READERS' INFORMATION SERVICE Manipulators Microscopes Mixers
57 14,121 93,136
Oil Distillates Organic Chemicals & Reagents Ovens Oxygen Bombe
53 10 114 102
pH Meters Photometers Pipettes Polarizers Polarographic Apparatus Potentiometers Presses Pumps
58, 104-1 62, 103-2 74 28 110 92 43 23, 27-1
Radioactive Carbon Reagents 99-1 Radioactivity Measuring Instruments . . 99-2 Radioisotopes 99-3 Reagents 20,47 Recorders . . . . 3 1 , 32, 33, 34, 66, 104-3 Refractographs 3 Safety Enclosures Scales Shakers
54 18 7,11
Spectrogram Catalog Spectrographs Spectrometers Spectrophotometers Sterilizers Stills Stirrers Stopcock Plugs Stopcocks Supplies Syringes
109 147 21, 51, 64 19, 44, 98, 118 137 48-1 1, 27-2 119 38, 132 72 37
Temperature Potentiometers Thermistors & Varistors Timers Titrators Titrometers Tubing Viscosimeters
7famaL assortment of POLYETHYLENE POLYPROPYLENE TEFLON and other Plastic Laboratory Ware
85 22 106 122 105 95,148 142-1,142-2
Ware, Glass Ware, Plastic Water Baths Well Counters
59, 65, 79, 116 12 96 134
X-Ray Diffraction Equipment X-Ray Emission Gage X-Ray Units
133 15 76
FIRST C L A S S PERMIT NO. 1538 NEW YORK, Ν. Υ.
BUSINESS REPLY CARD NO POSTAGE STAMP NECESSARY IF MAILED IN THE UNITED STATES
READERS' INFORMATION SERVICE Analytical Chemistry 430 Park Avenue New York 22, Ν. Υ.
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Our new 24-page bulletin No. 114-A illustrates and describes 406 items of laboratory ware fabricated from plas tic materials, some of the newer items being: • • • • • •
Aspirator Bottles, Polyethylene Centrifuge Tubes, Polypropylene and Teflon Cylinders, Graduated, Polypropylene Dishes, Teflon Filter Pump, Polyethylene Policemen, Polyethylene and Teflon
Included in the bulletin is data as to the physical and chemical properties of the various plastics, with informa tion as to the purposes for which each is most suitable. Polyethylene is now available in a higher density type than heretofore. This new type is more rigid than the former lower density type and can be used up to 100° C. Polypropylene is harder, with greater strength than either type of polyethylene and can be used up to 130° C. Teflon is the most resistant chemi cally of any material now used in lab oratory ware and can be used at temperatures from —265° to +315°C. Copy of Bulletin No. IÎ4-A sent upon request.
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