Arizona ROC CR-65 Commercial Glazing Contractor Examination Practice Questions - Arizona ROC CR-65 Glazing (Residential Commercial) Examination Exam

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Spontaneous breakage occurring months or years after installation in fully tempered glass installed on building facades is most frequently caused by which microscopic contaminant inclusion?

Ferrous oxide (Fe2O3) Nickel Sulfide (NiS) Sodium silicate crystals Calcium carbonate nodules

Correct Answer:

Nickel Sulfide (NiS)

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