The testing machine rotates either the disk or the pin relative to the disk's center. This creates a circular sliding path on the disk surface.

During the test run, sensors measure the friction force, normal force, vertical displacement, and time.

Complete Guide to the ASTM G99 Pin-on-Disk Wear Test Standard

The limitations of ASTM G99 include:

The PDF loaded on the large monitor. It looked dry—pages of technical jargon, diagrams of test rigs, and tables of variables. To a layperson, it was gibberish. To Elias, it was a map of the minefield.

Sarah scrambled through the paper report. "No... they just marked it as 'stable'."

"Whose standards?"

Elias looked at the clock. It was 11:00 PM. The legal team wanted answers by morning. "Open it."

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