Document mm1YRJNaz34Qrpdo69BoK57Kg

IMERYS Talc Imerys Talc 8051 E. Maplewood Ave Greenwood Village, CO 80111 (303) 713-5000 Fax: (303) 713-5770 TECHNICAL REPORT Project No. A11508 Date: 23-Mar-12 To: John Poston From: Carol Slowik Analyst(s): C. Slowik, J. Sulik, D. Vaccaro Copy: J. Pier, S. Sharma, G. Myers, S.Wulf PLAINTIFFS EXHIBIT CAM-353 Title: TEM ASBESTOS ANALYSIS OF HOUSTON PRODUCT SAMPLES OCTOBER 2011 Request: Three samples, representing products of Chinese and Australian ore milled at Houston, were submitted to the Technical Center for asbestos analysis by transmission electron microscopy (TEM). This analysis is in partial fulfillment of Imerys' Fiber Management Framework Program. Results: The attached TEM results were obtained using the current ASTM draft method "Standard test method for indirect analysis of talc by transmission electron microscopy for asbestos mass concentration." This method is currently being developed by ASTM committee D22.07 (Sampling and Analysis of Asbestos) and is a modification of ASTM method D 5756 "Standard test method for microvacuum sampling and indirect analysis of dust by transmission electron microscopy for asbestos mass surface loading." The modification is to adapt existing methodology to the specific analysis of talc products and/or ore samples. A program of laboratory "blank" analysis is in place and has been used to determine the detection limit for this analysis according to ASTM method D 6620, "Standard practice for asbestos detection limit based on counts." Page 1 of 4 ITA-Ratcliff-000339 Table 1. Result Summary Sample Description Grade 25 USP October 2011 A11508 TEM Analysis Results AMPHIBOLE Sample No. Number of Structures Fiber Concentration >5 um 1 <5 um 1 ppm A 1 1 5 0 8 -2 0 0 BDL 11 CHRYSOTILE Number of Structures Asbestos Concentration >5 um 1 <5 um 1 ppm 00 BDL 11 BDL = Below detection limit, as defined by ASTM D 6620 Page 2 of 4 ITA-Ratcliff-000340 Table 2. Analysis parameters Sample Description Grade 25 USP October 2011 Sample No. A 1 1 5 0 8 -2 A11508 TEM Analysis Parameters Starting Weight g Aliquot Filtered mL Grid Spaces Analyzed # Total Sample Analyzed ng AMPHIBOLE Analytical Detection Sensitivity* Limit ppm ppm CHRYSOTILE Analytical Detection Sensitivity* Limit ppm ppm 0.2529 0.4 10 97.4 0.010 0.06 0.006 0.04 ` Analytical Sensitivity is defined by ASTM D 5756 as the detection of one structure with minimum dimensions. Page 3 of 4 ITA-Ratcliff-000341 Table 2. Analysis parameters Sample Description Sample No. A11508 TEM Analysis Parameters Starting Weight g Aliquot Filtered mL Grid Spaces Analyzed # Total Sample Analyzed ng AMPHIBOLE Analytical Detection Sensitivity* Limit ___ ppm___ ppm CHRYSOTILE Analytical Detection Sensitivity* Limit ppm ppm Page 4 of 4 ITA-Ratcliff-000342