Abstract: A process for predicting the useful life of a respirator cartridge when used in an environment in which a specified toxic or hazardous organic vapor is present by measuring the weight increase of a preselected sorptive agent in a preselected geometrical configuration when exposed to a constant flow rate of a mixture of known concentration, said mixture consisting of dry air having the toxic or hazardous organic vapor dispersed therein. The invention also includes a kit consisting of some or all of the apparatus or equipment essential for practicing the present invention.

Abstract: In the sizing of textile yarns with a chlorinated solvent solution of a low crystallinity chlorinated polyolefin, undesirable tackiness of the resin size is avoided by combining the chlorinated resin with a minor proportion of a high molecular weight aromatic hydrocarbon polymer such as polystyrene. The sizing resin mixture can be recovered for reuse from a solvent desizing process.