CHEMICAL C O M M E N T S
FROM THE DOW LIBRARY OF SPEÇIAL CHEMICALS Methocel Licks Important Problems in the Leather Industry Coating the grain surface of chromeand 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. 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 penetration is reduced. Addition of small amounts of glucose further assists in the removal of the Methocel from the dried leather.
Caproic Acid STRUCTURAL FORMULA: CH3.CH2.CH2.CH2.CH2.COOH MOLECULAR FORMULA: C 6 H 1 2 0 2
Perchloroethylene V a p o r — Cleans M e t a l Parts
MOLECULAR WEIGHT: 116.2 S Y N O N Y M : Hexanoic Acid. PROPERTIES: Slightly y e l l o w liquid w i t h a strong goatlike odor. Specific gravity at 2 5 / 2 5 ° C
0.929
Freezing point
— 7.2° C.
Refractive index at 25° C
1.417
SOLUBILITY at 2 5 ° C : Acetone
00
Benzene
00
Carbon Tetrachloride
00
Ether
00
Methanol
00
V . M . P . Naphtha
00
Water
Insoluble
Caproic
A c i d is another item from
the voluminous Library of
Special
C h e m i c a l s b e i n g c r e a t e d by Dow a s the result of its continuing
program
of extensive
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 Perchloroethylene allowing the vapor to condense on the cold metal to dissolve grease and flush away lint and chips. Perchloroethylene is nonflammable, 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 preparatory to plating. Degreasing surfaces with this solvent prevents blistering and peeling of platings.
Jacketed Kettles that Cook with Dowtherm Multi-purpose kettles constructed for the laboratory or semi-plant use Dowtherm, a heat transfer medium developed by Dow. Such kettles are built with the jacket bottom enlarged to accommodate a small quantity of water, Dowtherm Ε or Dowtherm 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 pounds per square inch.
50th
Anniversary
1897-1947
research.
S a m p l e s of Caproic A c i d a n d d a t a sheets on the
Dow
product a r e a v a i l a b l e on request. THE D O W CHEMICAL C O M P A N Y
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