ASTM F1683-96a
(Practice)Standard Practice for Creasing or Bending a Membrane Switch, Membrane Switch Tail Assembly or Membrane Switch Component
Standard Practice for Creasing or Bending a Membrane Switch, Membrane Switch Tail Assembly or Membrane Switch Component
SCOPE
1.1 This practice establishes a method for the creasing or bending of any part of a membrane switch.
1.2 This practice can be used with other test methods to achieve specific test results.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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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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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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: F 1683 – 96a
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Creasing or Bending a Membrane Switch, Membrane Switch
1
Tail Assembly or Membrane Switch Component
This standard is issued under the fixed designation F 1683; 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
1.1 This practice establishes a method for the creasing or
bending of any part of a membrane switch.
1.2 This practice can be used with other test methods to
achieve specific test results.
1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Terminology
2.1 Definitions:
2.1.1 bend—to force from a straight form into a different
and especially a curved one.
2.1.1.1 Discussion—In this case no 88hard” or angled crease
or fold is to occur. The substrate will only be formed into a
radius.
2.1.2 bend cycle—a fold of a sample around a specified
mandrel which is 88rolled” in one direction, followed by rolling
in the opposite direction, returning the sample to its original
FIG. 1 Bend Cycle
position (see Fig. 1).
2.1.3 crease—a ridge or groove made by folding and
components can affect their visual appearance, mechanical
pressing.
integrity or electrical functionality. This practice simulates
2.1.3.1 Discussion—In this case a fold mark in the substrate
conditions that may be seen during manufacture, installation or
will be caused by a weight rolled over a fold that will likely
use.
remain in the substrate after testing.
3.2 Bend or crease testing may be destructive, therefore any
2.1.4 crease cycle—a 180° crease followed by a flattening
samples tested should be considered unfit for future use.
of the crease (see Fig. 2).
3.3 Specific areas of testing include, but are not limited to:
2.1.5 mandrel—a cylindrically shaped metal rod, such as
3.3.1 Membrane flex tails, and
brazing or drill rod.
3.3.2 Any component of a membrane switch that may be
2.1.6 membrane switch—a momentary switching device in
subjected to bending or creasing.
which at least one contact is on (or made of) a flexible
substrate.
4. Interferences
3. Significance and Use
4.1 The following parameters may affect the results of this
3.1 Bending or creasing of membrane switches or their test:
4.1.1 Temperature, and
4.1.2 Humidity.
1
This practice is under the jurisdiction of ASTM Committee F-1 on Electronics
and is the direct responsibility of Subcommittee F01.18 on Membrane Switches.
5. Apparatus
Current edition approved June 10, 1996. Published August 1996. Originally
published as F 1683 – 96. Last previous edition F 1683 – 96. 5.1 Crease Practice:
1
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F 1683
5.2.2 Adhesive Tape or fixture to hold specimen securely in
place.
6. Test Specimens
6.1 The test specimens may be components, tail assembles
or finished switches subject to bending or creasing.
6.2 The width of the test specimen must not exceed the
length of the mandrel or height of the weight to be used.
7. Procedure
7.1 Crease Procedure:
7.1.1 Securely attach one end of the specimen to be tested to
a hard flat surface.
7.1.2 Gently bend the test specimen into as large a loop as
possible. Secure the loose end of the specimen (top portion of
the loop) to the previously secured end.
7.1.3 Roll the weight from the secured ends of the specimen
towards the end of the loop (Fig. 2) at a speed of 20.4 mm (1
in.)/s6 20 %. Roll the weight completely off the end of the
loop creating a crease.
7.1.4 Immediately open the creased specimen and turn it
over such that the crease is now open and facing down.
7.1.5 Roll the specified weight over the crease in the same
manner as before to flatten the crease.
7.1.6 Repeat for specified number of cycles.
NOTE 2—Care must be taken to ensure that the weight rests only on the
specimen, not on adjacent surfaces. In addition, the direction of travel of
the weight must be perpendicular to the crease. This is to ensure the entire
width of the specimen is creased at the same time.
7.2 Bend Procedure:
7.2.1 Wrap the unsecured end of the specimen tightly over
the mandrel such that the specimen contacts 50 % of the
circumference surface of the mandrel. Pu
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