STANDARDIZING | on Nicholson
Products
and *Pn&ceaAea
Valves
r* PAYS OFF^bsa» A survey of large users of N i c h o l son cylinder con trol valves shows these leading rea son's for t h e i r specification: 1 ) S p e c i a l seats, don't c u t o u t . 2 ) Fast, positive act Style Ε for air, sa», ing. 3 ) Stuffing o i l , steam, water; box easily re pressure to 500 lbs. packed, ^ h e a v y bodied, take abuse. 5) N e a t , installed in any position. Nicholson control valves are furnished for all mediums and types of operation — lever, foot, solenoid and motor. Choice of 6 metal combinations to meet specific needs. Pres sures t o 5 0 0 0 lbs. Style H , pressure to 5000 l b · .
Catalog 546
W. H. NICHOLSON & CO. 1 8 6 Oregon St., Wilkes-Barre, Pa.
VANNOUNCING
For further information on any items mentioned here, fill o u t coupon o n p. 2844.
Ultrafine Alumina
Powders
Two high-purity alumina powders char acterized by ultrafine, uniform particle size, exceptional hardness a n d large sur face area, are now offered in commercial quantities by the Linde Air Products Co. These have proved successful as ultrafine abrasives in metaliographic polishing, and in view of their over-all physical and chemical properties they show promise in optical and gem polishing, metal finishing, as ingredients in t h e manufacture of phos phors, and as catalyst carriers in chemical processes. Both powders have a high degree of purity (99.9 + % Α12(λ>), are unaffected by acids, a n d by 3 0 % N a O H a t 80 °C. Type A-5175, alpha aluminum oxide, has a hexagonal crystal structure a n d a hardness of 9 on Moh's scale. Particle size is approximately 0.3 micron and the apparent density 4 grams per cubic centi meter. T h e second powder of this class is T y p e B-5125, G a m m a aluminum oxide, having a cubic crystalline form, a n d a hardness of 8 on Moh's scale. Particle size is less than 0.1 micron, a n d apparent density 3.6 grams per c.c. Ρ1
Poly acrylic
HUMPHREY-WILKINSON, INC. Chemical Manufacturers
Successors to CHEMICAL DIVISION C O N N E C T I C U T H A R D RUBBER C O .
T H E new corporation will continue t o manufacture a broad line of in termediate molecular weight aliphatic derivatives, including the series of olefins, alkanes, ethers and mercaptans which have become well-known under the original name.
Write for new literature price lists
and
HUMPHREY-WILKINSON, INC. Box 1 6 7 1 , N e w H a v e n , Conn.
2840
Ester
T h e manufacture of Lactoprene EV, a modified polyacrylic ester, is announced by B. F . Goodrich Chemical Co. This material is an experimental product de veloped b y t h e E a s t e r n Regional Research Laboratories of the D e p a r t m e n t of Agri culture. T o be redesignated as Poly acrylic Ester EV, it will complement other nitrile and polyacrylic ester type rubbers, now being manufactured by B . F . Goodrich Chemical Co. A t present i t is available in pilot plant quantities only. Ρ2
Tough
Copolymer
A new vinyl copolymer resin has been made available t o t h e plastics industry by t h e Goodyear Tire & Rubber Co. T o be known as Pliovic, it possesses several proc essing advantages which, it is thought, should arouse interest in t h e fabricating trade. Although Pliovic displays the inherent toughness characteristic of high vinyl copolymers, its chemical n a t u r e is such t h a t it actually requires less plasticizer and is easier to process t h a n most of the similar, high molecular weight materials now on the market. In addition, it has C H E M I C A L
been found t h a t Pliovic c a n be utilized t o produce organosols which fuse with less heat t h a n average a n d c a n produce films which h e a t seal a t lower t e m p e r a t u r e s . Pliovic is supplied as a white granular powder which is odorless, tasteless, and which does not s u p p o r t combustion. Typical applications are in calendered film and flooring, extruded tubing and hose; and as a n organosol in dipped goods and coated fabrics. Ρ 3
Arc-Welding
Electrodes
Four electrodes developed for use in a wide range of arc-welding operations h a v e been announced b y General "Rlectric's welding equipment divisions. One is designed to meet the need for a n electrode with a low-hydrogen coating, manganese-moly analysis, and good us ability characteristics, a n d is suitable for welding most hardenable steels where t h e hazards of under-bead cracking are to be eliminated. A n o t h e r type, a low-hydrogen electrode of a molyvanadium composition, can b e used with either a-c or reverse polarity d-c to weld a wide variety of low-alloy steels. It i s especially suited for welding low-alloy pipe, including carbon moly a n d chromestabilized carbon moly a n d new varieties of pipe considered "high tensile." A low-hydrogen, titania-coated elec trode of 2 . 5 % nickel composition, can b e used on steel castings of a similar analysis and for producing weld deposits h a v i n g high impact properties a t subzero tem peratures. Ρ 4
