Asbestos TEM analysis results, Oct 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5741 - 10/23/01 Lab Sample Nc. 61999 Filter Type .MCE 25 mm Operator Client Spl. No. 40-9 Filter Area 385 Instrument I.D. EM 10 CRX Grid I.D. Disk No. Screen Magnification 16,4QQX (GO) Area 0.01124 iT>m^2 Comments Acc. Voltage 80 kV No. GO to be Analyzed _4 ( 3.147 Struct. Corspd. to 70 s/mm^2.}

GO. Structure structure Type Length I.D. of Structure EDS >0.S um (Nonasb. No Coord. No. F B c M > Sum Chrys. Amphibole Nonasb. Ambig./ND Elements)

I w < 5 um

II //

^0 —

'“1

Photo No. (from 1 in 3 asbeetoa- Identify all structures using EDS Check diffraction for asbestos store all unrepealed spectra cont^ining samples) Grid acceptance:! structures up to TOs/mn (let 4) <S0X undissolveo filter, overlapped or folded Struct, s > O.Sum > 5:1 Aspect Ratio <10X particulate coverage >50X coverage Totals Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Positive diffraction pattern properties conforming <5% holes or opaque areas_____________________ F B C M > Sum to laboratory identification criteria observed. ■Unused portion For chrysotile: 0.73nm spacing for (020) rsnectlons, O.SSnm spacing for the layer line repeat, streakini of filter Chrysotile of (110) and (130) reflections. -Avoided portion of fllUr For amphiboles: 0.93nm layer Une repeat, and approx. PorUon □( niter (2mm wide) 3.5 ratio of nan-twinned layer line spot spacing to lubject to axaminaUon Amphibole layer line repeat distance (0.53nm). v*^ EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous Fw Single Fiber (1-3 intersections s 1-3 fibers) Amosite B= Bundle (>3 fibers <L fiber diameter apart) C= Cluster (>3 intersections) f ____________ 25mm filler Crocidolite Non-asbestos Matrix r Slopping Rules: I--------- - Anthophyllite NSD= No Structures Detected >S0 s/C.O. ar in lit 4 G.Q. Tremolite Non-Identified L:\DATA\PR1VATE\UIK5C\CADOVEM3 9/22/90 Actinolite

NYC-WTC_000174909