NEW PRODUCTS
FOR DTA 5œ «rn « ζ EQUIPMENT TO MAKE ω THERMOGRAMS ο LIKE THIS, 2ce 05 YOU CAN PAY xωza •Ox UP TO $35,000 oζ o
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SAMPLE WEIGHT REFERENCE HEATING RATE TEMP. RANGE THERMOCOUPLE... RECORDER
NH,NOj 103 mg Alumina 10· C/min 25"-350'C Chromel-Alumel liti»
DECOMPOSITION '
Rhombic II to Rhombic 1 Rhombic I to Tetragonal
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Tetragona! to Cubic CRYSTAL INVERSIONS
High shear rate, gas operated rheometer features improved temperature control and improved closure using an O-ring made of Teflon. The equipment is used for flow rate studies in the non-Newtonian ranges of high shear polymers and is suitable for research or quality control. The desired temperatures can be reached in less than 1 hour and controlled to within 0.5° C. Temperature recovery after loading a new sample takes 15 minutes. The rheometer is gas (nitrogen) pressurized to provide constant shear rates throughout the run. The carbide extrusion die (ASTM D-1238-57T, 1.048 mm. diameter X 8.00 mm. long) can be quickly removed and replaced. Carbide dies of other sizes can be furnished for the standard extruder body. Pressure Products Industries, Inc., Hatboro, Pa. 429 Cryostat The Cryojet is a variable temperature cryostat which provides an operating range of 4.2° to 400° K. and may be operated from any cryogenic storage container. The Cryojet features a high refrigeration capacity with efficient cryogen consumption. At 20° K. the apparatus will dissipate 3 watts with less than a 1-liquid-liter-per-hour helium consumption. A temperature of 4.2° K. can be obtained from ambient in less than 10 minutes using only 0.6 liquid liter of helium. The entire operating range can be covered with liquid nitrogen or helium ; no flammable fluids are needed and the Cryojet may be vented directly to the laboratory atmosphere. A variety of special tails and accessories are available. Magnion, Inc., 144 Middlesex Turnpike, Burlington, Mass. 430
COMPOUND MELTING
TEMPERATURE -y
FISHER'S NEW AUTOMATIC DTA SYSTEM COSTS LESS THAN $1,000
At $950, Fisher's new Model 260 Differential Thermalyzer™— programmer, furnace and sample holder—is priced far below the elaborate micro-DTA systems. Used with a 1-mv recorder, it can plot the thermal "fingerprints" that identify impurities in pharmaceuticals . . . analyze clays or ceramics . . . differentiate between different types of coal, soils or isomers . . . test polymer curing behavior. The programmer feeds power to the furnace, heating the samples at a uniform 5 ° , 10° or 25 °C per minute, while differential thermocouples plot the thermogram. You can run two 50-200 mg samples simultaneously, heat them to 5 0 0 ° or 1200°C, record temperature changes as small as 0.25°C. We'll be glad to send you a pair of bulletins that describe the Thermalyzer and illustrate what it can do. Just write Fisher Scientific Company, 1 0 0 Fisher Building, Pittsburgh, Pa. 15219. J«4
FISHER SCIENTIFIC CO. Instruments, Apparatus, Furniture and Chemicals for Laboratories Complete stocks In all these locations: Atlanta · Boston · Chicago · Cleveland · Houston · New York Philadelphia · Pittsburgh · St. Louis · Union, N. J. · Washington · Edmonton · Montreal · Toronto · Vancouver "See Laboratory Guide for all Products/Sales Offices" Circle No. 33 on Readers' Service Card VOL. 38, NO. 9, AUGUST 1966 115 A
