THE HIGHS AND LOWS OF ENGINE LUBRICATION - PART 3: High Temperature, Low Shear Rotational Viscometry of Engine Oils

1987 ◽  
Author(s):  
M.C. Peoples ◽  
R.E. Mansell ◽  
T.W. Selby
Keyword(s):  
High Temperature ◽  
Engine Oils ◽  
Rotational Viscometry ◽  
Low Shear

A Novel Fluorocarbon Elastomer for High-Temperature Sealing Applications in Aggressive Motor-Oil Environments

1990 ◽  
Vol 63 (4) ◽  
pp. 516-522 ◽  
Author(s):  
W. M. Grootaert ◽  
R. E. Kolb ◽  
A. T. Worm
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Automotive Industry ◽  
Corrosion Inhibitors ◽  
Vinylidene Fluoride ◽  
Motor Oil ◽  
Aging Behavior ◽  
Lubricating Oils ◽  
Engine Oils ◽  
Operating Temperatures

Abstract The tendency in the automotive industry to use smaller engines has resulted in a situation where lubricating oils are exposed to higher operating temperatures. This is especially the case in countries where there is no restriction on highway speed. Amine-based additives present in the oils (e.g., as dispersants and corrosion inhibitors) tend to slowly attack the conventional fluorocarbon elastomer seals under these conditions. As a result of that attack, the seal becomes brittle and eventually fails. A novel fluorocarbon elastomer of vinylidene fluoride, tetrafluoroethylene, and propylene has shown excellent aging behavior in the laboratory toward many aggressive engine oils at elevated temperature. Its improved resistance as compared to conventional fluorocarbon elastomers is attributed to the replacement of hexafluoropropylene with propylene.

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