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FILE NAME Quigley QUIG DATE 1972 DOC QUIG006 DOCUMENT DESCRIPTION Letters eae 1014 Broadway Cincinnati Ohio 45202 August 31 1972 Mr. J. J. Marino Chief Engineer Quigley Company Inc. 235 E. 42nd Street New York N. Y. 10017 Dear Mr. Marino In answer to your suggestion in your letter to me of August 25 that the | comment concerning the limit of % quartz be removed represents a misunderstanding of the statement The statement merely places a limit that should not be exceeded for any mixture of the constituent of perlite or perlite products Inasmuch as you have shown by your analyses that the limit of % quartz is not exceeded your product is regarded as satisfactory from the health standpoint Sincerely yours Herbert E. Stokinger Ph.D. Chief Toxicology Branch Division of Laboratories and Criteria Development August 22 1972 Mr. J. J. Marino Quigley Co. Inc. 235 East 42nd Street New York New York 1001.7 Dear Mr. Marino Confirming our conversation of today measurements of respirable dust containing some free silica were made at two of our vermiculite expanding plants in the Fall of 1971. The TLV for the at respirable mass fraction was not exceeded the positions in the plants where the vermiculite is bagged The free silica concentration of our bagged vermiculite was found to be less than % by weight the limit of detection The Cristobalite content of vermiculite is not known as well since it is harder to detect than quartz However it is not a major impurity occurring in vermiculite deposits Its concentration must therefore also be less than % This information is not exhaustive but is the best we able and we hope it will enable you to evaluate your handling Zonolite in your plant have avail- problems in Very truly yours HCD H. C. Duecker oO Vice President CO INC RECEIVED AUG 24 1972 J. J. MARINO FILE COPY TO We hope the information given here will be helpful It is based on our best knowledge and we believe it to be true and of accurate Please read all statements recommendations or suggestions herein in conjunction with our conditions sale which apply to all goods supplied by us We assume no responsibility for the use of these statements recommendations or suggestions nor do we intend them as a recommendation for any use which would infringe any patent or copyright 212 LR 3-3444 QUIGLEY COMPANY INC 235 E. 42ND ST NEW YORK N. Y. 10017 August 25 1972 Dr. Herbert E. Stokinger Chief Toxicology Branch Div of Laboratories & Criteria Development Dept. of Health Education & Welfare . 1014 Broadway Cincinnati Ohio 45202 Dear Dr. Stokinger Referring to your letter of July 5 and our subsequent phone conversation concerning quartz and cristobalite in our asbestos insulation Panelex I have contacted our supplierosf perlite dicalite and vermiculite The replies were as follows Perlite % of product formulation Our supplier Pennsylvania Perlite Corp. forwarded a lab report by Walter C. McCrone Assoc Inc. of Chicago Ill indicating the total free silica to be less than 0.05 0.05 Dicalite 2.5 of product formulation Our supplier Grefco Inc. forwarded to us a lab report from George D. Clayton & Assoc and an article Pneumoconiosis in Diatomite Mining and Processing by USPHS Although the quartz content is less than % the cristobalite analyzed at 61 This cristobailite fraction calculates out as being 1.5 % of the total product Vermiculite 26 of formulation The attached letter from our supplier W. be less than % limit of their detection Grace indicates free silica to We must apologize for the inconvenience of reviewing this again However I feel I now know the basic requirements and hopefully in the future I can present all the data at once A Subsidiary of PFIZER INC Dr. Herbert E. Stokinger August 25 1972 Page 2 Based on the above we feel your previous opinion is still valid and only modification to your July 5th letter is to remove the ? comment concerning a % quartz