Is it a rice paddy? Nothing so earthy. It's the familiar test-tube brush. Did you guess it? Now let's get a new perspective on something else you're familiar with: FREON® fluorocarbons. You know FREON as a refrigerant, propellant, solvent . . . maybe as a fire-extinguishing agent or chemical intermediate. But what else can FREON do? Maybe something new that you might discover . . . to solve a problem. Or to create a new product or process. There are 25 different FREON fluorocarbons —each with a specific boiling point from —198.4°F. to +360°F. And each has a unique combination of the following basic properties: High Chemical Stability. Chemically inert to most construction materials,
chemical reagents, fuels and oxidizers. High Thermal Stability. Withstands up to 600°F. with continuous exposure to steel and copper. High Dielectric Strength. Breakdown voltages of about 100 kilovolts/inch. High Density. From 1.175 to 2.148 g/cc at 86°F. for liquids; from 4.57 to 9.65 g/liter of saturated vapor at the boiling point. Low Toxicity. FREON compounds are relatively non-toxic. Low Surface Tension. At room temperature, less than 20 dynes/cm. Low Specific Heat Ratios. From 1.06 to 1.2. Low Viscosity. At 86°F., less than 0.7 centipoise in liquid f o r m ; less than 0.017 centipoise in vapor form. Selective Solvency. Dissolves organic
Recognize this? An imaginative new look at something familiar can leadto surprising results!
soils without affecting metals, plastics, elastomers or coatings. Rapid Heat Transfer. Ideal for cooling by either convection or boiling. Non-flammability. Can be added to flammable chemicals to form non-flammable mixtures and azeotropes. Immiscibility with Water. Solubility no greater than 0.060% at 32°F. For specific information write to Du Pont Co., Room 4906 Wilmington, Delaware 19898. fluorocarbons
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Better Things for Better Living. . through Chemistry
