Z would like to think that our afforte In lnatreating ueem to take preeautlona to avoid expoaura have been eueoeaaful and hove lead to generally favorable lnduatrlal axperlanee with theca aaterlala.

and la playing a leading rale la gathering health Information eo its aembers.

Plastics can cause 3 types of respiratory accidents* (1) Acute and subacute intoxications due to inhalation of volatile substances released from decomposing plastics or during synthesis _ acuta trachoo-bronchitis and pulmonary edema. (2) Chronic broncho-pneumopathies following repeated inhalation of dusts or suspension of plastics _ pneumoconioses and thesaurismoses leading to pulmonary fibrosis. (3) Broncho-pneumopathies related to the irritant and sensitizing action of some components of plastics _ occupational , asthma and sensitization pneumopathies.

In preparation for the presentation of a paper on a ''Toxicological Appraisal of Lead" (in tne air) I, who have worked in this field for many years, and am fairly well informed as to the details, as well as the major Issues, spent almost three months in reviewing the publisned literature on tne subject during the past ten years (or thereabouts), making copious notes for my ow.> purposes, before writing a line, I could not afford to omit anything of real significance that might well have escaped me while engaged in my own work.

The analysis . of the data will lead to the initial determination of the role of the industrial nurse with regard to employee mental health and also determine course content for future programmed instruction in this area.

Dember <he did not put it so, but that is what he meant, with a proper shading of courtesy) in the matter of your proposal to carry out some experiments on the behavior of animals under the influence of certain organic compounds of lead.

Other common causes are improper maintenance of drinking and cooking facilities and improper installation of plumbing facilities, permitting back-siphonage of used water The integrity of the drinking water sys tem must be mamtamed throughout the plant If there are piping systems contain ing water used for other purposes, such as sprinklers and fire hydrants or manufactur ing processes, each should be clearly identi fied, particularly at outlets There should be no direct connection between drinking water and other water systems Long dead end runs of pipe which cannot be Bushed or drained and which might serve as a reser voir for contaminated water should also be eliminated Plumbing Fixtures and faucets should be installed to prevent back-siphonage of contaminated water if the pressure drops m the supply Une Faucets and similar outlets should be at least 1 in above the floodrun of the re ceptacle beneath To prevent backflow into the drinking water supply, surge tanks and air gaps may also be required in the drain age lines from process equipment Open joints in underground supply hues into which ground water or water from leaky sewers can seep are another common source of contammabon This condibon may arise where pipes are subject to vibra tion or corrosion and the joints between pipes open mechanically or the pipe secbons crack Codes usually prohibit sewer and drinking water lines to be installed in the same bench, unless the sewer bne is placed at a much greater depth and a cer tain horizontal offset provided Frequently, contammabon results when a system is opened for repair or the addibon of new pipe and is not disinfected before being put back into service If the supply for sprinklers and fire hy drants is the same as that for drinking TABLE 37-A RECOMMENDED LIMITING CONCENTRATIONS OF CONTAMINANTS IN DRINKING WATER Undesirable Substance Concentrations above which water should not be used if other sources are available (mff/L) Alkyl benzene sulfonate Arsenic Chloride Copper Carbon chloroform extract Cyanide Fluonde Iron Manganese Nitrate Phenols Sulfate Total dissolved solids Zinc 05 001 250 1 02 0 01 See Table 37-B 03 0 05 45 0001 250 500 5 Dangerous Substance Arsenic Barium Cadmium Chromium (hexavalent) Cyanide Fluonde Lead Selenium Sih er Concentrations above which eater supply should be re jected (mg/L) 005 10 0 01 005 02 See Table 37-B 005 001 0 05 From Dnnktnff Water Standards U S Public Health Service 1962

Theae doaea lead aa ta the eonalualon that Aroelor 101 la not partleularly toale froa the ataadpelnt of acci dental ingoatlaa or aaaalva akin axpeaaro.

In that letter he states that NEMA Is considering changing the Industrial Control Standards parts 43 and 44 to specify in part "The holding brakes for hoist motors with control braking shall have a rated torque of not less.than 150$ of the full lead hoisting torque at the point where the brake is applied".

This leads to the rush orders.

You cold ovor tic telephone tliat you had ovidenoo to buyout tliat t)io leahege oocura in the valley of tha hivor Vithan, and I am diSvX'ctoJy following up tl.ia lead.

Coat: Guard and Maritime Administration* This could possibly lead toward the acceptance of mineral fiber pipe insulation* duct board and duct liner by these agencies.

If this is done he believes there will be little trouble, but if it is not done properly it may react badly upon the entire issue of the use of lead in any form in gasoline.

Kehoe, Thank you for your very interesting letter about lead poisoning.

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