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DM Fluids |
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Metroark
DM Silicone Fluid |
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Characteristics |
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Metroark DM Silicone Fluid
is dimethyl polysilox-ane, whose
structure, amazing combination
of chemical and physical
properties are dependent on the
presence of the unique
silicone-oxygen-silicone
skeleton. This semi-organic
fluid chemically related to
glass, quartz and the mineral
silicates possesses much of the
stability and good dielectric
properties of this group. |
Available in the form of
crystal-clear liquid of
viscosity from 0.65 to 2.5
million centistrokes, except for
the very low viscosity grades
Metroark DM Silicone Fluid is
serviceable from – 400 to 2000C.
Its service life at high
temperature can be considerably
increased by employment in
closed system out of contact
with air or oxygen. It is
characterised by non-toxicity
and non-irritating, oxidation
resistance, water repellency,
high resistance to permanent
break-down due to shear; uniform
retention of dielectric
properties over a wide range of
temperatures and frequencies,
and long service-life where
conventional organic liquids
fail rapidly. |
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Applications |
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As damping fluids for
damping overload relays,
dashpots, shock absorbers,
ordnance and air-craft
instruments speedometers,
ammeters, gauges, portable
weighing scales, and
perma-nently scaled
torsional vibration dampers
for the crankshafts of
diesel-locomotive engines.
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As hydraulic fluids in
instruments and gauges and
other precision tools and
instruments oper-ated by
fluid pressure.
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As most efficient and
reliable liquid dielectrics
and coolants in
transformers, magnetrons,
capacitors and many other
electrical and electronic
applications. (Use
electrical grade only)
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As excellent lubricant for
rubber and plastic surfaces,
including gears, bearings,
bushings, motion picture
film and photograph records.
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As moisture –repellent
dielectric and lubricant for
clocks, timers, television
tuners and other electronic
devices.
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As ingredients for cosmetic
like hand creams, skin
protections, sun tan
lotions, hair grooming
preparations and
dermatological preparations.
(Use Dimethicone grade only)
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As water-repellent treatment
for glass, ceramic etc.
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Relays,
capacitors,
insulators,
vacuum tubes and
fluorescent
lighting tubes
are made durably
water-repellent
and given better
dielectric
properties under
humid
conditions.
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As a most
efficient
polishing agent
used in most
auto-mobile and
furniture
polishes,
resulting in
polishes that
develop a high
gloss with least
rubbing.
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As coatings and
impregnants for
packings,
diaphrams,
filter cloth and
free flowing
powder.
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As an excellent
release agent in
moulding plastic
and rubber,
non-ferrous
metal die
casting.
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As additive :
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Prevent foaming
in petroleum and
vegetable oils
and many other
non-aqueous
systems;
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Prevent floating
and improve
gloss and
flowout
properties in
paints and
varnishes;
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Increase
abrasion
resistance,
temperature
stability and
weather
resistance in
synthetic
rubbers
especially
neoprene and
G.R.S.;
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Produce more
uniform cell
structure in
urethane foams;
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Aid deareation
of vinyl
plastisol
formulations,
and lubricates
the surface of
the completed
article
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Solubility and
Compatibility |
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Metroark
DM Silicone Fluids are soluble
in hydrocarbon solvents, and in
low molecular weight aromatic
solvents. Limited solubility in
acetone, alcohols, ethers of
glycols and solubility varies
with viscosity. |
Different Viscosities may be
blended to obtain intermediate
Viscosities. |
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Typical
properties of standard viscosity
grade Metroark DM Silcone Fluid |
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Viscosity at 250 C Centistroke |
Flash
Point |
Specific
Gravity
at 250C |
Vics-Temp
Coefficient
** |
Refractive
Index
at 250C |
Boiling
Point
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0.65 |
-10ºC |
0.761 |
0.31 |
1.375 |
990ºC
at 760 mm |
9.9
KV |
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1.0 |
380ºC |
0.818 |
0.37 |
1.382 |
1520ºC
at 760 mm |
12.8 KV |
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1.5 |
