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(S5) < (3 v=3 L-----J k5> i e\ -*2< d BACKGROUND ON THE CONCERNS OF ASBESTOS IN BUILDINGS Asbestos is the general name -for a group of naturally occur ring silicate minerals that separate into strong, very fine fib ers.

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IWWUM-MWW mi u s Epidemiology First well documented case of pulmonary asbestosis reported in 1906 in an asbestos textile worker, the sole survivor of 10 men in an asbestos carding room.

Safety Engineering Tables TABLE 47-T (concluded) Type of dust Ignition temp of dust cloud (degC) Mm spark energy required for ignition of dust cloud (milhjoules) Min ex plosive concen tration (os per 1000 cu ft) Max explosion pressure (pit) Aotef of pressure nse (psi per sec) Aug Max Limiting oxygen percentage to prevent igmtion of dust cloud by electnt spark* Pitch coal tv (58% vol matter) Procaine penicillin Rubber crude, hard Secobartital sodium Soap Sodium afkylarylsudonate Sodium benzoate Sodium carboxymethyl cellulose Sorbic acid Sulfur Vitamin B, Wood flour 710 20 35 95 1900 6000 15 450 25 50t 1 000 2000 350 50 25 60 1 200 3800 15 520 95 105 55 250 500 430 60 45 85 600 1.750 540 130 7St 400 1 250 560 60 55 85 1800 10000+ 350 560 150 60 300 600 470 f5 25 90 3000 10000+ 190 15 35 80 1 700 4,750 11 500 60 105 80 1000 2250 430 20 40 110 1,600 5,500 17 From Mechanical Engineers' Handbook, rev 6th ed Edited by T Baumeister (Copyright 1958 McGraw-Hill Inc) Used by permission When uranium, uranium hydride, and zirconium were dispersed into air at room temperature, the dust clouds ignited under some conditions tThe oxygen reduction data in this table are based on tests made in air-CO, mixtures Dust clouds of thorium, titanium, uranium, zirconium Dowmetal, and certain magnesium and magnesium-alloy powders ignited in pure CO, ^Pressure and rates of pressure nse for these dusts were measured by an older testing technique TABLE 47--U NATURAL TRIGONOMETRIC FUNCTIONS Angle 0 1 2 3 4 5 Function sm cos tan tan cos tan sin cos tan stn tan sin tan Value Angle 00000 10000 00000 00175 09998 00175 0 0349 09994 00349 00523 09986 00524 00698 09976 00699 0 0872 09962 00875 6 7 8 9 10 11 Function Value sin 01045 cos 09945 tan 01051 sin 01219 cos 09925 tan 01228 sin 01392 cos 09903 tan 0140$ sin 01564 cos 0 9877 tan 01584 sin 01736 cos 09848 tan 0 t763 sin 01908 cos 09816 tan 01944 Angle 12 13 14 15 16 17 Function sin COS tan sm COS tan sm COS tan sin cos tan sin cos tan sin cos tan Value Angle Function 02079 09781 0 2126 0 2250 09744 02309 0 2419 0 9703 0 2493 0 2568 09659 0 2679 02756 09613 02867 02924 09563 03057 18 19 20 21 22 23 sin cos tan sm cos tan sm cos tan sm cos tan sm cos tan sin cos tan Value 03090 09511 03249 03256 09455 0 3443 0 3420 0 9397 0 3640 03584 09336 0 3839 03746 09272 04040 0 3907 09205 04245 1612