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Home • About Us • Laboratory Services • Forensic Science Communications • Back Issues • April 2008 • Technical • Table 2: Results of Group 2 Testing

Table 2: Results of Group 2 Testing

Table 2 provides the results of Group 2 testing. No significant differences were observed in Group 2 epoxy FTIR spectra. Calcium carbonate was observed by PLM in all Group 2 epoxies but did not yield discriminating data. Barium sulfate was identified by XRD in J-B WELD and J-B KWIK epoxies, but not in Metal/Concrete Epoxy.  Barium was identified by XRF in J-B WELD and J-B KWIK epoxies, but not in Metal/Concrete Epoxy. J-B KWIK exhibited a distinguishable pyrogram from both J-B WELD and Metal/Concrete Epoxy.

Group 2 (Opaque/Gray in Color) Results

 

J-B WELD

J-B KWIK

Metal/Concrete Epoxy

FTIR

No Significant Differences in Spectra

PLM

CaCO3

XRD

CaCO3
BaSO4

CaCO3
BaSO4

CaCO3

XRF

Mg*, Si, S, Ca, Ba, Fe, Zn

Mg*, Si, S, Ca, Ba, Fe

Mg*, Si, S, Ca, Fe*

Pyr-GC/MS

 

Distinguishable Pyrogram

 

*Weak peak