Portable pH Meters Have High Accuracy Coleman and E. H. Sargent offer units that can be used either in laboratories or in the field Two portable p H meters have been introduced to extend the range of application for this type of instrument. Both Coleman Instruments and E. H. Sargent now offer pH meters that can be used in the laboratory as well as in the field. Although accuracies for the instruments differ, each provides the same degree of accuracy in the laboratory as it does in the field. Coleman Instruments has a portable, high-accuracy pH meter. The compact new meter weighs only eight pounds and it operates from either a battery or alternating-current power lines. It is about the size of a small attache case and it is accurate to within 0.001 pH at the standardization point, according to the May wood, 111., instrument maker. Known as the Coleman Model 37 Medallion p H meter, the new instrument uses solid-state circuitry and a
rechargeable battery to achieve its compactness and light weight. All the circuitry is solid state except an electrometer tube used for the input stage. The single nickel-cadmium battery used in the Coleman instrument replaces the multiple dry cell arrangement common in other battery-powered meters. Also this nickel-cadmium battery can be recharged up to 500 or more times. As each charge gives about 20 hours' operation, a single battery will last about 10 years, Coleman says. The battery is recharged simply by plugging the instrument into alternating-current lines, setting a switch, and leaving it overnight. The Model 37 instrument can also run directly off the power lines. But its ability to run off its battery gives another advantage in addition to
portability. It increases accuracy by freeing the instrument from the stray fields and other undesirable effects associated with alternating-current power lines. To further increase accuracy, the instrument measures p H by a potentiometric null-balance system. This eliminates any meter error. The measurements are shown on a digital readout with the third decimal place being read from a dial. The new Coleman instrument costs $530. For use just on alternatingcurrent lines, when the battery is not needed, the price is $495. E. H. Sargent (Chicago, 111.) offers two versions of its meter. One version can be used with a mercury-cell battery for field operation; The other can be used in the lab, and has a Zener-referenced power supply. Both versions have the same accuracy— ±0.03 p H units when measuring within 4 pH units of the standardization point. Absolute accuracy at any place on the scale is ± 0 . 0 5 p H units. Prices vary, according to the accessories required, from $255.00 to $295.00, Sargent says.
Westinghouse Offers Phosphor For Color TV Tubes
PORTABLE. The Coleman Model 37 Medallion pH meter can be used in the laboratory or can be used in field analyses with equal accuracy. Its field potential is being demonstrated here in the analysis of circulating cooling water 54
C&EN
NOV.
2 3,
1964
Introduction of a second rare-earth red phosphor for color television tubes —this one from Westinghouse—follows a breath behind the disclosed details of the first—that one from General Telephone & Electronics (C&EN, Nov. 9, page 67). The latter, europiumactivated yttrium vanadate had, however, been in commercial use by GT&E's Sylvania subsidiary since June. Westinghouse's new phosphor is europium-activated yttrium oxide. Westinghouse has applied for patents on the phosphor and on a process to make it. Both Westinghouse and GT&E use the rare-earth phosphors instead of the conventional silveractivated zinc cadmium sulfide redemitting phosphor. GT&E says that its ratio is one ion of europium to 19 ions of yttrium. Westinghouse, however, will not disclose the ratio used because of possible patent uses. Westinghouse says that it is discussing use of its red phosphor with color TV manufacturers and can supply the material in commercial quantities now. The company adds that the phosphor will be made at its Bloomfield, N.J., facility.
PAPER CHEMISTRY
M C P PAPER CLAYS IMPROVE ALMOST EVERY TYPE OF PAPER ULTRA WHITE 90 . . . 90 + G.E. Brightness, fine fraction coating and filling clay produced by Ultraflotation SPRAY SATIN . . . A fine fraction, spray-dried, predispersed coating clay STELLAR . . . A fine fraction, nonpredispersed coating clay PREDISPERSED H T . . . A spray-dried, predispersed, intermediate fraction coating clay H T . . . A rotary dried nonpredispersed intermediate fraction coating clay PREDISPERSED S - 2 2 . . . An intermediate fraction, spray-dried, predispersed machine coating clay KLONDYKE... A fine particle size, high brightness filler clay NIIN-CHEM Special... An intermediate size, high brightness, fractionated filler clay For samples or a copy of . NOKARB . . . A large particle size, fractionated, maximum retention filler clay Tl 101 (data on Edgar Clays) just use the coupon, drop us % ATTASORB . . . MCP's new show-through reducer for newsprint a line, or give us a call.
