Dentifrice abrasion instrument tests abrasiveness of polishmg agents used in toothpastes and powders. Regular stiff nylon toothbrushes in a slurry of the polishing agent, i.e.,
CaHP0 4 .2H 2 0 with 5 0 0 0 and 10,000 strokes are used against test materials such as antimony or copper Weight loss of metal is correlated with the abrasiveness
LABORATORY
Victor's
Applied Research Center
Windowless walls, fifteen inches thick, and a roof over ten inches deep house the Victor Chemical Division's Applied Research Center built two years ago a t Chicago Heights, 111. The laboratories are heated and air conditioned b y a modified heat p u m p . T h e wall construction minimizes t e m p e r a t u r e variation and allows good control over ventilation and light. A heat p u m p operates by evaporating, compressing, and condensing a refrigerant. I n winter heat is collected and used from exhaust air; in summer by using a different circuit heat is stripped from incoming air rather t h a n exhaust air. Additional heat is supplied by electrical resistance heaters. T h e k e y t o t h e maximum utilization of heat is t o circulate air continuously t h r o u g h the building. The present building houses the A p plied Research Center and the offices of the Research Director. Two wings are planned which will eventually accommodate the library and organic and inorganic research facilities. T h e Victor Division of the Stauffer
OF THE MONTH Chemical C o m p a n y specializes in prod^ ucts which are based on phosphorus including food grade phosphates used a s leavening agents and industrial grade heavy chemicals used as builders in synthetic detergents; t h e company is one of the two principal suppliers of polishing agents for dentifrice m a n u facturers. A recently introduced leavening agent, sodium aluminum phosphate, used for self-rising flours, was developed a t t h e Applied Research Center. About 3 0 % of Victor's products go into food, while the remainder are industrial chemicals. Of current interest a t Victor is a study of t h e interaction of proteins and phosphates as it relates to molecular weight. This information is i m p o r t a n t in t h e emulsifioation of fats in meats and cheeses. The company is also working on organophosphorus compounds for pesticides. D r . L. E . Netherton, Director of R e search, stressed the company's awareness t h a t nearly all of i t s products find their way into the home. VOL. 3 4 , N O . 13, DECEMBER 1962
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87 A
Laboratory of the Month
After electrophoretic separation of proteins on strips of cellulose acetate, the relative amounts of each protein are measured by spectrophotometry. This equipment is used to determine the effects of phosphates in altering proteins such as albumin, casein, and whey protein. The interaction of phosphates and proteins is important in foods such as baked goods, process cheeses, and meats
Paper chromatography is used rou tinely for the simultaneous qualita tive and quantitative determination of condensed phosphates. This method is used on all phosphates and prod ucts containing phosphates
Apparatus shown measures ratio of open cells to closed cells in rigid polyurethane foams. A block of foam of specified dimensions is placed in the apparatus and a slight vacuum is ap plied. The air volume displaced by the foam sample represents the space occupied by the closed cells plus the cell walls. Specimen weight divided by the specific gravity gives the vol ume of the foam solids and of en closed cells in the specimen SS Α
•
ANALYTICAL CHEMISTRY
WACO REFRIGERATED
BATH
Controlled Cooling and Heating Minus 10° C to Plus 65° C
Amylograph measures the rate of thickening of starch or flour with increasing temperature. The continuously recording chart is shown being adjusted to zero before starting the automatically controlled heating cycle
• WIDE RANGE Visibility bath with BOTH mechanical refrigeration and heating. Provides constant temperature from minus 10° C to plus 65° C using 10" of liquid in a 16" uninsulated Pyrex jar. Using less liquid minus 20° C is obtainable. β SENSITIVITY Mercury Thermoregulator and a WACO Thyratrontube Relay controls operation of the compressor and heating until within plus or minus .01 ° C.
Victor's Applied Research Center features windowless walls. Heat and air conditioning are supplied by a modified heat pump. Fifteen-inch walls and teninch deep roof conserve heat and minimize outside temperature effects
Rate of reaction apparatus measures the rate of C 0 2 gas ing system. A bomb containing the sample is placed perature water bath. Rate of C 0 2 released is recorded phosphate and the new sodium aluminum phosphate agents in baked goods
ALREADY USED FOR—Viscos ity vapor pressure and other physi cal data determination, organic syn theses, ASTM petroleum tests, etc. Also as COOLANT CIRCULATING SYSTEM for spectrophotometers, refractometers, distillation condens ers.
released from a leaven in the controlled tem on disk. Calcium acid are used as leavening
NO. F882 WACO LO-TEMP REFRIGERATED BATH with Pyrex jar 12" diameter. For 115 volt 50/60 cycle AC. $390.00
• Other sizes and many acces sories available to fit your needs. Please write for WACO BATH BUL LETIN E-8 for complete information. LABORATORY SUPPLIES AND EQUIPMENT
WlLKENS-ANDERSON CO. 4525 W . D I V I S I O N ST.
C H I C A G O 5 1 , ILL.
Circle No. 18 an Readers' Service Card
VOL.
34, NO. 13, DECEMBER 1962
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89 A
