Document 3QBNMvrbvOeqDrYgvQOvgoJkx

*- FRICTION MATERIALS STANDARDS INSTITUTE, INC., 210, ROUTE r4, r'rtiflwua, Me* otnsci 3w -LT ( N NO. 423 February 18, 1972 PLAINTIFF'S EXHIBIT AB-229 To: ALL MEMBERS SU8JECT: Demonstration - Membrane Filter Method for Airborne Asbestos Measurement By: iV. Reitze, Johns-Manvi 1 le Corporation. By earlier bulletins, the membership had been advised that Mr. W. Reitze of Johns-Manvilie Corporation would give a demonstration on the standard method for measuring airborne asbestos fibers. Mr. Reitze made this presentation on Thursday. February 10, 1972 at the Institute Office in Paramus, New Jersey. Those Attending; J. Greenen, President of F.M.S.I. ) R. Hemnelgarn ) ) K. Barnhardt ) J. Henning J. Graham M. Jacko W. Richards W. Reitze E. W. Drislane Mar'emont Corporation Grizzly Brake Division World Sestos Company, Division of -------The Firestone Tirei & Rubber Company Carlisle Corporation Molded Materials Division Bendix Corporation Friction Materials Division Thiokol Chemical Corporation Johns-Manvilie Corporation Friction Materials Standards Institute, fnc* MEASURING AIRBORNE ASBESTOS FIBERS Mr. Reitze discussed the earlier Impinger Method (no longer accepted) where the air sample is passed through a glass tube bubbler and the fiber is trapped with a subsequent count of fibers. The currently accepted method calls for measurement of airborne asbestos fiber by the membrane filter method. Briefly, the pick-up is worn by a worker in the area to be measured with a small battery operated vacuum pump taking in air over a specified period - of different times, say 60 minutes,' 90 minutes, or four hours. The asbestos fiber is traoped by the membrane filter and then carefully sealed and sent to the laboratory. The sample is examined using an optical micro scope where a count of fibers is made. The details of the test are described in: "Measurement of Airborne Asbestos Fiber by the Membrane Filter Method" published by the Asbestos Textile Institute. Asbestos Textile Institute P. 0. Eox #239 Pompton Lakes, New Jersey #0744-2 (Price $1.00 per copy) Thg Institute has ordered copies and will send one to each Delegate. , If additional copies are desired, it is suggested that the member order the copies directly from the Asbestos Textile Institute. C' V.'