content If this can be done we would be very grateful Very truly yours f J. J. Marino Chief Engineer Enclosures JJM pennsylvania perlite corporation manufacturers of perlite aggregates O. BOX 2002 ALLENTOWN PENNA 18001 -- August 10 1972 Phone 264-2891 Mr. J. J. Marino Chief Engineer Quigley Company Inc. 235 E. 42nd Street New York NY 10017 ' Dear Sir todays In reference to telephone conversation and your letter of April 18 1972. Enclosed is additional supporting data on Perlite Our sole ore suppliers are Manville and Grefco Inc. Building Products Division The test data from Grefco applies crude and expanded ore Manville's data sheet shows ore only Chemically expanded perlite is the same as crude excepting the release of H O Sincerely , yours JGS Enclosure QUIGLEY CO INC RECEIVED AUG 14 1972 J. J. MARINO FILE COPY TO RESEARCH AND DEVELOPMENT | I : SMALL PARTICLE PROBLEMS 'SOLID STATE CHEMISTRY : ' ULTRAMICRO ANALYSIS CRYSTALLOGRAPHY MICROSCOPY - nan ee : WALTER C. McCRONE ASSOCIATES INC GENERAL OFFICE 493 EAST 31st STREET CHICAGO ILLINOIS 60616 - , LABORATORIES 449-493 EAST 31st STREET STREETSTREET PHONE 312 842-7100 CABLE CHEMICRONE ca ; : _ FREE SILICA DETERMINATION IN PERLITE ORE AND PERLITE PRODUCTS Two samples submitted to McCrone Associates by Grefco Inc. on a March 13th for determination of their crystalline silica content were . examined by ray diffraction and optical microscopy We found that the free . | silica content of the perlite product 476 2FA is virtually zero that of the perlite ore labeled sample 1 is less than 0.05 oes The two samples were first examined by ray diffraction in a powder - silica diffractometer and showed no evidence of any crystalline form of free - | The limit of detecting crystalline free silica by this technique is 0.5 . _ We examined further portions of the two samples on a polarizing optical microscope classing any birefringent mineral grain as crystalline forms of . free silica Such a classification is likely to err on the pessimistic side in that most of the silicate minerals would be classed as free silica on this basis . The results of this examination showed however that the perlite ore contairs ae { birefringent less than 0.05 freesilica the few grains in the sample of _ : perlite product 476 2FA are insufficient for any significant number to be assigned to the percentage of free silica present CO Respectfully submitted Hind fy Radpl Ralph J. Hinch Jr. Research Chemist 13 April 1972 greco greco eSeee GREFCO Inc. / 3435 West Lomita Boulevard Torrance California 90503 Telephone 213 775-2781 August 10 1972 Mr. J. J. Marino Chief Engineer Quigley Company Inc. 235 E. 42nd Street New York N.Y. 10017 Dear Mr. Marino Regarding your inquiry concerning the quartz content of Dicalite tests run by George D. Clayton Associates of Southfield Michigan show that this product contains less than % quartz by weight Anytime you need any additional information please feel free to call Sincerely RBN R. B. Nielsen Civatar a a ee QUIGLEY CO INC - RECEIVED AUG 14 14 1972 J. J. MARINO FILE COPY TO poms oe ~ GGeoregeorgeGeorge D. Clayton Clayton Clayton & As ociates Associates Associates Associates As ociates _ Division of Marlennan ManagementSystems Inc. 25711 Southfield Read Southfield Michigan 48075 Telephone 313-3523120 for better OTIMITORIO ot July 12 1972 ne . - a SO OO RESEARCH & DEVELOP DEPT Mr. R. B. Nielsen 2. Research Chemist GREFCO INC 3435 West Lomita Blvd. Torrance California 90503 Dear Mr. Nielsen > 1917 4 12 972 GREFCO INC The three samples which tobalite determinations you submittfeodr quartz and cris- have been analyzed by ray dif- fractometry The results are as follows Lab No. Sample No. Quartz % Cristobalite % 30585 52 - 1.0 DL 5668 : 52R15 66.9 ' 30586 7 UF 6091 52R15 5.1 | 51.8 : : 30587 1000 Ore A 1.0 - 52R15 A 137B We trust you will find this report helpful 1.3 Very truly yours 4 Fred I. Grunder Assistant Director Laboratory Services FIG . ,