inspec-
2
Available from National Electrical Manufacturers Association (NEMA), 1300
tion).
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 ----------------------
F1895–10
7.3 Membrane switches or graphic overlays designed to act 9.2.3 Keep UUT submerged for 24 h or as specified.
as a liquid seal for the finished product are to be applied to a 9.2.4 Remove UUT and allow to air dry.
rigid material. 9.2.5 Test switch for proper function if required.
9.2.6 Perform visual inspection to determine if liquid has
8. Conditioning
penetrated the UUT.
8.1 Condition specimens by exposure to ambient conditions
for 72 h prior to submersion to allow full cu
...
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:F1895–98(Reapproved2004)
Practice for Designation:F1895–10
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 practice test method establishes procedures for the submerging of a membrane switch to verify resistance to ingress
of a specified liquid.
1.2 This practicetest 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.
1.4This practice is a modification of National Electrical Manufacturers Assoc. (NEMA) Publication Number 250-1991 Section
6.10, which is a test for submersion of a finished product housing.
1.5The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information
only.
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
2.1 National Electrical Manufacturers Assoc.:
2
NEMA Publication 250-1991 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 practicetest 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.
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 May 1, 2004.2010. Published June 2004.2010. Originally approved in 1998. Last previous edition approved in 19982004 as F1895-1998. F1895
- 98 (2004). DOI: 10.1520/F1895-98R04.10.1520/F1895-10.
2
Available from NEMA, 1300 N 17th St., Suite 1847, Rosslyn, VA 22209.
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 ----------------------
F1895–10
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.
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
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