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S e p te m b e r 11 1974
M" Ray R, K ram m es W hittaker, C lark & D aniels, Inc. 100,0 C o o lid ge S tr e e t , South P la in fie ld . N , J . 07080
Dear M r. Kram m es:
With re fe re n c e to your le tte r of 8 /2 9 /7 4 , e n c lo se d a r e DTA th e rm o g ra m s for talc sam p le s A , B , C and a blank run, i. e. , alundum referen ce a s sam p le v s , alundum re fe re n c e . To keep the c u rv e s on sc a le and still u se v e ry high se n sitiv ity in the 800-900C ran ge, we used 150 m icro v o lts on the Y a x is at the begin n in g and m idd le of the ru n s, then sw itch ed to 40 m icro v o lts. The alundum v s, alundum run w as done at 40 m icro v o lts throughout.
A s in the u su al DTA p resen tatio n , an exotherm is seen a s a poak above the baselin e, and an sndotherm is a negative peak. Sam ple A w as done tw ice, and the peaks w ere duplicated very w ell.
With regar,d to the te m p e ra tu re range w here ch ry so tile exhibits a peak {840 -8 5 0 C ), Sam ple A i s the only one which show s a sm all exotherm p eak ing a t ca,, 85'0t' C. P o s s i b ly tin a i3 due to c h r y s o tile . We cannot s a y , h ow ever, how m uch is p r e se n t, if any, u n less the sy ste m i s ca lib rate d with known amounts of chrysotile.
P le a se fe e l fr e e to call if there is any question o r if we can bo of furth er assistan ce.
Sincerely yours,
PLAINTIFF'S EXHIBIT
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D eB E L L & RICHARDSON, INC.
fe y i i y Myer E zrin , Ph. D ., M anager A nalytical Services D & R TESTIN G INSTITUTE
DeBELL & RICHARDSON TESTING INSTITUTE * ENFIELD, CONN. 06082 * PHONE 203 749-8371
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