Could you use this kind of detailed information about the polymers you work with Polyethylene Terephthalate Sample Size -- Approx. 1 mg. Heating Rate—15 C/min.
Undrawn Fiber — Without Baseline Compensation — Inert Atmosphere (Nitrogen)
How Superior helps you select tubing with the right corrosion resistance
Now you can get it... with the new DuPont 900 Differential Thermal Analyzer Π For example, in the
thermogram of an undrawn fiber shown above, note how sharply the secondorder transition (Tg) is recorded near 75°C. Following this relaxation of the fiber, crystallization takes place producing the exotherm between 100 and 150°G. Melting of the crystalline polymer is indicated by the well defined endotherm near 250°C. And finally, thermal decomposition of the resin under inert atmos phere produces the complex endotherm above 300°C. D Because sample size can be small—as little as 0.1 milligram—high-speed programming may be employed with no significant loss in resolution. This compact instrument is now commercially available. Π F o r more information about the Du Pont 900 Differential Thermal Analyzer, write t o : E. I. du Pont de Nemours & Co. (Inc.), Instrument Products Div., 2533 N e m o u r s Bldg., A G 563, Wilmington 98, Del. Better Things for Better L i v i n g . . . through Chemistry
DU PONT
Voluminous acid test data accumulated over many years are invaluable in making this choice. They cover the reactions of specific materials to specific corrosive situations or a combination of them. Thus we know that under certain con ditions tantalum and zirconium tubing resist corrosion from hydrochloride acid or that 316 and 20 Cb Stainless Steel alloys resist corrosion from sulfuric acid. And we have similar data on the reactions of various materials to phosphoric, hydro fluoric and nitric acids. Also important is knowing certain specific service condi tions, such as temperature, su rface, acid concentration, degree of agitation and aeration, and whether the solution is alternately reducing and oxidizing. What tubing problems—involving cor rosive media—do you have? Tell us about them. Give us the complete application information and service conditions and we will gladly analyze them and recom mend tubing of the right analysis. Where possible, we will supply samples to en able you to run evaluation tests under actual conditions (we produce precision small diameter tubing in sizes from .010 in. to % in. OD). For prompt action, write Dept. 2504.
Superior Tube The big name in small tubing NORMSTOWN, PA. West Coast: Pacific Tube Company, Los Angeles, Calif. Circle No. 47 on Readers' Service Card 124 A
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ANALYTICAL CHEMISTRY
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