Page 312 - The Tribology Handbook

c3 Synthetic oils

Application data for a variety of synthetic oils are given in the table below. The list is not complete, but most readily
available synthetic oils are included.
Table 3.1

Typical Chlorinated
Inhibited Qpical Typical Phenyl Phenyl Polyglycol Pe$uorinated
Di-ester Phosphate Methyl
Proper@ Esk? Silicone Methyl Mcfhyl (inhibifcd) Pohethm
Siliconc Siliconc
~
Maximum temperature 250 300 I IO 220 320 305 260 370
in absence ofoxygen ("C)
Maximum temperature 210 240 I10 180 250 230 200 310
in presence ofoxygen ("C)

Maximum temperature due I50 180 100 200 250 280
to decrease in viscosity ("C)
__
Minimum temperature due -35 -65 - 55 - 50 - 30 - 65 - 20 - 60
to increase in viscosity ("C)
Density (g/ml) 0.91 1.01 1.12 0.97 1.06 I .04 1.02 1.88
Viscosity index 145 140 0 200 175 195 160 100-300

Flash point ("C) 230 255 200 310 290 270 180

Spontaneous ignition Low Medium Very high High High Very high Medium Very &$
temperature

Thermal conductivity 0.15 0.14 0.13 0.16 0.15 0.15 0.15
WtM "C)
Thermal capacity fJ/kg"C) 2000 1700 1600 1550 1550 1550 ZOO0
Bulk modulus Medium Medium Medium Very low LOW Low Medium Low

Boundary lubrication Good Good Very good Fair but poor Fair but poor Good Verygood Poor
for steel on for steel on
steel steel
Toxicity Slight Slight Some Non-toxic Non-toxic Non-toxic Believed to Low
toxicity be low
Suitable rubbers Nitrile, Silicone Butyl, Neoprene, Neoprene, Viton, fluoro- Nitrile >[an\
silicone EPR viton viton silicone

Effect on plastics May act as plasticisen Powerful Slight, but may Slight, but may Slight, but may Generally hiild
solvent leach out leach out leach out mild
plasticisers plasticisen plasticisers
~ ~~
Resistance to attack Good Good Fair Very good Very good Good Good Very good
by water
Resistance to chemicals Attacked by Attacked by Attacked by Attacked by Attacked by Attacked by Attacked by Very good
alkali alkali many strong alkali strong alkali alkali oxidants
chemicals

~~
Effect on metals Slightly Corrosive to Enhance Non-corrosive Non-corrosive Corrosive in Non- Removes oxic
corrosive some non- corrosion presence of corrosive films at
to non- ferrous in presence water to elevated
ferrous metals of water ferrous metals temperatur
metals when hot
Cost (relative to 4 6 6 15 25 40 4 500
mineral oil)

C3.1