Why does tempered safety glass break into small granular pieces rather than long sharp shards?
Correct Answer
A) Its surface compression from heat treatment changes the break pattern
Tempered glass is heat-treated to create surface compression, which increases strength and changes its breakage pattern into small granular pieces. Other choices describe wired or laminated glass, or frame effects.
Why This Is the Correct Answer
Tempered glass is heat-treated to create surface compression, which increases strength and changes its breakage pattern into small granular pieces. Other choices describe wired or laminated glass, or frame effects.
Why the Other Options Are Wrong
Option B: Use tempered glass to contain wire mesh
Choice B (It contains wire mesh) is rejected because it answers the Tempered glass prompt with the wrong practical move.
Option C: Use tempered glass to be always laminated to plastic
In doors, windows, and glazing, It is always laminated to plastic is the wrong selection for Tempered glass: it leaves out the controlling Tempered glass result: Its surface compression from heat treatment changes the break pattern.
Option D: Use tempered glass to have a thicker aluminum frame
The trap in D is It has a thicker aluminum frame. That selection is wrong because the choice would not get the project to Its surface compression from heat treatment changes the break pattern, which is the Tempered glass result verified by the source; Tempered glass has surface compression from heat treatment and breaks into small granular pieces.
Memory Technique
Keep tempered glass as a cause-to-effect card with Its surface compression from heat treatment changes the break pattern on the back.
Reference Hint
Open Principles and Practices of Commercial Construction, 11th Ed., 2024; use the index entry or section for "Safety glazing material behavior - tempered glass" to confirm that Tempered glass is heat-treated to create surface compression, which increases strength and changes its breakage pattern into small granular pieces.
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