ASTM F2112-02(2011)

Standard Terminology for Membrane Switches

SCOPE
1.1 This terminology defines terms that are commonly used in the membrane switch industry.
1.2 These definitions are not mutually exclusive.

General Information

• Status: Historical
• Publication Date: 31-Jan-2011
• ICS: 01.040.29 - Electrical engineering (Vocabularies)
• ICS: 29.120.40 - Switches
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.18 - Printed Electronics

Relations

• Replaces: ASTM F2112-02 - Standard Terminology for Membrane Switches
• Effective Date: 01-Feb-2011
• Replaced By: ASTM F2112-02(2019) - Standard Terminology for Membrane Switches (Withdrawn 2023)
• Effective Date: 01-Dec-2019

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F2112 − 02 (Reapproved 2011)
Standard Terminology for
Membrane Switches
This standard is issued under the fixed designation F2112; 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 dielectric withstand voltage—the maximum voltage a dielec-
tric can withstand in a membrane switch without a visual
1.1 This terminology defines terms that are commonly used
change from a voltage discharge or specified change of
in the membrane switch industry.
insulation resistance, or both.
1.2 These definitions are not mutually exclusive.
duty cycle—the ratio of switch closed time to total cycle time.
2. Terminology
graphic layer—optional decorated layer of a membrane
switch. See Fig. 1.
actuation force—the maximum force measured prior to or
including point at which contact closure is achieved on a insulation resistance—the electrical resistance between two
isolated test points on a membrane switch.
membrane switch.
leakage current—current flow through the insulation between
bend—to force from a straight form into different and espe-
test points.
cially a curved one.
membrane layer—a flexible dynamic layer which carries one
bend cycle—a fold of a sample around a specified mandrel
or both switch poles the deflection of which is used to short
which is “rolled” in one direction, followed by rolling in the
both poles together. The membrane layer is a required
opposite direction, returning the sample to its original
component of a membrane switch. See Fig. 1.
position.
membrane switch—a momentary switching device in which
circuit resistance—electrical resistance as measured between
at least one contact is on, or made of, a flexible substrate.
two test points whose internal contacts, when held closed,
complete a circuit.
membrane switch flex tail—flexible portion of a membrane
switch used for input/output connection.
conductor resistance—the measured electrical resistance
through a circuit loop between two test points. non–tactile switch—a switch assembly that has a tactile ratio
equal to zero.
contact bounce—intermittent contact opening and contact
open circuit resistance—minimum allowable resistance as
closure that may occur after switch operation.
measured between two test points that, if lower than, will
contact closure—the event at which a specified resistance is
indicate an electrical short.
achieved on a membrane switch.
power capacity—electrical power is defined as current ×
contact force—the force at contact closure.
voltage = V × I (watts)
crease—a ridge or groove made by folding and pressing.
rigid layer—provides mechanical support for the membrane
switch. See Fig. 1.
crease cycle—a 180 degree crease followed by a flattening of
the crease. silver migration—a process by which silver, when in contact
with insulating materials under electrical potential, is re-
current carrying capacity—the maximum level of electrical
movedionicallyfromitsoriginallocation,andisredeposited
currentthatacircuitcanconductwithoutsustainingdam
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