EDGAR PAPER C L A Y S
from... Minerals & Chemicals Philipp Corporation 1347 Essex Turnpike, Menlo Park, N J .
MCP
Please send me the following: Sample of
•
Tl 101
(specify grade) Title-
Name Firm Address City
Zone-
State.
MINERALS & CHEMICALS PHILIPP CORPORATION 1347Essex T u r n p i k e , M e n l o P a r k , N e w J e r s e y
08837
Telephone: Code
201-548-2200 C & E N 55
COSMETIC GRADE
SPERMACETI (HYWAX-125)
especially suited for HAND and FACE CREAMS CLEANERS, DEODORANTS • Exceptionally long shelf life. Stable emulsions and creams. Coupling action for many systems. Flake form-in 50 lb. bags. Uniform from batch to batch. SAVE up to 25% vs. U.S.P. Grade
WERNER G. SMITH INC.
Flash Drying Methods Evaluated By Bench-Scale Pneumatic Dryer Rapid evaluation of flash drying methods is possible with a new bench-scale, vertical, pneumatic dryer made by Bench Scale Equipment Co. According to the Dayton, Ohio, company, data from tests on the equipment can be used for accurate scale-up. This will substantially reduce development cost for new products and processes. Interchangeable electric or gas heaters make it possible to operate the unit from ambient temperature to 1300° F. Air velocities up to 6000 ft. per minute are calibrated through orifices for reproducibility. Feed rate can vary from 5 to 20 lb. per hour. Dried product is collected through a cyclone, which removes all particles of over 25 microns. Recycle of the dried product can be obtained through optional equipment. E 31
BRIEFS Loading of the Pathfinder nuclear
1730 TRAIN AVENUE · Phone: 861-3676
CLEVELAND 13, OHIO Area Code: 216
2 MINUTE OXYGEN ANALYZER NEWI ^K3k FROM
W^&
One of the most significant developments in laboratory apparatus in recent years. A fast, accurate method for determining oxygen in steel. No solut i o n s , no glass blower, no vacuum. For use in research laboratories, final analysis laboratories, and quality c o n trol laboratories. Write for detailed
information.
LABORATORY EQUIPMENT CORP. 2398 Hilltop Road, St. Joseph, Mich.
56
C&EN
NOV.
2 3,
1964
reactor's superheater has begun near Sioux Falls, S.D. Engineers and physicists from Allis-Chalmers' atomic energy division and Northern States Power Co. began installing 412 tubular fuel elements containing highly enriched uranium dioxide into the superheater core of the plant's reactor vessel. Each tubular element for the superheater is about 1 in. in diameter and consists of two concentric fuel tubes 6 ft. long. The Pathfinder achieved initial chain reaction on March 24, and has been operating for test purposes only since Sept. 18. It was shut down to permit safe loading of the superheater.
Evaporated-layer cadmium sulfide transducers that produce either transverse or longitudinal waves have been made by a new technique at Bell Telephone Laboratories. The vacuum deposition process is a continuation of the deposition method reported by Dr. N. F. Foster of Bell Labs last year. In the process, cadmium sulfide is heated in a boat and evaporated to be deposited on a metal-plated surface. When the cadmium sulfide strikes the surface at an oblique angle, transducers are formed that generate predominantly transverse waves. Deposited at right angles, transducers are formed that produce longitudinal
waves. This effect arises from an alignment of the cadmium sulfide with the vapor beams. Previously it was necessary to suppress unwanted modes by using acoustical filters and other polarization techniques. Now this is done by the transducers themselves, according to Bell Labs.
Substituting malic acid for citric acid
in carbonated beverages can reduce the cost of manufacture up to 2 5 % . In addition, Allied Chemical's National Aniline Division says, a better tasting product is produced. According to the finding of a 21-member taste panel, the use of malic acid also improves the flavor enhancement of carbonated beverages.
