436 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Society of Cosmetic Chemists Award Sponsored by Shaw Mudge and Co. The 1973 Society of Cosmetic Chemists Award sponsored by Shaw Mudge & Co. has been presented to Dr. Alexander A. Fisher, New York University Medical Center, for his work on contact dermatology. The award, consisting of a scroll and a $1000 honorarium is presented annually to the author or authors for outstanding contributions to safety in the use of toiletry and cosmetic products. Formal presentation was made by Miss Rosemarie Wallisch, 1974 Seminar Chairman, at the May 9, 1974, luncheon session during the Society's Seminar at Chicago, Illinois. ß . :'.':%'.:..':'..:.'::'::.•.'.'.:-:i:.':'•o. ' : .' .' .:•.•:•::..: :.: :.•'::.'•i•':•::.':.•.•:• :: :.:•: ,•:::.:•:*',•:::':::'.:%.•'::" .• :.':•::.::.•:..'•.' ":':'..:...'."•..:.•:'•':-.:".::::::.::.'.'..'.-• •. • ':• •' •'• :.: ...• .•...•:.:•:.:..: • :...' .... .i" - • . . ?"•'•:•'• ...?•.: '"' • • ß .: - "':•" •'"' "::':-' •'" '::'•"""•' •':' 'i.• ...11:i: •"•'"' ':•i ..•: .... : •.y. :'• . •... . •.•:" ,.:• •..'.:•2• •, • Le• to right: SCC President Dr. Hyman Henkin, Award Recipient Dr. Mexander A. Fisher, and Seminar ChM•an Miss Rosemarie WaHisch

]. Soc. Co met. Chem., 25, 437-454 (August 1974) Application of Rheological Studies to Product Formulation, Stability, and Processing Problems JOHN B. WARD, Ph.D., JAMES F. KINNEY, M.Sc., and HOSNY Y. SAAD, Ph.D.* Presented May 3, 1973, Seminar, Cinncinnati, Ohio Synopsis-The PHYSICAL CHEMICAL PRINCIPLES involved in RHEOLOGICAL MEASUREMENTS are briefly reviewed. Instrumentation including the Brookfield Vis- cometer, the Brookfield with Helipath, the Brookfield Plate and Cone Viscometer, and the Rotovisco Viscometer is discussed. Comparative data are presented for typical lotion, cream, and suspension products as measured with each of these instruments. The prac- tical application of such data to FORMULATION, STABILITY, and PROCESSING studies is illustrated. The interpretive meaning of the mathematical equations governing this phenomenon and their application in achieving the desired effect are also discussed. INTRODUUTION The word "rheology" was first recognized in the work of Bingham and Crawford circa 1929 (1). The first Society of Rheology was founded in Amer- ica in that year. In the ]ate 1940's, scientists were still debating if "rheology" was the proper word to define the study of deformation and flow of matter. This brief insight into the history of this science is offered to illustrate the newness of the field. Scott-Blair first directed the attention of pharmaceutical scientists to this new area in 1945 when he published an article in the Pharmaceutical Journal entitled, "Rheology and the Pharmacist" (2). This worker remained active in the field for over 20 years. His thesis in all of his work was to relate that prop- erty which consumers define as "feel" to scientific measure. One of his maior contributions was the publication of a dictionary of terms used in rheology (3). *Product Development Department, Avon Products, Inc., Suffern, N.Y. 10901. 437