CHEMICAL COMMENTS
NEW and COMPLETE! A source of technical information to aid you in planning future products
Methocel Licks Important Problems in the Leather Industry Coating the grain surface of chrome- and vegetable-tanned leathers with Methocel before they are pasted on frames for drying reduces shrinkage. The use of Methocel also gives added smoothness in grain, and results in a gain in surface area. Using either the 1500 or 4000 cps. types, thick pastes can be produced with a minimum amount of Methocel, making possible added economy, and easier removal from the hide since pene tration is reduced. Addition of small amounts of glucose further assists in the removal of the Methocel from the dried leather.
Perchloroethylene VaporCleans Metal Parts Vapor degreasing with Perchloroethylene is an economical method of cleaning metal parts before assembly or in preparation for other operations. The parts to be cleaned are suspended above a bath of Perchloroethy lene allowing the vapor to condense on the cold metal to dissolve grease and flush away lint and chips. Perchloroethylene is non flammable, stable and has high solvency for oils, waxes and a majority of the die lubricants used in casting and stamping. It is also used in liquid phase operations and is especially adapted to cleaning metal pre paratory to plating. Degreasing surfaces with this solvent prevents blistering and peeling of platings.
Jacketed Kettles that Cook with Dowtherm
Describes the Chemistry, Physical Properties and Commercial Uses
Multipurpose kettles constructed for the laboratory or semiplant use Dowtherm, a heat transfer medium developed by Dow. Such kettles are built with the jacket bot tom enlarged to accommodate a small quantity of water, Dowtherm Ε or Dow therm A. This pool of liquid can be heated with electric or gas heat to provide vapor for heating the kettle. The unit is operable at temperatures ranging from 200° F. to 700° F., with corresponding pressures not exceeding 125 lb. per sq. in.
Write today for this interesting and attractive new book giving complete information about Dow Glycols. Commercial uses of each of these versatile materials are explained in detail. A thorough discussion of physical properties, chemistry and technical information, amply supported by charts and graphs,
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