Document pn0Y0vga48bn43zDmyOzNqga

FILE NAME: Keene (KNE) DATE: 1961 Aug 18 DOC#: KNE057 DOCUMENT DESCRIPTION: Inter-Office Memo RE Spray Wool & Response to Request for Information Form No. 4 cc ; Messrs . Stevens O 'Connell ^ U C. lx x. Wilson, H . E . RAI DWIN-EHRET-HILL, TRENTON, N. J. B B m INTER-OFFICE CORRESPONDENCE To: Mr. E. R. ThompsonRe : Spray Wool r Hi$. noCUM ENT CONTAINS NON-.MSCOVF.BABLF JUI !-J-'hT/Bt':no*8/ i & / & '-'TC . ;=>c- - I N THE f_ -i rno ... ~*Lr MG O' ,L/!Nut- -IV jf -r : . s c h o o l - < .ON o; P ips;.'-. - V.lNFlDFNT AGPrr-.-.r-N, w m C h '''OH -- -.S THE P P O T E C :;.. F. IPbb't '..\ T c R E r " . -E S r -.MTITLED IN RE STATE AND REGENTS Bb.^-'NG ..BE.STOS C A SES. F IL E NO 99081 AND 99032 ON I'rjOVEMBER 5. 1986. In answer to your recent request for more information concerning spray wool, we are summarizing briefly the materials used and probable mixing procedures. BEH *s spray, wool will be formulated approximately as follows: M a te ria ls Percent by Weight _.Granulated mineral wool /-SR Asbestos A Bentonite Clay C_Sodium Nitrite -- PouJJ)eTP-' o il -- spew 10' 22 ' 5 1 ' 2 It is possible that in addition to the above ingredients', two or three percent of Portland cement might also be used. LTi O tir CO P= 9 o Z X rPOJ --<J* \ Q- f suuoA.l-ov:)N3J The exact mixing procedure has not been finalized, however i t . is definitely indicated it might be desirable to blow mineral wool and the asbestos together. This gives an intimate mix and makes the product have impr.oved texture after spraying. After these materials are blown together the balance of the materials would be added and mixed in.a rotating mixer similar to that used in making finishing and insulating cements. Since the expected vol ume is considerable, it is probably advisable to mix on a con tinuous basis rather than by batches. We are experimenting using air to mix all the ingredients at the same time. It is expected that the choice between two methods of mixing will be made before the end of next after further work. together the week In developing equipment for mixing spray wool it is very important to keep in mind that asbestos dust would have to be prevented from flying in the air since it is very dangerous to health of any . operating personnel. Asbestos fiber and dust causes silicosis and every p r e ^ ^ ^ ^ g ^ ^ ^ ^ ^ ^ l g e n t the material from getting 1 n the " a 1 g ijG ED IN THE CASH *'--:T' HE- 'NGI-^EM'JE.MTSCHOOL DISTRICT NO 622 ; ij! '>.;v : . . -H.-'.'CC'.'TCN' INC E T A L .. F IL E NO C S oa . . V J'. - .......C. VHETERME OF THE C O N FID EN TA c':" 'E-" '- HICK MCOR- > . PO RATES THE P R O T E C T E E G n Ji- R i-..' '-RED IN.THE ^ C A S E EN TITLED :N R E . ST A ' AND REGENTS BUILDING A S B E S T O S C A S ES . F IL E NO 99081 AND 99082 ON N OVEM BER 5. 1986. 0340755