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Material
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Silicone
rubbers have various excellent characteristic features not obtained in
any organic rubbers, so that they play a very important role in
almost all industries including the
electrical and electronic business machines, automobiles, food,
medical, supplies, household commodities, articles for sports and hobbies, etc. |
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The contents of this section
include: |
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1.
General Properties Of Silicone Rubber
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(1) High
Bond Energy
The polymeric molecular structure of silicone rubbers
has a main chain formed of siloxane linkages Si-O. The
bond energy of the siloxane linkage Si-O is 106.0 kcal/mole
which is much higher than the bond energy 84.9 kcal/mole
of the carbon-to-carbon bond C-C.
This difference in the bond energies explain
the outstanding stability of silicone rubbers
in comparison with other organic rubbers . In general , silicone rubber have much better
heat resistance , electrical insulation , chemical
stability, etc.. than organic rubber. |
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(2)
Low intermolecular force and strong coil-forming |
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Dimenthylpolysiloxane,  a
typical polymeric constituent of silicone rubbers, has
a helical of coiled molecular configuration with a small intermolecular
force so that it has high resilience. large compressibility and
excellent cold resistance . Furthermore, the outwardly directed methyl groups
are able to rotate freely resulting in the unique surface
properties of silicones such as water repellence and
surface-releasability. |
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2.Charateristic
Features Of Silicone Rubber
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The characteristic features
of silicone rubber include:
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 Heat resistance
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Cold resistance
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Wheatherability
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Electrical conductivity
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Radiation resistance
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Thermal conductivity
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Steam resistance
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Chemical, oil and
solvent resistance
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Compression set
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Bending fatigue
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High tear strength
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Gas permeability
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Vibration absorption
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Electrical properties
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Transparency and coloration
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Non-stickiness and corrosion resistance
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For more details
of each characteristic feature, please click Characteristic
Features Of Silicone Rubber.
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3.Silicone
Rubber Applications
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Household Electric
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Anode Caps, Wedges, Defrosters in refrigerators
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Appliances
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Hot air brushes, Front door gaskets, Turn belts
of microwave oven
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Electric Wires
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Lead wires, Heater wires in heating jars, ignition
wires
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Business Machines
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Rubber contacts in pocket electronic calculator
and keyboards
EMI gaskets
Rubber rollers in PPC copying machines
Platen rollers in printers and telecopier machines
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Machines
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Hot stamp machines, Solar hoses, Vibration absorbing
rubber
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Automobiles
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Diaphragms, Plug boots, Water connectors
Radiator hoses, Turbo charger hoses
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Food Industry Products
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Gasket of pressure cookers, packing of vacuum bottles
Gaskets of electronic-controlled jars, Nipples of nursing bottles
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Hobby Goods
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Goggles, snorkels, mouthpieces, goggle bands
Swimming caps
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4.Raw
Silicone Rubber
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Major raw silicone material
suppliers are:
Shinetsu, Dow-Corning, Toray, Toshiba, GE, Wicker and Bayer.
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One major parameter used
to define silicone rubber is material hardness/durometer. This can
be defined in both Shore or JIS value.
Below is a conversion table for Shore and JIS.
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30
32
35
38
40
43
45
49
50
54
55
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29
30
33
35
37
40
42
45
46
50
51
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59
60
64
65
69
70
74
75
80
85
90
95
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55
56
60
61
65
66
70
71
75
80
85
90
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Range of hardness for Silicone
rubber is between 30 .JIS to 90 JIS.
For remote control keypads, the general hardness used is between 50
JIS and 60 JIS
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