Viscosity directly in centipoises HOEPPLER VISCOMETER
NEW CHEMICALS
PRECISION MODEL
Radio-Decontamination Cleaner Isoclean Concentrate possesses a new formula for the radio-decontamination of research and clinical labware. The product now contains highly efficient solubilizing agents, thus increasing its effectiveness for removing isotopic activity from glass, metal, or plastic surfaces. Isolab, Inc., 1510 Ash Dr., W., Elkhart, Ind. 46514. 219-264-0120 501
Hoeppler Viscometer provides a fast, accurate method of determining viscosity of gases, liquids, oils, plastics, syrups, viscous tars and dark liquids. From 0°C. to 100°C. Direct readings in centipoises (or centistokes). From 0.01 to 1,000,000 centipoises. Accuracy 0.1% to 0.5%. Small sample (30cc) required. Results consistent and reproducible. Price $3 50. Interchangeable spare parts
available.
Write for Bulletin HV-303.
MADE
IN
TJ.S.A.
UBBELOHDE VISCOMETER on the principle of the suspended level capillary-type viscometer for determining the kinematic vis of cosity any true viscous liquid, such as petroleum products or lubricants. See American Society for Testing Materials, A.S.T.M. designation D 2515. than =t0.1%, when Measures viscosity with an error not greater used at efflux times at 80-1000 seconds. The smallest listed capillary is used for light fuel oil or kerosene, the others for lubricating of the bath should be controlled within oils. The temperature
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±0.02°F. all capillary sizes as called for by the A.S.T.M.—calibrated uncalibrated. Uncalibrated capillary, $24. Calibrated, S42. or Metal frame to fit capillary, $7.50. Write for Bulletin UV-514. In
Standard Buffer Solutions
Fifty-one different values of pH buffer, packaged in ready-mixed, concentrated, and powder form in four different types of containers are available. Buffer solutions are packaged as “Buffer Boats” in plastic-lined cartons with no-drip faucets, and in unbreakable polyethylene bottles. Powder buffers that are hermetically sealed in plastic tubes are available in six different pH values. Bulletin 805 contains detailed information including prices on these products. Beckman Instruments, Inc., 2500 Harbor Blvd., Fullerton, Calif. 502 92634. 714-871-4848
BARRIER AND EXCITING FILTERS FOR FLUORESCENT STUDY $6.50 each, 2 x 2" x 1 to 3mm $7.50 each, 50mm diameter $4.50 each, 25mm diameter
Standard Stock Types:
Processed in
New Rochelle Optical Shop.
our
Write for Bulletins CF-417, UV-430 and ND-419. FISH-SCHURMAN CORPORATION 72 Rorfman Road, New Rochelle, N. Y. 10802
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Fish-Schurma Circle No. 64 on Readers' Service Card
Nylon Solvents Several new solvents are available for quality control during the manufacture of nylon polymer. Polysol-one can be used for dissolution of nylon for titration of unreacted end groups with perchloric acid. The viscosity of nylon solutions in Polysol-two is a function of
chain length and may be used to control polymerization reactions. Polysolthree is high-purity wi-cresol, which is a solvent for polyesters, as well as nylon. Pollard & Co., P. O. Box 7131, 503 Wilmington, Del. 19803
A Reagent-CatalystTRI-SIL Solvent formulation for preparing Trimethylsilyl derivatives of polar compounds under mild conditions. Smooth. .Positive. Broadly Useful. No. 48999 TRI-SIL $16/50 ml —
Can Use These 3 Proven Aids
To Advantage. Of Them Do!
Ultrapure Liquid Crystals A new line of zone refined liquid crystals is characterized by a sharply de-
08540.
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NEARLY EVERY GAS CHROMATOGii
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fined mesophase and exceptionally high resistivities. Also available are ultrapure organic reagents—99.999 mol % purity anthracene, phenanthrene, pyrene, and p-terphenyl. Single crystals of some of these organic materials have been produced. In addition, ultrapure organic reagents, PAR GRADE, packaged and shipped under argon gas, are 99.99 mol % pure. Bulletins 8, 9, and 10 describe these materials. Princeton Organics, Route 206, Princeton, N. J.
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.And A Lot
BSA One of the most powerful silylating agents known. and ours is the world's finest. No. 38837 BSA $9/25g —
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||w: Ask For FREE
"Silylation Handbook"
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GLC Column CondiSilyl-8 tioner. Stabilizes errant columns in a few minutes. Just shoot directly into the chromatograph. No. 38014 Silyl-8 $8/25ml vial or $10 for 12x1 ml vials —
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PIERCE CHEMICAL COMPANY P. O. Box
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117
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Rockford. it
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Illinois twx
61105
910-531-3419
504
Circle No. 177 on Readers' Service Card
ANALYTICAL CHEMISTRY. VOL. 42, NO. 2, FEBRUARY 1970
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