Chlorine-containing resists

Their performance falls short of most present finishes, particularly in durabiUty, resistance to chlorine-containing bleaches, and formaldehyde release, and they are not used much today. Both urea and formaldehyde are relatively inexpensive, and manufacture is simple ie, 1 —2 mol of formaldehyde as an aqueous solution reacts with 1 mol of urea under mildly alkaline conditions at slightly elevated temperatures. 

Other polyethers The chlorine-containing polyether Penton has excellent resistance to mineral acids, strong alkalis and most common solvents. It is not recommended for use with oxidising acids such as fuming nitric acid. 

Viton hoses were instead selected for the feed brine to the electrolysis cells. These are chemically resistant to chlorine-containing brine. There are several specifications of Viton hose available. For working with brine in an electrolysis environment, special attention had to be given to rupture resistance of the hoses with respect to operator safety. 

Selection of materials of construction with satisfactory corrosion resistance for the auger and air preheater—the test report indicates that the auger corrosion appears related to the chlorine contained in shredded DPE suit material (Parsons, 2001). 

TAGAWA Main Reactions of Chlorine- and Silicon-Containing Resists... 

Finishes with KAURIT KFN are resistant to dry cleaning and to washing at temperatures up to about 60C. Chlorine-containing detergents must be avoided. 

Theory of Chlorine Substitutions, The first fact which struck me in these substitutions, was the stable condition of equilibrium of the halydes I perceived these molecular groups reappear incessantly, from the midst of the successive transformations of the first term I perceived these groups, however great the quantity of chlorine th contained, resist, contrarily to all previous experience, the action of alkalies. 

Chlorine-containing rubbers based on the polymerisation of chloro-prene [reaction (1.4), R = Cl] are speciality polymers with good resistance to organic solvents and chemical reagents. Nitrile-butadiene rubber (NBR) has similar properties and is obtained by randomly copolymerising acrylonitrile with butadiene ... 

Corrosive wear also occurs in non-filled polymers well-known examples are fluoro-polymers and chlorine containing polymers, such as HPFA and PVC. Fluoropolymers have a tendency to form hydrofluoric acid at high temperatures in combination with air and moisture. PVC tends to generate hydrochloric acids at elevated temperatures. The corrosion problem is generally more severe with rigid PVC than with flexible PVC. With polymers like these, the metal parts in contact with the polymer should be made out of a corrosion-resistant metal, such as Hastelloy, 17-4 PH, 15-5 PH, etc. 

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