NEW CHEMICALS Pure alkyd resin with fast drying characteristics is now available for industrial finishes and maintenance coatings from Cellomer Corp. The WoodRidge, N.J., company says that Cellokyd 6085X contains no styrene, vinyl toluene, or rosin modifiers, and can be used in automotive refinishing, aerosol packaging, and metal decorating fields. C 60
Hexafluoroisopropynol is available in research quantities from Hynes Chemical Research Corp., of Durham, N.C. The product is a highly acidic alcohol and should find use as a specialty solvent and as a chemical intermediate, according to the company. C 61
Research
quantities
of
a
glycol,
resorcinol bis (^-hydroxyethyl) ether, are available from Burdick & Jackson Laboratories, Inc., of Muskegon, Mich. The material is of interest as a monomer and modifier of polyester and polyur ethane resin. It is also a crosslinking agent for epoxy resins. C 62
A fluorogenic substrate for phosphatases is offered by Mann Research Laboratories, Inc. According to the New York, N.Y., company, 3-o-methyl fluorescein phosphate liberates 3-omethyl fluorescein on enzymatic hydrolysis. It has a very intense green fluorescence and its excitation wave length is in the visible blue region of the spectrum (450 to 480 m ^ ) . C 6 3
G O O D WAY TO RETARD FLAME
Use Neville Unichlor@in Your Formulae Among the principal reasons for using UNICHLOR, Neville's chlorinated paraffin, in your formulae is its ability, when combined with small amounts of antimony trioxide, to retard flame in such products as plastisols, paints, fabric coatings, adhesives and rubber goods. This quality is constantly becoming more important in product manufacture. Many state and city building codes now require flame retardant materials in critical areas, and the
armed forces are specifying flame retardant products in increasingly varied applications. Because of the direct relationship of chlorine content to flame retardance in a formula, Neville has developed several grades of UNICHLOR which will materially increase the chlorine content of your product without loss of plasticity, tack or other valuable assets. If you would like further information on UNICHLOR write for our new booklet.
Neville Products
NEVILLE CHEMICAL CO.
Resins — Coumarone-lndene, Hydrocarbon — Thermoplastic and Heat Reactive, Hydroxy • Oils—Plasticizing, Rubber Reclaiming, Shingle Stain • Solvents • Antioxidants—Non-Staining Rubber • High Purity Indene • Indene Chemicals • Paving Materials • Chlorinated Paraffins Ortho and Para Dichlorobenzenes.
PITTSBURGH, PENNSYLVANIA • 15225 ANAHEIM AND SANTA FE SPRINGS, CALIF.; UITHOORN, HOLLAND
C&EN
INDUSTRIAL CHEMICAL SPECIALTIES
PROGRESS REPORT
These items have all been mentioned editorially in C&EN in the past month. If you haven't already sent for information on them, just check the appropriate key numbers on the coupon on page 62, and C&EN's Headers' Information Service will forward your request to the manufacturer. |
Product
Primers (Eccoprimes PP, N-23, PPR-I, and B-25) Epoxy bonding material (Inlaycrete) Polymers (Series 2000)
Company
C64
Emerson & Cuming, Inc. Canton, Mass.
C65
Garland Co. Cleveland, Ohio lonac Chemical Co. Division Pfaudler Permutit, Inc. Birmingham, N.J. Metal Hydrides, Inc. Beverly, Mass. Monsanto Co. St. Louis, Mo. National Aniline Division Allied Chemical Corp. New York, N.Y. Pennsylvania Industrial Chemical Corp. Clairton, Pa. Shawinigan Resins Corp. Springfield, Mass. Stauffer Chemical Co. New York, N.Y. Texaco,Inc. New York, N.Y.
