175 CHEMICAL LABORATORY EQUIPMENT AND SUPPLIES 17503 * Aprons and Gloves, Laboratory: Plastic, Rubber, etc. 17506 * Bacteriological Plugging Material, Cotton or Synthetic 17508 * Balances and Accessories 17510 * Burners, Heat Guns, Hot Plates (With or Without Stirring), Mantles,etc. 17511 * Cells and Cuvettes (For Photometry and Spectrometry) 17513 * Chemicals, Laboratory (ACS, CP, Practical, Reagent Grade, etc.) 17514 * Chromatography Supplies: Developing Tanks, Glass Columns, Packing, Septums, TLC Plates, etc. 17516 * Cocktails (Solutions), Liquid Scintillation 17517 * Containers (For Liquefied or Compressed Gases), Laboratory Sizes: Dewar Flasks, Gas Cylinders, Lecture Bottles, etc. 17519 * Crushers and Grinders (Metal and Stoneware): Ball Mills, etc. 17522 * Dialysis Equipment and Supplies: Cells, Fittings, Membranes, Motors, Tanks, Tubes, etc. 17524 * Dishes, Evaporating and Other Metal Vessels (For Platinum See Class 175-71) 17527 * Electrode Sensing Meters and Electrodes: Dissolved Oxygen, pH, Specific Ion, etc. 17528 * Electrophoresis Supplies: Gel Materials, Plates, Strips, Tubes, Wicks, etc. 17529 * Extraction, Digestion, and Distillation Apparatus, Specialized: Kjeldahl, Soxhlet, etc. 17532 * Filtering Apparatus and Filters (For Liquids) 17533 * Filter Paper and Membranes 17536 * Furnaces, Laboratory 17539 * Glass Pipe and Fittings 17540 * Glassware, Laboratory, Custom-Made (Specialized Fabrication Only) 17542 * Glassware, Laboratory (Stock Only) 17544 * Glassware Washing Compounds 17546 * Holders, Glass Tube 17547 * Hydrometers and Pyconometers, Glass, Lab 17549 * Interval Timers and Actuators, Electrical and Mechanical 17551 * Ion Exchange Materials: Liquids, Resins, etc. 17554 * Laboratory Supplies: Asbestos Squares, Corks, Files, Glass Cutters, Ring Stands, Stopcock Grease, Tongs, Wire Gauze, etc. 17555 * Melting Point Apparatus 17560 * Ovens, Laboratory 17562 * Papers, Laboratory 17565 * pH Buffer Solutions, Indicators, and Papers 17567 * Pipetters and Dispensers 17568 * Plastic Ware, All Types 17570 * Porcelain Ware, All Types 17571 * Platinum Ware: Boats, Crucibles, Dishes, etc. 17572 * Precious Metals (All Forms, Including Salts): Gold, Platinum Group Metals, and Silver 17574 * Reagents and Chemicals, Ultrapure (Meeting Higher Standards than Ordinary Reagent Grade, etc.) 17575 * Refractometers 17577 * Sand, Cement Testing 17578 * Screening and Sieving Apparatus and Accessories: Riffle Samplers, Sieve Shakers, etc. 17580 * Stainless Steel Ware, All Kinds 17582 * Stirrers, Blenders, Homogenizers, and Shakers 17584 * Stoppers, Rubber and Synthetic 17585 * Syringes, Laboratory, Manual and Automatic 17587 * Thermometers, General Laboratory Type 17588 * Transformers, Variable, Laboratory Type 17589 * Tubing, Plastic, All Types 17590 * Tubing, Rubber, All Types 17593 * Water Baths and Steam Baths (Except Recirculating and Shaking) 17595 * Water Purification Apparatus and Treatments (For Distilled, Reagent Water, etc.)