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How poor edge work affects the tempering process and leads to glass breakage?
How poor edge work affects the tempering process and leads to glass breakage. Here are some points to take care of:
1. Poorly finished edges often contain imperfections such as chips, nicks, or uneven surfaces.
These imperfections create localized areas of stress concentration along the edge of the glass. When the glass is subjected to the tempering process, these stress concentrations become critical points where stress is amplified.2. During tempering, the glass is rapidly heated and then cooled.
This rapid change in temperature induces thermal stress within the glass.
This stress is distributed evenly throughout the glass to strengthen it.
However, the presence of stress concentrators at the edges disrupts this even distribution.3. As the glass cools, the areas with poor edge work experience uneven stress distribution.
The stress is intensified at the imperfections along the edges, causing these areas to bear a disproportionate amount of stress compared to the rest of the glass.4. Eventually, the stress at these critical points exceeds the glass’s strength threshold, leading to failure.
This failure can manifest as cracks originating from the edges and propagating through the glass. In severe cases, the glass may shatter completely.
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