Page 5 - Jabar Catalog Silicone2

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5
Technical Data
Silicone rubbers can also meet CHEMICAL
RESISTANCE
requirements
in
elevated
temperature applications.
Table 16J
shows the effect of a variety of materials
on a low compression set silicone compound after
one week’s immersion at 77
°
F. At elevated
temperatures, organic rubbers loose their
effectiveness to resist these types of chemicals,
and begin to break down.
Note:
The figures for volume and durometer
change, can help determine the suitability of
silicone rubber, in your application
THERMAL CONDUCTIVITY
compared to most
other elastomers, silicone rubber has a high
thermal conductivity. Values range 0.330 to 0.515
x 10
3
gr-cal/sec/cm
2
/cm/°C
ADDITIONAL THERMAL PROPERTIES:
Thermal expansion- the coefficient of volumetric
thermal expansion for silicone rubber is in the
range of 5.9 to 7.9 x 10
-4
/°C. The linear coefficient
of thermal expansion is roughly one-third of the
volumetric coefficient of thermal expansion, and
can be used to calculate the total linear thermal
expansion of a silicone rubber part over a
temperature range.
RADIATION RESISTANCE:
The ability of
silicone rubber to resist radiation damage at
normal Temperature is comparable to many other
synthetic polymers. However, at temperatures
extremes, silicone rubber offers a combination of
thermal, oxidation, and radiation resistance
superior to most polymers.
RELEASE CHARACTERISTICS:
Silicone rubber
provides better release from sticking than any
other rubber. One example of an application
utilizing these release properties is the use of
silicone rubber for rollers used in processing sticky
materials such as hot polyethylene and adhesive.
MATERIAL
WEIGHT
CHANGE %
VOLUME
CHANGE %
DUROMETER
CHANGE %
ACIDS
Nictric conc.
+10
+10
-30
Nictric 7%
<1
<1
-2
Sulfuric conc.
*
Disintegrates
*
Sulfuric 10%
<1
<1
-2
Acetic conc.
+2
+3
-4
Acetic 5%
+4
+4
+8
Hydrochloric conc.
+1
+1
-6
Hydrochloric 10%
+2
+4
-4
Hydrochloric 3%
<1
+1
-2
BASES
Sodium Hydroxide 20%
<1
<1
-2
Sodium Hydroxide 1%
<1
<1
-4
Ammonium Hydroxide conc.
+2
+2
-4
Ammonium Hydroxide 10%
+3
+2
-6
SALTS
Sodium Chloride 10%
<1
<1
-2
Sodium Carbonate 2%
<1
<1
0
SOLVENTS
Ethal Alcohol
+5
+6
-10
Acetone
+5
+15
-15
Toluene
+75
+120
-30
Gasoline, Regular
+65
+130
-25
Gasoline, Aviation
+60
+110
-30
Mineral Spirits Carbon
+65
+110
-30
Tetrachloride
+130
+110
-25
HYDRAULIC FLUIDS
Hollingshead H-2
+4
+5
-10
Hollingshead H-2 (1)
+9
+12
-15
Skydrol
+4
+4
-8
Skydrol (1)
+7
+8
-10
PRL3161
+5
+7
-8
PRL3161(1)
+9
+9
-15
OILS
Castor Oil
<1
<1
-4
Lard Oil
<1
<1
-4
Linseed Oil
<1
<1
-2
Mineral Oil
+5
+6
-6
ASTM # 1 Oil (2)
+3
+5
-6
ASTM # 3 Oil (2)
+20
+31
-20
Silicone Oil SF 96 (100) 2
+25
+35
-25
Silicone Oil 42,000 cstk (2)
+9
+10
-12
OTHER
Water
<1
<1
<1
Hydrogen Peroxide 3%
<1
<1
<1
Pyanol 1476
+4
+4
-8
TABLE 16J CHEMICAL RESISTANCE- SILICONE RUBBER
(1) 70 hours @ 212ºF (2) 70 hours @ 300ºF