Gelest Silicone Fluids - Gelest Inc.

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Gelest, Inc.
Mechanical
Coefficient of adiabatic compressibility
1.10x10 -10 cm 2 /dyne
Volume reduction of 100 cSt. fluid
CH3
CH3
CH3
at 1,000 psi 0.70-0.75%
at 10,000 psi 5.50-5.90%
at 20,000 psi 9.00-9.20%
CH3
Si
CH3
O
Si
CH3
O
n
Si
CH3
CH3
at 40,000 psi 13.30-13.80%
Molecular Weight
Viscosity, µ, of Polydimethylsiloxanes as a function of a degree
of polymerization “n”.
100,000
Note: The straight portion of the slope corresponds to A.J.
Barry’s relationship on molecular weights>2,500:
VISCOSITY at 25°C. cSt
10,000
1,000
100
log µ cSt
= 1.00 + 0.0123M 0.5 n
MOLECULAR WEIGHT (Calculated)
1
5 10 20 30
40
10
1
162
2,000 5,000 10,000 50,000
100,000
Optical
Refractive index, 25°C 1.397-1.404
Verdet constant of
16.2-16.9x10 -3 mm/gm/cm
magnetic rotary power
Radiation Resistance
10,000
Effect of Gamma Radiation
on Viscosity of Silicone Fluids
25°C
VISCOSITY at 25°C. cSt
1,000
100
0
200°C 150°C
DMS-T31 Polydimethylsiloxane
200°C 25°C
150°C
PMM-0025 Polymethylphenylsiloxane
200°C
150°C
PMM-5021 Dimethyl-Phenylmethylsiloxane copolymer
10
Radiation dose(megarads)
100
25°C
(215) 547-1015 FAX: (215) 547-2484
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