Page 455 - Handbook of Materials Failure Analysis

3 Results 453

FIGURE 17.6
GC/MS chromatograms (TIC) of (a) good functioning motor vehicle brake fluid and
(b) claimed motor vehicle brake fluid after derivatization reaction. GC/MS apparatus 2 and
analytical conditions as in p. 2.3. For peak identification, see Table 17.2.

compounds, such as tri-, tetra-, and pentaethylene glycol monobutyl ethers. The
content of the detected tri-, tetra-, and pentaethylene glycol in the claimed brake fluid
sample is greater, while the content of boric acid is by about 7.5% lower. On the other
hand, the content of the corrosion inhibitor bis(2-hydroxyethyl)methylamine in
the claimed brake fluid is about three times greater as in the good functioning brake
fluid. The obtained analytical results were then used for troubleshooting with the
customer.