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Materials and
contact resistance
Materials
For our standard switches, we use high-quality, cadmium-free plastics
which are optimized for the intended application. As a rule, we seek to
avoid the use of toxic or hazardous materials. You can ?nd out more about
our materials policy by consulting our hazardous substances exclusion list.
Behaviour of materials in ?re
Insulating materials which are directly connected to electrically conduc-
tive parts are classi?ed according to their degree of ?ammability. Most of
the materials we use to manufacture housings are self-extinguishing and
categorised under the UL 94 V0 standard.
Tracking resistance
Most of the insulating materials we use in our snap switches have a proof
tracking index of PTI 250 (PTI 300, e.g. D4) or PTI 175 (PTI 250, e.g.
DB, DC). This means that they are capable of 50 drops of test ?uid at a
Contact resistance
The contact resistance of snap switches is composed of the contact resis-
tance and the resistance of the conductive parts. It depends primarily on
the construction and the contact material. The contact resistance of silver
contacts is max. 100 m , of gold contacts max. 50 m when they are new.
Insulation resistance
The insulation resistance between the conductive parts of our snap switches
and a conductive underlay or between the open contacts exceeds 10 M
when they are new, measured over a period of one minute at room tem-
perature with 500 V DC.
Caution: humidity and soiling can decrease the insulation resistance.
Designations
test voltage of 250 V without producing any leakage current (IEC 60112).
RoHS
Switches without leads already conform to RoHS. Switches with leads
are available in RoHS-conforming models on request. In case of further
processing with lead-free soldering, the product-speci?c solder recommen-
dations must be heeded.
Glow wire test
The insulation materials used for snap switches with ENEC approval ful?l
the required ?lament tests GWFI according to the household appliance
standard IEC 60335-1 at 850 °C and GWIT at 775 °C or alternatively the
?lament test GWT at 750 °C.
ASA
LCP
LSR
PA
PBT
PET
POM
PPHS
PPS
SI
TPE
VMQ
Acrylonitrile-styrene-acrylicester
Liquidcristal polymer
Liquid silicone rubber
Polyamide
Polybutyleneterephthalate
Polyethyleneterephthalate
Polyacetal
Polyphenylene sulphide
Polyether sulphone
Silicone
Thermoplastic elastomer
Vinyl-methyl-polysiloxane
Degree of ?ammability
UL ICE / VDE
In vertical ?ammability test,
goes out after no more than
Drops of molten material
capable of igniting wadding
Max. duration
of afterglow
V-0
V-1
V-2
FV-0
FV-1
FV-2
5 seconds
25 seconds
25 seconds
no
no
possibly
30 seconds
30 seconds
60 seconds
HB
FH
Burning rate in horizontal ?ammability test: up to 3 mm thick < 7.5 mm/min;
over 3 mm thick > 3.8 mm/min
19
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