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B••therm WÊÊÊÊÊÊË • •
NEW PRODUCT OF
TRONA RESEARCH
Coatings
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\\Λ3 T h i s newest d e v e l o p m e n t of A m e r i c a n Potash & Chemical Corporation, in conjunction with r e c o g n i z e d paint a u t h o r i t i e s , gives exceptional fire resistant properties to water-base protec tive c o a t i n g s . B O R O T H E R M ,
properly formulated, makes coat ings which meet D e p a r t m e n t of C o m m e r c e S p e c i f i c a t i o n CS-42-49 (Class F ) and Federal Specification SSA-118a for fire resistance. It is especially adapt able for use with coating grade p o l y v i n y l a c e t a t e to d e v e l o p inexpensive washable fire-resist ant q u a l i t i e s in i n s u l a t i n g a n d wallboard coatings for industrial and non-industrial uses. INTERIOR FACTORY W A U
ACOUSTICAL TILE CEILING
SHIPPING CARTONS FOR FLAMMABLE PRODUCTS
For further details on BOROTHERM,
or for special technical service to assist you in the formulation of coatings, write —
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SALES
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DEVELOPMENT
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vmmtmimsii & Chemical'Qnvoration kiM*vim*mi.*uudm*AW&UAfM.im4!mmKm * Trade Mark AP&CC
2918
M e t a l Cans Minus Tin Metal cans from materials available on North American continent goal of American Can's research τ TNTINNED
STEEL,
specially
treated
* ^ steel, aluminum, and steel coated with aluminum, zinc, a n d possibly nickel constitute the materials which are expected to go into our tin cans of t h e future. American Can's long range program is to find domestically produced alter nate metals for tin and other can making materials which now must be imported over long sea lanes and which are in t h e path of any future communist ag gression. As yet there is no one metal coating which can serve as a universal alternate for tin plate. For the foreseeable future, most of t h e tin-free metal cans must b e manufactured from steel or steel coated with other metals; no other metal is available in sufficient quantity to supply the 35.6 billion cans now pro d u c e d annually. Untinned steel is the least expensive sheet metal; its mechanical properties are essentially t h e same as those of tin plate. Present mill production and fab rication facilities give it the highest potential as a replacement for tin plate, say company spokesmen. It has the disadvantage, however, of requiring enameling on both sides to prevent corrosion. Another alternate for tin plate is "can making steel" processed with t h e end use as steel in mind. I t is believed that modifications of t h e processing procedure, after cold reduction, can re sult in a product which will b e more resistant to rust and underfilm corrosion and t o which enamels will adhere more efficiently. Results obtained from the use of chemically treated steel have been en couraging. It is likely to b e one of the first alternates for tin plate. It can be used for the ends of cans containing low acid food products and, if means of sol d e r i n g it can be found, for t h e bodies as well. However, its future use will de p e n d upon its price in relation to other plates and upon the properties of "can making steel" which will b e developed. Aluminum for metal cans has both attractive and unattractive features. Its weight, which gage-for-gage is only 3 6 % as heavy as tin plate, is desirable. A disadvantage is its softness. Alumi n u m cans are used in Europe b u t re q u i r e special processing and handling precautions. Various techniques for ap plying aluminum coatings to steel are CHEMICAL
close to the pilot plant stage; it is too early to determine how specific proper ties of the e n d products will be affected by the coating process. T h e goal is to apply enough aluminum to provide about the same rust resistance as does tin. Aluminum on steel possesses me chanical properties comparable to tin plate and enables use of the same equipment as employed in tin can fabrication. Other tin plate alternates are zinc and nickel-plated steel. Present indi cations a r e that these plates are appli cable only for certain classes of prod ucts for which other alternates are not suitable. Cements are gaining prominence in the can making industry. At present most quart motor oil cans are made of CMQ black plate with cemented side seams. This cementing procedure is being extended into other styles a n d sizes of cans a n d is expected to be a p plicable to all of the potential tin plate alternates. T h e procedure will make possible tin-free containers for many items and will provide cans with allaround lithography. Success has r e cently been obtained in cements with marked bonding as well as caulking properties. W h e n cements with the bonding and sealing properties of sol der are finally available, t h e can mak ing industry can b e expected to find an immediate use for them. The research which American Can is doing in the w a y of finding new metals and processes for manufacture of metal cans was described at the 14th annual meeting of t h e Institute of Food Tech nologists held at Los Angeles. Ameri can representatives w h o participated were R. H. Lueck, K. W . Brighton, and R. W. Pilcher, of t h e company's research and technical department.
• Fiber d r u m for packing, dispensing, storing, and shipping wire is Conti nental Can's Payoffpak. Drum has center core around which wire is packed, special attachment fitting over core to guide dispensing of wire, and metal lid with leverlock metal band. C 1 For further information on the keyed item mentioned here, see coupon on page 2926 AND ENGINEERING
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