Document 500pGROM0NGM6Jx8NLJbyDgYe

11 !' 1 * 'H f- April 24, 1970 A^a Kr. A. Turner Brothers Asbestos Company Post Office Box 40 Rochdale, England Dear Ronald: 1 should like to take this opportunity to thank you and your colleagues at TBA for your many courtesies during my visit. It was a pleasure to meet with you and discuss our mutual problems. 1 have started our part of the program to filter a large quantity of beer to be used in a final comparison study between our methods and especially to verify the feasibility of the X-ray method pro posed by TBA. As mentioned to Hr. Heron, it is possible that this method can be used with relatively pure substances, such as those encountered in the beer problem. However, Z an skeptical about the feasibility of the method in studying air or other samples where the fiber con centration may be in the range of 0.1 per cent to as low as 0.001 per cent of the total solid material. Xf there are any samples that we can prepare for the comparative evaluation of mired systems we shall be very happy to cooperate. Our program with tracer techniques is still underway, but not yet completely reliable. We still are finding only about SO per cent of trie chrysotile fiber that we put into calibration samples and are attempting to determine the cause of this problem. X shall yo-i infemeo ->* the results of our program as the data are : -c1, . I 1 *.t a very profitable and enjoyable naming with V . ivii -it t.JAbridge reviewing in more detail hit work on i ia-e '.ichc nut rib. Be already had e series of animals atartad jt ti micro O'.Ai'Y?., so that there is no need for me to send you y-irVje t..*., . aterial. t ri * a Mr. Donald A. Htlli fumr Brothers -2- Aprll 24, 1974 Tha results ha has obtained on 9^ia. fibr point my strongly to an aspoct ratio (L/D) affaat. Bis pictures show clearly that tha intensively nillad glass fiber is extremely short end in nany eaaas approachas tha limit of what We normally consider to be a "fiber". X an attaapting to saparata soma Coalings fibars into individual fibrils without damaging tha surfaoa or utilising any chemical additives. You nay remember that this material primarily of fibrils lass than 1/4 micron in diameter, bald to form tha fiber structure. This should serve as a of chryiotile of extremely low I/D ratio and can ba compared with ooaparabie fibciller muu.i1 of much greater length CL/D than 100) from Jeffrey. In both cases, tha material relatively free from accessory alnsrals sinoe wa will cantrifops tha material aa a final step in tha preparation. * . -K Zf we are succeesful in preparing these samples, X shall aamd fchi to you for transmittal. Again, plaasa accept ay thanks for both an enjoyable and valuable day spent in Manchester. Sincerely, S8/rs ooi Mr. G. F. Baron, Manager Turner Brothers Asbestos / beet F. L. Pundsactt S. Spall, Director Corporate, Mining t Dips Divisions & V;