C66
Bleaching assistant (Tensol) Coating resin (Vyset 69) Dye (National Paper Black R)
C67
Terpene phenolic resin (PiccoXTP-100)
C70
Polyvinyl butyral resin (Resin D-509) Additives (Stabilizers A-922 and A-1176) Hydraulic oils (RandoHDAandC)
C71
Polyethylene powders
C74
C68 C69
C72 C73
U.S.I. Chemicals Division National Distillers and Chemicals Corp. Cincinnati, Ohio
1
Features
For improving the adhesive properties of plastics For fusing new floors to old without need for chipping the old floor Vinyl and methylivinyl pyridine polymers and copolymers 1 1 1 A white paste for use with cotton and cotton blends 1 1 For finishes on appliances and other preformed metal items 1 I Has outstanding light-fastness, good solubility, and is easily bleached 1 1 Gives clear lacquers when used with acrylic resins 1 1 1 For imparting toughness and durability to adhesive and coating systems 1 1 For stabilizing plastics against heat and light 1 Provides antiwear protection for pumps operating at pressures above 1500 p.s.i.g. 1 Spherical particles with average diameters of 8 to 30 microns 1 |
Available in commercial quantities unless otherwise noted.
NEW EQUIPMENT Line of carbon steel pipe connectors has been introduced by the fabricated metals division of H. K. Porter Co., Inc., of Pittsburgh, Pa. The W-S TeeLet connectors are available in threaded, butt-weld, and socket-weld types. Sizes have been extended to 4 in. for use on pipes with diameters up to 36. in. E 32
Metering pump made principally from graphited Penton plastic is now offered by Tuthill Pump Co., of Chicago, 111. The pump can be used with chemicals which do not attack 316 stainless steel. It handles fluids at temperatures to 170° F., and pressures of 50 p.s.i.g., the company says. E 33
An electron probe x-ray microanalyzer is now being produced by Acton Lab58
C&EN
NOV. 2 3,
1964
oratories, Inc., of Acton, Mass. According to the company, a licensee of the French firm, CAMECA, the analyzer will handle volumes of a few cubic microns and is accurate to about 1 %. It is used for research and analysis on metals, ceramics, minerals, and biological specimens. E 34
Chromatogram scanning systems used in biochemistry and medical research are now available from Tracerlab division of Laboratory For Electronics, Inc. These highly effective and sensitive systems permit accurate location of low-energy, beta-emitting isotopes such as tritium and carbon-14, the Waltham, Mass., company says. E 3 5
A multistage, in-line mixer, designed to blend low-viscosity color pigment with high-viscosity materials on a continuous basis, has been introduced by
Mixing Equipment Co., Inc., of Rochester, N.Y. The mixer is offered in two- or three-stage segments. E 3 6
Line of vacuum pumps for draining condensate from steam processing units is available from Stickle Steam Specialties Co., of Indianapolis, Ind. Type H pumps feature a booster pump and are offered in 12 sizes to handle up to 120,000 lb. of condensate per hour. The pumps are available in simplex or duplex models. E 37
Compact, constant-pressure pumping system is available from Aurora Pump division of New York Air Brake Co. (Aurora, 111.). It is designed for use where constant pressure or liquid level must be maintained. The system is designed to handle 7000 gal.-perminute flows, according to the company. E 38
purity,
service,
now, a 100-million pound VA p l a n t (what more can w e a d d to our monomers?)
Our acrylates are 99.5% pure . . . the result of a unique Celanese beta-propiolactone process. And this higher quality costs you not a penny more. What's more, we don't stint on service. Like technical assistance on polymerization . . . combination shipments of acrylate monomers (methyl, ethyl, butyl or 2-ethylhexyl) .. . combinations of acrylates and solvents. We're rather big in acrylic acid and vinyl acetate, too. In fact, our new vinyl acetate plant, one of the world's
largest, will be on-stream early in '65. So try us for product and service. Write Celanese Chemical Company, Dept. 554-K, 522 Fifth Avenue, New York 36, N. Y. celanese® Celanese Chemical Company is a division of Celanese Corporation of America. Canadian Affiliate: Canadian Chemical Company, a division of Chemcell, Limited. Export Sales: Amcel Co., Inc., and Pan Amcel Co., Inc., 522 Fifth Avenue, New York 36.
CHEMICAL
COMPANY C&EN
59
:cP
The symmetrical molecular cage structure of Triethylenediamine and its freedom from steric hindrance makes the electron pairs at the "bridgehead" nitrogen atoms readily accessible. This gives I OABCO an unusual ability to catalyze reactions of isocyanates | with compounds containing active hydrogen atoms.
