Document 0qoobVy1NEdyoRXLaxD0GgRpd

ory nto r.stanrej ould 1** requ-nt ploy sew ut su;h arc not isaims. -e often actusanie wiui air quantities uepenurot upon the open *.rea in tlie hoo<l. T,. prevent contamination resulting from volatilisation of lead accumu lating in the combustion cliaml>er the products of combustton from gas fired lend pots jhoultkbe vent'd to the outdoors and not be allowed to dissijut* into the workroom. Asbestos Asbestos used ir. the formulation of brake lining is n potentially harm ful compound. This material is the ..(T-nding ugent in the production of the lung ailment known as arbealonin. The harmful effect is comparable to dial of silica and a permissible limit of 5.000.000 particles of asbestos dust per cubic foot of air is generally rn ognized. Dust ex|Ksures to a<drf*!-lo* and other ingredients of the brake lining exist when tlie dry materials arc handled and emptied into the mixers and in the subsequent operations of slitting, grinding, or surfacing. Com pounds of lead are sometime* used in brake linings, and contamination from this source should not l>c ig nored. Local exbiiust systems with properly designed hoods or enclo sure* are used to remove the dust from these ojierations. Iron Foundries The principal ingredients uf foun dry dusts are silica, sea coal, clays, and parting compounds. The pre dominant material will be dependent upon which phrase of the foundry op eration is I>ei:ig studied and what operation is lieing performed. The control of dust is the major problem, whereas fume is of secondary impor tance. A discussion of all the aspect* of thi- industrial hygiene problems in 'i:eh plants would require h separate treatise. For the present discussion it should be sufficient to state that all obvious sources of dust dispersion should be reduced to a minimum b\ adequate localized exhaust systems. In a mechanized foundry such places would be sand conditioning and mix ing equipment, tumbling mills, shakeouts, core removal nnd knockout sta- tior.s, transfer points of dry &JUld, aurasive blasting open lion?', and all grinding operations performed on castings containing appreciable quan tities of sand. Maintenance of ventilation equipmeat is a major item in foundries because of the abrasive action of the duaL It is ini|>erative that a good program be maintained so is to keep the equipment functioning at maxi mum efficiency. t .. Because of the heat associated with large scale foundry Activities it is a common sight to ler pedestal fnn or air cooling du-ta directed in web a manner us to create crow dtafts which interfere with the efficient re moval of dust Better placement of Iltrac (.ini or ducts will go fir ill re ducing dust concentrations in the area* where thi;y are used. Respiratory iftotoctiv Devlcts After tlie ob.ious has been correct ed. it ia advisable that a purvey of the foundry* be made by an industrial hygienist jo that an accurate cvnloalion of the exposure may be ob tained. As liar- bora `tated, the atmospheric that workers will weeir because they're No, the glamor gal's catch all and the upper right hand cache may be full with the accumulation of years, the pocket may bulge--but you won't find lightweight SafeT-vis there. Not during work ing hours you won't /' The weight of two Safr-T-vii Icnv-S, made from a new allyl casting resin, is approximaicR' the same as that of on* case hardened glass lens of the same siae. 8-HOUR Comfort Workers find Sale-T-vis. light weight, attractive nnd comfort able. What a change from old type goggles whose weight causes work ers to removp them chancing ex posure to hazard! 8-HOUR Protection Real protection comes cnlv when goggles ale worn throughout the jx-riod of exposure. And complete protection is tin* only function of any safet> goggle. Anil Hi/ or SAFE Standard drop-hall tests prove Safo-T-vw* superiority over ordi nary eye protection. Safc-T-vis offers greater.-csistancr to abrason than do Other plastic lenses. It re sists the stress* \ of high velocity im pact, corrosion and other causes pf industrial eye injury to ilic mart exacting spccificatioas. Write for booklet giving com plete details. * Lightwlghl profccf/vc tpKladti r. *< rwt vhihs uns com'imy, t, ou> NcUoo*I Sdty II twt, February, 194t } f t 1; T -V i; 1 ' SI