Redwood viscometer

This empirical method is used in Europe but has little use in North America. Like the Saybolt method, this method measures the time for a fixed volume to flow out of a standard Redwood viscometer by the IP70 procedure and the result is reported in Redwood seconds. [Pg.24]

The Redwood viscometer is considered to be the first efflux viscometer developed, designed in the late 1800s by Redwood, and, after some modification, is still in use. The test procedure may be carried out according to CEN EN 16345 (2012). [Pg.185]

A modification of the Ostwald viscometer is the Redwood viscometer, used for very viscous liquids. This viscometer consists of an open cup, through the centre of the base of which is an accurately bored hole fitted with a valve. The cup is filled to a given mark with liquid, the valve is opened, and the time taken for a given volume of liquid to discharge is noted. [Pg.161]

Fi(. 4.1 Viscosity-temperature curves for the standards (L H ) and the oil under test (U) 4.2.1 Determination of viscosity of the given oil with Redwood viscometer... [Pg.85]

Redwood viscometers are available in two sizes — No. 1 (Universal) and No. 2 (Admirality). The two viscometers, RWl and RW2, are identical in principle, shape and method of testing a sample. The difference lies in the dimensions of die dischaige capillary (tube/jet/orifice) ... [Pg.87]

What is the minimum Efflux Time (Flow lime or Discharge time) recommended for (Redwood) Viscometers ... [Pg.89]

Flow through a porous cell has been used in the viscometry of mobile liquids. The older types of viscometer used in testing lubricating oils, such as those of Redwood, 3 Engler, etc., in which a liquid flows through a small hole in the bottom of a vessel, have no scientific interest, and are being replaced by instruments of the type described above. [Pg.82]

Although it is considered a technical advantage to specify kinematic viscosity, the conventional viscometers are still in wide use and it may be convenient, or even necessary, to be able to convert viscosities from one system to another. Provision is made (ASTM D-2161) for the conversion of kinematic viscosity to Saybolt Universal and Furol viscosity and (in IP standards) for conversion to Redwood viscosity ... [Pg.240]

CEN EN 16345. 2012. Bitumen and bituminous binders - Determination of efflux time of bituminous emulsions using the Redwood No. II viscometer. Brussels CEN. [Pg.168]

Flow Cup. An orifice-type viscometer, of which there are several patterns ford, redwood, saybolt, zahn. [Pg.127]

Red Ware. See Rockingham ware. Redwood Cup. An orifice-type viscometer. See flow cup. Redston-Stanworth Annealing Schedule. A procedure for determining the optimum conditions for annealing small glass articles it is based on the Maxwell model of stress release, modified to take account of the variation of viscosity with time. (G. D. Redston and J. E. Stanworth, J. Soc. Glass Tech., 32,32,1948.)... [Pg.256]

It Is unfortunate that the description of his viscometer, and the emphasis on laminar flow appeared too late to Influence Redwood, Eagler and Saybolt who designed orifice viscometers In the mid 1880 s. (Ref. 4 Chapter 2). [Pg.4]

Figure 23 (a) Effect of adding soy lecithin [initial viscosity of plain chocolate (cocoa butter content, 34.8%), >200 s] on the viscosity of chocolate, (b) Fat and lecithin contents of chocolate of identical viscosity (42 s). (c) Effect of adding soy lecithin to suspensions of ( ) cocoa butter and (A) ground sugar in cocoa butter on viscosity. Viscosity was measured at 50°C on Bournville Redwood-type viscometer. [Pg.304]

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