Abstract: A method and apparatus for sampling chemicals prevents exposure of laboratory personnel to the chemicals being tested and to volatile solvents or chemicals that may be mixed with the tested chemicals. The apparatus includes a sampling line connected to the source of the chemicals, a cooling means for reducing the temperature of the chemicals, and a sample holder for containing the sampled chemicals. In the method, the chemicals are removed from their source, cooled, and contained in the presence of a shortstop chemical, i.e. a chemical designed to terminate any chemical reaction that may be taking place when the chemicals are sampled. The apparatus also captures and contains any volatile solvents or chemicals that may be mixed with the chemicals being tested.

Abstract: A method and apparatus for sampling chemicals prevents exposure of laboratory personnel to the chemicals being tested and to volatile solvents or chemicals that may be mixed with the tested chemicals. The apparatus includes a sampling line connected to the source of the chemicals, a cooling means for reducing the temperature of the chemicals, and a sample holder for containing the sampled chemicals. In the method, the chemicals are removed from their source, cooled, and contained in the presence of a shortstop chemical, i.e. a chemical designed to terminate any chemical reaction that may be taking place when the chemicals are sampled. The apparatus also captures and contains any volatile solvents or chemicals that may be mixed with the chemicals being tested.

Abstract: Angled scraper blades provided on the end of a screw shaft of an extruder provide thrust for propelling polymer toward the die opening of the extruder. The scraper blades help prevent trapping of polymer between the shaft and the die plate of the extruder, which trapping can lead to scorching, burning or break down of the polymer.