LEAD INDUSTRIES ASSOCIATION CAST !

THg LEAD DPOSTRT PI UT1H, NEVADA, AMD CAUTOHSIA* T.

LEAD INDUSTRIES ASSOCIATION CAST !

Sufficient quantities of lead were found in the air samples in two of the operations, such that blood lead analyses were thought necessary.

Dear Philip: I hasten to reply at once to your letter of July 3rd concerning the possibility of the use of tetramethyl lead in gasoline in order to improve the distribution of lead throughout the cylinders of the internal combustion engine.

LIA16211 LEAD INDUSTRIES ASSOCIATION ~------- 4S0 kBONOTON AVPM NCWVONK IT, M.

Dear Philip: I hasten to reply at once to your letter of July 3rd concerning the possibility of the use of tetramethyl lead in gasoline in order to improve the distribution of lead throughout the cylinders of the internal combustion engine.

Som etim es this is m istakenly thought to be tetraethyl lead intoxication, sines the excitation due to gasolin e, lik e that associated with the ea rly stages of a n a esth esia , m ay resem b le tetraethyl lead intoxication to som e slight extent.

The examinations showed the blood lead level was low.

THg LEAD DPOSTRT PI UT1H, NEVADA, AMD CAUTOHSIA* T.

Table Brake Lining Ingredients Fillers Reinforcing Chrysotile Asbestos Nonreinforcing Bariem sulphate Calcium sulphate White lead Lead carbonate Clay Asbestine Friction Modifying and Wear Enhancing Agents Curing Agents and Accelerators Cashew nut liquid products powders Rubber and synthetic rubber Ground rubber tire scrap Iron oxide Metals zinc brass Lead salts Tale Graphite Bituminous materials Abrasives Standard rubber and resin primary and secondary curing agents and accel- erators ~ - - _ --- 20 SAE JOURNAL | anewiag os ^'e i BRAKE LINING MATERIAL Ingredients Hold Key To Service Behavior eter of the smallest fiber which can be separated is about 0.00003 in Asbestos makes a good friction material because of its heat resistance chemical resistance flexibil- ity low thermal conductivity and hardness Its reaction to heat is particularly important The asbestos fibers start losing their water of ee crystallization at about 600 F.

* A lead-in-air test made in the remaining tank indicated onl; a trace of lead in the atmosphere.

Lead compounds have boen thought of in this connection, and a number of questions have been raised.

Lead arse nate, he said, once was used in a type of whitewash paint.

M oreover, the relationship betw een the con cen tration of lead in th e a ir and the reten tion of lead in the lung is a bit too ill-d efin ed , at p resen t, to ju stify any flat statem en t or calcu lation from the one to the o th er.