lead reference sheet (part I) JTtmylrm U.

1953 ANNUAL INDEX Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING CHEMICAL TOXICOLOGICAL INDUSTRIAL HYGIENE FOUNDATION MELLON INSTITUTE 4400 FIFTH AVENUE PITTSBURGH 13.

(Alveoli are air sacs deep in the lung where gas exchange takes place; damage in this region, caused by deposited dust particles, may lead to pneumoconiosis).

Our Titanium pigment manufacture is proving profitable and Cadmir.m pigments continue to lead in this field. 1 | NAVAL STORES DIVISION: t j This division, with plants at Jacksonville, Florida, and Valdosta, Georgia, has continued its intensive research on rosin based specialties and terpene products and the results are beginning CLDOo ?

Bain made a marked sucoess by his efforts, especially in the sale of brushes, linseed oil and white lead.".

Certificate of Organization of National Lead Company AS AMENDED OCTOBER 17. 1951 !

Joyce himself suggested, and took the lead in executing, the promo tion that "set the paint industry on its ear."

4 ttS^r-V/is: N 2212 of present relstlvelj high lead Inventories Mc*iiry (by the feathering actbod) In tbe oannfacture of white lead.

Titanium $0% Leaded Zinc 2hH 1>t IH-1% ti.1* 97.

th e ''stip p lin g " is done p a rtly in d e fe ren c e to the high b u t undue re g a rd in which th is te s t is h eld (with re s p e c t to lead ab so rp tio n ) in m ed ical and m e d ic o -le g a l c irc le s .

1953 ANNUAL INDEX Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING CHEMICAL TOXICOLOGICAL INDUSTRIAL HYGIENE FOUNDATION MELLON INSTITUTE 4400 FIFTH AVENUE PITTSBURGH 13.

Our Titanium pigment manufacture is proving profitable and Cadmir.m pigments continue to lead in this field. 1 | NAVAL STORES DIVISION: t j This division, with plants at Jacksonville, Florida, and Valdosta, Georgia, has continued its intensive research on rosin based specialties and terpene products and the results are beginning CLDOo ?

Seeman ate ee 2 The compounding of friction materials that successfully meet all these requirements is the specialty of some of the anonymous heroes of the automotive industry The uninitiated might think that with a stable brake design and evaluation reduced to simple terms the friction material compounder's job would be routine This is far from the case The many influences on brake performance resulting from variations in vehicle weights climates road conditions vehicle equipment and : driving habits make the engineering of brake lining friction materials a most chal- lenging assignment is the guarded commonly throughout and a highly secretive operation The formula of a brake lining secret of the supplier while other brake components are used the industry - BASIC DRUM AND SHOE BRAKE DESIGNS For purposes of clarity all data presented herein applies to a drum and .. shoe brake of the servo type Fig 1 The two other drum and shoe brake de- signs generally employed are the two leading shoe type and two trailing shoe type Fig 1 There is also a one leading one trailing shoe type in general use which is not shown ORGANIC BRAKE LININGS Al American passenger cars use organic brake linings There are two organic linings which are classified by their method of fabrication Organic dry mix is basically a white compound of asbestos filler materials and powdered resins which is thoroughly mixed preformed to shape and placed under heat andand pressure until it forms a hard slate hoard Then it is cut and bent into in- dividual arcuate segments and attached to the shoe Organic wet mix is a compound of asbestos organic fillers and liquid resins that has a brown color when blended The compound is processed by any of several different methods which include high pressure extruding screw extruding calendering and other processes Figure 2 shows a step in the high pressure extruding process The extruded lining is being removed from a die that has formed it into a long slab that will be compressed to a uniform density under heat and pressure Organic Linings are generally composed of six basic ingredients Asbestos with its high heat resistance and high coefficient of friction in contact with Iron and steel is the basic material Friction modifiers such as the oil of the cashew nut shell give linings desired fiction qualities Fillers are a wide variety of materials such as rubber scrap which are added to linings to control noise wear or other brake characteristics Curing agents and accelerators are added to a lining compound to produce required chemical reactions in the ingredients Materials for special effects are added to compounds to improve overall braking performance They include powdered lead brass chips and aluminum powders Binders which are predominantly phenolic resins hold all the other ingredients together and are selected to govern the physical strength of the material at high temperatures What's new in brake linings_1959_substitutes.max linings_1959_substituteslin.gs_19m5_subastiutxes.max 3 Organic brake linings have several distinct and important characteristics regardless of how they are compounded 1 The fabricating cost is low in general 2.

1953 ANNUAL INDEX Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING CHEMICAL TOXICOLOGICAL INDUSTRIAL HYGIENE FOUNDATION MELLON INSTITUTE 4400 FIFTH AVENUE PITTSBURGH 13, PA. .n -i - j cl Pulrr.onarv Asbestosis, with Ita Devel;snc: Fob owed by X a . u .t ; Pj st-Morten Stacy.

National Lead Co. ol Ohio Mt.