Measuring and testing – Moisture content or absorption characteristic of material
Patent
1979-08-01
1980-12-09
Woodiel, Donald O.
Measuring and testing
Moisture content or absorption characteristic of material
55270, G01N 502
Patent
active
042377269
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.
REFERENCES:
Ruch, W. E., G. O. Nelson, C. L. Lindeken, R. G. Johnsen and D. J. Hodgkins: Respirator Cartridge Efficiency Studies I. Experimental Design, Am. Ind. Hyg. Association J. 33:105-109 (1972) describes a system designed to determine the service life of respirator cartridges in atmospheres containing organic vapors.
Nelson, G. O. and D. J. Hodgkins: Respirator Cartridge Efficiency Studies II. Preparation of Test Atmospheres, Am. Ind. Hyg. Assoc. J. 33:110-116 (1972) indicates how various test atmospheres can Be prepared which have known concentrations of solvent vapor in humidified air.
Nelson, G. O., R. E. Johnsen, C. L. Lindeken and R. D. Taylor: Respirator Cartridge Efficiency Studies III. A Mechanical Breathing Machine to Simulate Human Respiration, Am. Ind. Hyg. Assoc. J. 33:745-750 (1972), describes a mechanical breathing simulator which can be utilized in a system to determine the service life of respirator cartridges.
Nelson, G. O. and C. A. Harder: Respirator Cartridge Efficiency Studies IV. Effects of Steady-State and Pulsating Flow, Am. Ind. Hyg. Assoc. J. 33:797-805 (1972), evaluates the effects of steady-state and pulsating flows with regard to the service life of respirator cartridges.
Nelson, G. O., and C. A. Harder: Respirator Cartridge Efficiency Studies: V. Effect of Solvent Vapor, Am. _Ind. Hyg. Assoc. J. 35:391-410 (1974), describes the effective service life of respirator cartridges when tested with a number of different solvent vapors and gases.
Nelson, G. O. and C. A. Harder: Respirator Cartridge Efficiency Studies: VI. Effect of Concentration, Am. Ind. Hyg. Assoc. J. 37:205-216 (1976), evaluates the effect of various vapor concentrations on the service life of respirator cartridges.
Nelson, G. O., A. N. Correia and C. A. Harder: Respirator Cartridge Efficiency Studies: VII. Effect of Relative Humidity and Temperature, Am. Ind. Hyg. Assoc. J. 37:280-288 (1976), is concerned with the effects of relative humidity and temperature on the service life of respirator cartridges.
Nelson, G. O. and A. N. Correia: Respirator Cartridge Efficiency Studies: VIII. Summary and Conclusions, Am. Ind. Hyg. Assoc. J. 37:514-525 (1976), describes the summary and conclusions of previous work as well as presenting various theoretical interpretations of solvent vapor adsorption on activated carbon.
Nelson, G. O., L. E. Swisher, R. D. Taylor and B. E. Bigler: Preparation of Mixtures of Humidified Air with CO, SO.sub.2, NO.sub.2, NH.sub.3, NH.sub.2 CH.sub.3, Cl.sub.2, and HCl to Measure Respirator Cartridge and Canister Service Life, Am. Ind. Hyg. Assoc. J. 36:49-56 (1975), describes the preparation of various humidified air and contaminant gas mixtures.
NIOSH Research Report, Development of Improved Respirator Cartridge and Canister Test Methods, HEW Jul. 1977 reviews some of the literature and findings pertaining to the prediction of service life and adsorption capacity of respirator cartridges and canisters.
Beaumont Gerald P.
Johnson Bruce P.
Peterson Robert L.
The Dow Chemical Company
Woodiel Donald O.
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