Rubber Phenolic Compound Highly Shoch Resistant A Hycar-phenolic molding powder said to provide high shock resistance charac teristics to instrument cases, knife handles, power tool handles, a n d a variety of other applications which undergo rough t r e a t ment, h a s been developed b y General Electric Co. I t possesses the good moldability and h e a t resistance of wood-flour filled phenolics and is strengthened b y t h e toughness and resiliency of Hycar-Americ a n rubber to t h e point where i t can replace cotton *flock a n d rag-filled compounds for m a n y applications. C e r t a i n tests of t h e new c o m p o u n d ^ , : designated G-E 12446, indicate t h a t i t s resistance to i m p a c t is m a n y times more t h a n t h a t of s t a n d a r d wood-flour filled phenolic materials. I t possesses low bulk A N D
E N G I N E E R I N G
N E W S
factor, excellent powder pourability, pro vides good finish, and can be rapidly pre formed in automatic equipment. The compound can be molded into complex parts by either compression or transfer methods in molds designed for ordinary wood-flour filled phenolics. Ρ5
Water
Making or Holding Products Uniform
Purification
The Philadelphia Quartz Co., manufac turers of sodium silicate for industry, announces the issuance of a process patent on the purification of raw water. U. S. Patent 2,444,774 was granted recently to Harold R. Hay and assigned to the com pany. This patent covers the N-Sol-A process of preparing activated silica sol which has been formed by reaction with ammonium sulfate or other salts of ammonia and dilute sodium silicate. This sol used in con junction with a coagulant such as alum or iron salts produces rapid formation of large floe resulting in the removal of a greater percentage of impurities from the raw water. Ρ6
Starch
Development
General Mills is offering two modified purified wheat starches said to have wide spread applications in the food and con fectionery industries. Pending the selec tion of trade names, the starches will be known as A-22, a thick-boiling purified and modified starch of unusually high stabilizing power, and a B-24 series of controlled fluidity starches. The A-22, result of a specially developed process that produces a starch of high water holding capacity, has many uses in cluding that of thickener and stabilizer in homogenized baby food, as a fat emulsifier in soups, for pie fillings, in baked products such as wafers and cones, and as thickener and emulsion stabilizer in salad dressings. Tests show it to have a more stable gel than other starches. The B-24 series of controlled fluidities are of special interest to confectioners, be ing preferred for high grade jellies and gum drops. Certain numbers of the B-24 series have applications in industrial fields. Ρ7
Textile
High Precision Industrial Air Conditioning with extremely dry atmospheres (or with high relative humidities) at low temperatures. • Specializing for t h i r t y y e a r s in the m o r e difficult p r o b l e m s of air conditioning for industrial processes, this C o m p a n y h a s devel o p e d a g r o u p of units t h a t m a k e it easier and less e x p e n s i v e for y o u to get the p a r t i c u l a r air conditioning benefits y o u m a y need for y o u r special process, or t o o v e r c o m e s o m e obstacle of climate o r condition t h a t is i n t e r r u p t i n g y o u r p r o d u c t i o n or c a u s i n g loss f r o m rejected p a r t s or m a t e r i a l s . T h e N i a g a r a " N o - F r o s t " Method, for example, h a s been u s e d to c r e a t e t e m p e r a t u r e s as l o w a s -90 ° F . in cold test r o o m s , a n d t o p r o v i d e air w i t h o n l y 1 gr. of m o i s t u r e p e r lb. for special processing. T h e N i a g a r a T y p e " A " Air Conditioner creates a n y condition of t e m p e r a t u r e a n d h u m i d i t y for a test or p r o c e s s , a n d if w a n t e d , c r e a t e s different conditions in different r o o m s s i m u l t a n e o u s l y . S o m e of the i n d u s t r i a l applications of t h e s e u n i t s : internal c o m b u s t i o n engines, m o t o r s a n d air craft, s u p e r - c h a r g e r s a n d c a r b u r e t o r s , gas cooling a n d controlled a t m o s p h e r e p r o c e s s , film, plastics, fiber, r u b b e r a n d a d h e s i v e s control, biological p r o c e s s i n g s u c h a s penicillin, and y e a s t . Write for a Niagara Blower Bulletin on a subject which interests you, or for the address of the nearest Niagara Field Engineer.
Fiber
E. I. du Pont de Nemours & Co., Inc., has adopted the trademark * Orion" for its synthetic textile fiber called Fiber A. Technically the material is a polyacrylonitrile fiber, and quantities required for the development work are being made in a laboratory-scale pilot plant. Orion is resistant to degradation by sunlight, which commends it for use in awnings, automobile tops, and other out door uses. Its resistance to chemical attack, partic ularly by acids, and its ability to with stand elevated temperatures fit it for use in filtration applications and chemicalresistant cordage and threads. Ρ8 VOLUME
2 6,
NO.
38
N I A G A R A BLOWER C O M P A N Y Over 35 Years of Service hi Industrial Air Engineering 4 0 5 L e x i n g t o n Ave. N e w Y o r k 17, N . Y . District Engineers hi Principal Cities
INDUSTRIAL COOLING
HEATING ·
DRYING
NI«RA HUMIDIFYING · AIR ENGINEERING EQUIPMENT
. S E P T EMBER
2 0,
1948
2841