630ºC |
0.853 |
0.46 |
1.387 |
1920ºC
at 760 mm |
13.78 KV |
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2.0 |
790ºC |
0.873 |
0.48 |
1.390 |
2300ºC
at 760 mm |
13.78 KV |
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3.0 |
1020ºC |
0.900 |
0.51 |
1.394 |
700C –1000ºC
at 0.5 mm |
13.78 KV |
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5.0 |
1350ºC |
0.920 |
0.55 |
1.397 |
1200ºC
–1600ºC
at 0.5 mm |
13.78 KV |
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10.0 |
1630ºC |
0.940 |
0.57 |
1.399 |
2000ºC
at 0.5 mm |
13.78 KV |
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20.0 |
2320ºC |
0.955 |
0.59 |
1.400 |
2000ºC
at 0.5 mm |
13.78 KV |
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Volatility :
Weight Loss after 48 hrs at 2000ºC |
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50 |
279ºC |
0.960 |
0.59 |
1.402 |
2.5% |
13.78 KV |
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100 |
303ºC |
0.968 |
0.60 |
1.403 |
2% |
13.78 KV |
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200 |
315ºC |
0.971 |
0.62 |
1.4031 |
2% |
13.78 KV |
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350 |
315ºC |
0.972 |
0.62 |
1.4032 |
2% |
13.78 KV |
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500 |
315ºC |
0.972 |
0.62 |
1.4033 |
2% |
13.78 KV |
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1000 |
315ºC |
0.972 |
0.62 |
1.4035 |
2% |
13.78 KV |
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12,500 |
315ºC |
0.973 |
0.61 |
1.4035 |
2% |
13.78 KV |
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30,000 |
315ºC |
0.973 |
0.61 |
1.4035 |
2% |
13.78 KV |
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60,000 |
315ºC |
0.973 |
0.61 |
1.4035 |
2% |
13.78 KV |
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*For Electrical and
electric
applications use
Metroark 50, 100
&/or 200 Dielectric |
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*Viscosity –
Temperature
Coefficient = 1 –
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Viscosity
at 210ºF |
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Viscosity
at 210ºF |
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Typical properties of certain
special purpose fluid |
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Nomenclature |
Viscosity at 250ºC
Centistroke |
Flash
Point |
Specific
Gravity
at 250ºC |
Refractive
Index
at 250ºC |
Volatility Weight Loss after 48
hrs at 2000ºC |
Main Users |
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METROARK DM SILICONE FLUID |
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Do |
1,00,000 |
315ºC |
0.973 |
1.403 |
2% |
Specialised uses in research and
industries |
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Do |
5,00,000 |
315ºC |
0.973 |
1.403 |
2% |
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Do |
10,00,000 |
315ºC |
0.973 |
1.403 |
2% |
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Do |
25,00,000 |
315ºC |
0.973 |
1.403 |
2% |
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Viscosity-Temperature |
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A
comparision of the
viscosity-temperature behaviour
of petroleum oil and `Metroark
DM Silicone Fluid` indicates
that the viscosity of the later
fluid is about 60 times as
constant over the same
temperature span. Over a
temperature range of 1100C the
damping effect of the high
Viscosity“Metroark DM Silicone
Fluid“ decreases in 3:1 ratio
compared with a fall in the
ratio of 2500:1 for petroleum
hydraulic fluid. Accurate
Viscosity of 1,000 to 5,000,000
centistroke grade „Metroark DM
Silicone Fluid“ at the desired
temperature may be determined
with the help of following
equation |
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Log RV = |
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+ |
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+ |
1.004 Log V - 2.447 |
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Where : |
RV
= resultant Viscosity, in
centistrokes, at any
pre-determined temperatures T
V = Viscosity as measured at
250C
T = pre-determined temperature
in centigrade |
Silicone laboratory samples
(SLM) are development
products. Therefore, we
cannot at present give any
binding assurance of
constant properties or of
continuous supplies in
future."
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The data
presented in
this leaflet are
in accordance
with the present
state of our
knowledge, but
do not absolve
the user from
carefully
checking all
supplies
immediately on
receipt. We
reserve the
right to alter
product
constands within
the scope of
technical
progress or new
developments.
The
recom-mendations
made in this
leaflet should
be checked by
preliminary
trials because
of conditions
during
processing over
which we have no
control,
especially where
other companies'
raw materials
are also being
used. The
recommendations
do not absolve
the user from
the obligation
of investigating
the possibility
of infringement
of third
parties' rights
and, if
necessary,
clarifying the
position.
Recommendations
for use do not
constitute a
warranty, either
express or
implied, of the
fitness or
suitability of
the product for
a particular
purpose. |
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