DABCO® catalyst gives maximum control in processing and optimum final properties of rigid urethane foam lowest K factors. Although highly efficient, DABCO permits a wide latitude of control, delaying gelation or hardening of the foam until rise is complete. This is important when rising foam must flow about intricate molds, around corners, and even knit with foam rising in the opposite direction. Because the foam remains flowable, all spaces get filled. The shearing action of the rising foam is also reduced. On pour-in-place jobs, ultimate adhesion is increased, while in molded forms, striations decrease and uniform surfaces result. For better processing conditions . . . maximum control . . . finer foams . . . no other catalyst performs like DABCO because no other catalyst is built like DABCO. For PROCESS AND CHEMICAL more data, write to us. *DABCO is also available in easy-handling COMPANY
For both prepolymer and one-shot foams, DABCO offers you important processing advantages. In one-shot systems based on crude isocyanates, it can now be used to give you both top performance and economy. DABCO-DMEA Catalysis. N,N-dimethylethanolamine is a low-cost amine which, teamed with DABCO, serves to neutralize the acidity of the crude isocyanates, thus freeing DABCO to catalyze polymerization at a desired rate. New Economy. This combination offers you the advantage of a DABCO-catalyzed foam with no increase in formulation cost. At low concentrations of . 1 % ^ DABCO* (with .2% DMEA) based * on total formulation weight, the cost of catalyst per pound of foam is less than a penny.
i LLI
Why DABCO Gives
Better
Control. DABCO promotes a rapid initial polymerization which develops a fine uniform cell structure for
1339
mm
Chestnut Street, Philadelphia, Pa. 19107
Division of AIR PRODUCTS AND CHEMICALS, INC. * H o u d r y means Progress . . . through Catalysis
low viscosity solution DABCO 33-LV . . . containing 1 part DABCO dissolved in 2 parts dipropylene glycol by weight
Pat. Reference: the use of Triethylenediamine as catalyst in production of poiyurethanes is covered by our U. S. Pat. No. 2,939,851. Corresponding pats, have been issued in a number of foreign countries. Other U.S. and foreign pat. applications pending.
60
C&EN
Mechanical packing that resists difficult acid conditions has been developed by Chesterton Packaging & Seal Co., of Everett, Mass. The packing, style 326, has a high Teflon content for lubrication and chemical resistance. It also has asbestos instead of cotton fiber and is, therefore, relatively frictionless, the company says. Each strand is separately and completely sealed with Teflon suspensoid, according to the company. E 39
available include 1 / 4 -, 3 / 8 -, and 1 / 2 -in. internal pipe thread diameter for service up to 5000 p.s.i.g., the company says. E 40
Further information on keyed Equipment and Chemicals items is readily available . . . Use handy coupon on page 62
November 23, 1964
Readers' Information Service Use this handy self-mailer to obtain further information or literature. Simply mark the items desired, fill out the information requested, clip the coupon, fold, staple, and mail. (Please fill out coupon completely.)
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FAMOUS CHEMICAL REFERENCE Greatly Expanded in Size and Scope THE MERCK INDEX—outdating previous editions—is now ready for your reference. Published as part of a program of professional service, it is completely updated, increased in size, and expanded by 2,300 chemical monographs. New cross-indexing quickly leads you to concise information on any given substance—regardless of whether you look it up under brand name, generic name or chemical name. Send coupon now for your copy. Luxuriously bound Contains 1600 pages • Mmim®
Your Industry:
I7TH
Recording spectrophotometer is now
offered by Carl Zeiss, Inc., of New York, N.Y. The RPQ 20 A is a doublebeam instrument with a range of 200 to 2500 m/x. for continuous measurement of extinction, transmittance, and energy. There are no moving optical parts, the company says. E41
Flow control valve that combines two valves in one body is being offered by Republic Mfg. Co. According to the Cleveland, Ohio, company, this gives full flow of gas or liquid in one direction, and metered flow in the other direction. Desired flows are set by 100 positive microsettings. Sizes
O
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