STP299

    The Forced-Ball Viscometer and its Application to the Rheological Characterization of Mineral Oil Systems

    Published: Jan 1962


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    Abstract

    Investigation concerning the nature of mineral oils and mineral-oil polymer systems at moderately low temperatures has led to the development of the forcedball viscometer which is capable of precise delineation of the rheological properties of these systems. The gel structures which frequently develop, especially in the presence of some polymeric additives (1), 2 can be systematically and reproducibly degraded by the tech niques available with this viscometer. The forced-ball viscometer easily covers a shear rate range of from 50 to 15,000 reciprocal seconds at viscosities ranging from 20 to 4000 centipoises. Viscosities up to at least 500,000 centipoises can be measured at lower shear rates. The temperature range over which this instrument may be used is limited, in general, only by the bath temperatures that can be maintained. As will be shown, the viscometer is simple in operation and has been found durable and sturdy during several years' use.


    Author Information:

    Selby, Theodore W.
    General Motors Research Laboratories, Warren, Mich.

    Hunstad, Norman A.
    General Motors Research Laboratories, Warren, Mich.


    Paper ID: STP41259S

    Committee/Subcommittee: D02.07

    DOI: 10.1520/STP41259S


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