Freon resistance

ABS with ASA and two SAN copolymers were foamed with a physical foaming agent easy formability, excellent physical properties and Freon resistance Kim and Choi, 1998... 

Semiflexible high-bond thixotropic Rigid high-bond high-flash freon-resistant Baking type epoxy varnish... 

The first and most extensive use of polyvinyl formal is an insulator for electrical wire. A 1943 General Electric patent describes the typical 105 C formulation. Folyvinyl formal resins have since been formulated into many different wire enamel applications. These include solderable enamels, high cut-through enamels. Freon-resistant enamels for hermetically sealed motors, and multicoat magnetic wires for 155-180 C performance.Work to improve wire enamels is contained in Refs. 31-35. 

ACN (> 42%) containing HNBR is used in maximum fuel and oil resistance as well as freon resistance. Low ACN (< 25%) containing HNBR is used for goods that require better dynamic properties (e.g., rolls, belts, and oil field parts). Very low ACN (< 17%) containing HNBR is used for improved low and high temperature/heat buildup resistance goods such as required for arctic oil and gas drilling fields and automatic uses. Typical recipes are... 

Elkassabgi and Lienhard (1988) provided an extensive subcooled pool boiling CHF data set of 631 observations on cylindical electric resistance heaters ranging from 0.80 to 1.54 mm (0.03 to 0.06 in.) in diameter with four liquids (isopropanol, acetone, methanol, and Freon-113) at atmospheric pressure and up to 140°C (252°F) subcooling. They normalized <7 ritsub data by Sun and Lienhard s (1970) saturated q"Tix SL prediction in terms of B,... 

Ethyl sulfate Flammable liquids Fluorine Formamide Freon 113 Glycerol Oxidizing materials, water Ammonium nitrate, chromic acid, the halogens, hydrogen peroxide, nitric acid Isolate from everything only lead and nickel resist prolonged attack Iodine, pyridine, sulfur trioxide Aluminum, barium, lithium, samarium, NaK alloy, titanium Acetic anhydride, hypochlorites, chromium(VI) oxide, perchlorates, alkali peroxides, sodium hydride... 

PEI resists mineral acids, dilute bases (pH less than 9), freons, oils, greases, gasoline, most fuels, certain hydrocarbons and fully halogenated hydrocarbons, most cooking oils and greases, most detergents and disinfectants... 

Various membrane materials are to be compared for corrosion resistance in hydrochloric acid. Membrane samples are ultrasonically cleaned with Freon for 5 minutes and dried at 200°C for 2 hours followed by similar steps of ultrasonic cleaning with demineralized water and drying. The conditioned membrane samples are then immersed in 35% HG solution, making sure that no air bubbles are trapped in pores. The acid exposure at the test temperature (e.g. 25°C) continues for a given period (e.g. one week). The tested samples are ultrasonically washed with demineralized water for 5 minutes and dried at 200°C for 2 hours. The weights of the cleaned membrane samples before and after the acid exposure are compared to assess the relative corrosion resistance of various membrane materials. 

DPIs do not utilize Freon propellants, but use either with or without lactose as vehiculum. These devices have a clinical efficacy similar to standard metered-dose inhalers, but may be easier to use in selected patients, since a minimal inspiratory flow rate is necessary to inhale from a DPI. Therefore, the DPI may be difficult for patients with an insufficient inspiratory flow rate, which occurs in children, the elderly, people with severe COPD shared with diaphragm dysfunction, and during an exacerbation. The inspiratory flow rate is associated with the internal resistance of the device used. For instance the turbuhalor has a significant internal resistance and its delivered dose is dependent from the inspiratory flow rate. 

Extraction using a supercritical fluid (CO2, N20 or CHC1F2 Freon-22) is a well-known process in the food industry (cf. 6.1). Extractors used for analytical purposes operate on the same principle. They incorporate a highly resistant tubular container into which the sample is placed (in solid or semi-solid form) with the supercritical fluid. Two modes of operation are employed ... 

Other halogenated solvents resistant to oxidation, such as CH2C12 or Freon 11 (CCI3F), can also be employed. 

The ingredients for polyurethane flexible foam are Freon 11, polyether polyol-triol, polyurethane and TDI. Polyurethane fire-resistant rigid foam is produced from Freon 11, polyether polyol-hexol, polyether polyol-phosphorus, polyisocyanates and polyurethane. MDI foam has advantages over TDI foam, particularly in that it is easier and safer to handle, and for this reason is widely used as a thermal insulation. Flexible foams account for over 60% of the consumption of polyurethanes31,32. 

Neoprene s resistance to attack from solvents, waxes, fats, oils, greases, and many other petroleum-based products is one of its outstanding properties. Excellent service is also experienced when it is in contact with aliphatic compounds (methyl and ethyl alcohols, ethylene glycols, etc.), aliphatic hydrocarbons, and most Freon refrigerants. A minimum amount of swelling... 

Although tantalum is by far the most widely used of the refractory metals to impart corrosion resistance to chemical-process vessels and components, there are some applications where molybdenum has been used with great success. Molybdenum support structures have replaced graphite in the processing of high-purity alcohols. Molybdenum-rhenium alloys, first developed because of their vastly improved ductility at low temperatures and in the recrystallized condition, have been used as vessel lining and piping components for the manufacture of Freon replacements. ... 

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