334 TABLE 335.— VISCOSITY OF OILS 128 



The SAE viscosity numbers constitute a classification of crankcase lubricating oils in 

 terms of viscosity only. Other facts of oil quality or character are not considered. 



Part 1. — Crankcase oil classification 



SAE recommended practice 



SAE 



viscosity 

 number 



10 

 20 

 30 

 40 

 50 

 60 

 70 



Viscosity range, Saybolt univ., sec 



Min. 



80 

 105 

 125 



At 210° F 



Max 



Less than 80 



" 105 



" 125 



" 150 



Part 2. — Automotive Manufacturers' viscosity classification 



SAE general information 



Viscosity 

 number 



10VV 

 20W 



Viscosity range at 0°F, Saybolt univ., sec 



Min. 



6,000 

 12,000 



Max. 



12,000 

 48,000 



128 SAE Handbook, 1949 ed., p. 580, Soc. Automot. Eng., New York. 



TABLE 336.— EFFECT OF PRESSURE UPON VISCOSITY" 9 



Absolute Relative viscosity 



Temper- viscosity Pressure in kg/cm2 



ature at 1 atm , * 



Substance °C centipoises 1 1000 4000 8000 



i-Pentane 30 .198 1.0 2.208 7.834 26.98 



75 — .662 1.560 5.188 15.10 



Acetone 30 .285 1.0 1.683 4.027 9.705 



75 .785 1.297 2.786 5.781 



CS* 30 .352 1.0 1.445 3.228 6.918 



75 .750 1.125 2.355 4.688 



Sulfuric ether 30 .212 1.0 2.109 6.194 18.24 



75 — .755 1.409 3.990 9.683 



Petroleum ether 30 — 1.0 1.995 8.51 38.9 



80 — — — 3.63 11.5 



Kerosene 30 — 1.0 2.88 5.13 — 



80 — — — 8.13 75.9 



Water 1.792 1.0 .921 1.111 freezes 



10.3 1.297 .779 .743 .842 1.152 



30 .801 .488 .514 .658 .923 



75 .380 .222 .239 .302 .445 



100 .284 — — — — 



Mercury 30 1.516 1.0 1.023 1.097 1.202 



75 1.340 .884 .883 .880 .877 



129 Bridgman, P. W., The physics of high pressure. Macmillan, New York, 1931. 



12,000 

 88.51 



38.55 



10.74 

 15.45 

 8.83 

 46.77 

 20.46 

 151.4 

 30.9 



631 



1.206 



1.324 

 .876 



SMITHSONIAN PHYSICAL TABLES 



