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This Request for Information ("RFI") is seeking Sterlitech Part # 45335, Silver membrane filters specified for X-ray diffraction analyses as described below. The scan ranges free of interference inclu... This Request for Information ("RFI") is seeking Sterlitech Part # 45335, Silver membrane filters specified for X-ray diffraction analyses as described below. The scan ranges free of interference include all ranges of quartz, cristobalite, tridymite, and silver listed in the 5th edition of the NIOSH Manual of Analytical Methods, Method 7500, and most current edition of OSHA Method ID 142.