C H E M I C A L S

Hinac Coatings May See Wider Use Pennsalt acquires process for treating metal surfaces, will promote it for general use

Pennsalt has acquired the Hinac proc­ess, a chemical surface treatment which coats metals in a single opera­tion. The process has been available for several years as a mill-applied coat­ing. Pennsalt is introducing it now for general commercial use by metal processors and fabricators.

The Hinac process is a chromate surface treatment which gives coat­ings that resist most acids, alkalies solvents, and oxidizing agents. It was developed by the Heintz division of Kelsey-Hayes. Pennsalt is withhold­ing specific information on athe com­position of the coating, says only that it is a chromate treatment which uses resins.

The Hinac process has three claims to fame, according to Pennsalt: It's easy to apply, has good corrosion re­sistance, and is economical. The coat­ing is applied from an aqueous solu­tion at room temperature by roller coating, dip, or spray. As with most finishing systems, the metals surface must be thoroughly cleaned and rinsed before application. Contact time is only a few seconds, Pennsalt says. The treated metal is cured at 350° to 425° F. Curing time can be as little as several seconds, depending upon the heat source used.

The coating can be applied to any common metal, such as aluminum, zinc, carbon steel, stainless steel, or

magnesium. The treated surface has good weathering properties, resists fading, and retains its gloss, Pennsalt says. The coating can be either clear or colored. Available shades include red, brown, green, blue, black, gray, and bronze.

The company hasn't set prices for the material but says it will be con­siderably less expensive to use than techniques like anodizing. Cost will be reasonable, Pennsalt points out, be­cause of the ease and speed of using the coating.

The company foresees use of the Hinac process for both decorative and protective coatings. While Hinac coatings can be damaged by abrasion, they can be used as a base coat for paint or as an after-rinse for phosphate coatings, anodized surfaces, or electro­plated coatings. Pennsalt will offer three types of Hinac coatings: a clear form which gives weights of 1 to 50 mg. per sq. ft., equivalent to 0.01 to 0.4 micron thickness; a heavier clear coating which gives weights up to 400 mg. per sq. ft.; and colored Hinac which can be applied up to several thousand milligrams per square foot.

BRIEFS

The East German combine Otto Grote-wohl says it has developed a rhenium catalyst that can be used to make gaso­line by cracking medium-heavy oils refined from coal tar. The combine lists two forms of catalyst which it says will yield gasoline with octane numbers from 72 to 74. One catalyst is made from either the metal or solu­tions of its sulfide mixed with fuller's earth previously activated by hydro­fluoric acid. The sulfide is made into solutions containing 1 «to 10 grams per liter of rhenium, Grotewohl says. The other catalyst is a combination of rhenium with molybdenum trioxide. Cracking requires medium to high pressures, the combine adds.

Composition Makes Paint-on Resistors A batch of Du Pont's new resistor composition is applied through a stencil screen onto a ceramic base. The composition, based on glass frit and powdered metals, can be applied to ceramic bases by dipping or brushing as well as with the stencil screen, then fired to develop a durable surface, Du Pont says. Formulation will make resistors hav­ing specific resistances of 500, 2500, and 10,000 ohms per square (length equals width) per mil thickness, and they can be mixed to form intermediate values. Electrical properties are reproducible, the company claims.

Zinc chloride solutions now come in tank car lots from Chemtron Corp., Phillipsburg, N.J. Solutions of tech­nical and hard-fiber grades can be shipped in rubber-lined tank cars or trucks, the company says. C 1

Tetramethylammonium chlorodibro-mide is produced in development quantities at Michigan Chemical, St.

54 C&EN OCT. 31, 1960

Louis, Mich. The orange crystalline solid contains 59% available bromine, releases it in water or other polar sol­vents, the company says. Suggested uses: disinfectant, intermediate in synthesis of brominated compounds.

C 2

Two sodium dispersions come in 1-to 40-lb. quantities from Acton Labo­ratories, Newark, N.J. The two: a 50% dispersion in mineral oil and a mole/mole crushed solids-naphthalene dispersion. C 3

CMC metho p-toluenesulfonate, the salt of l-cyclohexyl-3-[2-morpholinyl-(4)-ethyl]-carbodiimide, has been added to its line of research chemicals by Aldrich Chemical, Milwaukee, Wis. The compound is useful in synthesiz­ing high molecular weight peptides; the urea corresponding to the carbo-diimide is easily separated from the peptides, Aldrich says. C 4

Chemicals and a process for coating carbon steel and stainless steels with copper have been developed by Am-chem Products, Ambler, Pa. The process is nonelectrolytic, deposits thin copper coatings that are uniform and adhere well, Amchem says. Sug­gested uses: coat wires and stampings to reduce abrasion and scratching dur­ing fabrication, form a bonding sur­face for rubber, color code and deco­rate parts. C 5

Three adhesives, from Radiation Ap­plications, Long Island City, N.Y., re­tain their strengths from 600° to 1000° F., the company says. Railseal 100 is an elastomer, based on silicones, that can withstand over 300 p.s.i. shear at 700° F. It is a good sealant or potting compound, the company says. Railseal 200 is a flexible sealant that resists acids, alkalies, fuels, and oxi­dizers. It withstands 50 p.s.i. tension at 800° F., RAI says. Railseal 300 is a structural adhesive, is rigid, and will resist impact. Its useful range is 600° to 1000° F., the company adds. C 6

Further useful information on keyed Chemical items men­tioned is readily available . . .

1 of 130 I m m e d i a t e l y A v a i l a b l e

N a t i o n a l ® I n t e r m e d i a t e s

Pioneer American producer of Aniline, we have also long been major captive users and merchant sellers of Nitrobenzene.

National Nitrobenzene is made in our modern Moundsville, W. Va. plant to meet our own high quality standards. It is low in moisture (0.1% max.), light in color (Barrett Std. 4 max.), 99.7% minimum purity, low in unnitrated paraffins and oxidation compounds. We can make prompt ship­ment in tank cars, tank trucks or 55-gallon drums. Your inquiry is invited.

WRITE FOR NATIONAL ORGANIC CHEMICALS CATALOG

For 65 years National and its predecessor companies have synthesized hundreds upon hundreas of organic intermediates for use in our integrated production of dyes, colors, biological stains, certified food, drug and cosmetic colors.

To indicate the range of National intermediates now available, we have compiled in the National Organic Chemicals Catalog specifications, properties, uses and packaging data on 130 National Intermediates. We will be pleased to send a copy of this Catalog to­gether with our current Price List. Kindly address: Intermediates Department.

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Distributors throughout the world. For information: ALLIED CHEMICAL INTERNATIONAL • 40 Rector St., New York 6, N^Y.

OCT. 31 , 1960 C & E N 55

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