TRACEY OLD HICKORY ASBESTOS DUST ANALYSIS In aid-1968 we fallowed Construction Division's lead in adopting an asbestos dust levs1 goal of 0.5 Billion particles per cubic feet (MPPCT).

(Over) SGP 0025264 Bulletin #22-6$ 3/25/65 9 * 2- - ,Please notice Price Schedule 1, page 3 effective February 8 1965 which has been changed to show that 3/8" and l/2" center taper board is not a stock item but that in the l/2" and 3/8" thickness, center taper will be made on order with a minimum quantity of 2000' on a maximum of two weeks lead time at all plants except Wilmington.

It is anticipated that the finding of clinical, electrical and laboratory improvement following the administration of pilocarpine hydrochloride may lead to a better understanding of the mechanism of damage by tricresylphosphate. -- Can.

The s tru c tu re o f tb s p a r tic le s , however and the presence of the associated carbonates and tre o o lite lead me to b eliev e t h i s is an .Ita lia n t a l c .

The relevance of magnesium analysis for asbestos is unknown and the method InvoT the use of sophisticated and expensive laboratory equipment; however, U is hoped t: the intensive study ef total and respirable mass concentrations made possible by th method, will lead to the development of a relevant and convenient mass sampling rr. .... . _. .... ....... ....................

Operations leading to problems of dust exposures during materials handling are men tioned.

I should be very sorry, indeed, to wake up some day to the recognition of the fact that the industry, as it is represented in the operations concerned with mixing lead antiknock materials with gasoline at gasoline refineries (as one example of the regular procedures involved in the distribution and use of these products) had accepted the dictum of hygienic authorities to the effect that it is unnecessary to take present precautions, since there is a much greater factor of safety than they had been led to believe.

Ws also considered that they aight be eonpounds of the pestloldes with sterol or protein material or be polymers or lntsr-oondvnaction products of the pesticides, of Experimental work failed to oonfira any of these hypotheses and baing short of etaff wc abandoned the work until we obtained a positive lead.

Asbestosis can lead to cancer in the lower lobes of the t S lung.

PCS eon effect the calcium metabolism leading to egg shell imperfections which prevents proper hatch of the young.

Of course, Tenneco Plastics has found that water and HCl will lead to the presence of soluble iron salts which can affect heat stability and result in erratic reaction kinetics with Lupersol 11 (with ferrous iron).

(Over) SGP 0025626 Bulletin #22-6$ 3/2/*5 2- - Please notice Price Schedule 1, page 3 effective February 8, 1965 which has been changed to show that 3/8" and 1/2" center taper board is not a stock item but that in the l/2" and 3/8" thickness, center taper will be made on order with a minimum quantity of 2000* on a maximum of two weeks lead time at all plants except Wilmington.

Besides obtain ing an improvement in pigment retention, mill per sonnel reported better smoothness with asbestos pres ent in the liner -- an improvement that could lead to better printability.

In addition, prolonged and repeated skin uontaot may lead to skin Irritation.

., Shell chemical Company National Lead Company Inc. 1.