Heat strengthened glass is a robust and durable material that is designed to provide improved safety and resistance to breakage. However, like any material, it can still shatter under certain conditions. Understanding the breakage patterns and causes of heat strengthened glass can help architects, engineers, and building owners take steps to minimize the risk of breakage and ensure the safe use of this material.
When heat-strengthened glass fails, its crack propagation behaves predictably due to its internal stress profile. Large, Radial Fragments
This process creates a surface compression layer between 3,500 and 7,500 psi. heat strengthened glass breakage pattern
When heat-strengthened glass fractures, you will observe:
There are two main breakage patterns associated with heat strengthened glass: Heat strengthened glass is a robust and durable
Used in non-vision areas where heat absorption requires thermal strength.
| Glass Type | Breakage Pattern | Fragment Size | Safety Glass? | |------------|----------------|---------------|----------------| | | Large, sharp, dagger-like shards; cracks run long distances | Large (often >12 inches) | No | | Heat-Strengthened | Large, sharp shards but with more branching and shorter crack lengths than annealed; remains partially held together | Medium to large (4–12 inches typically) | No | | Fully Tempered | Small, granular pieces (dice) – usually less than 1 inch in diameter | Very small (<1 inch) | Yes | | Glass Type | Breakage Pattern | Fragment
The glass is heated to approximately 1,100°F (600°C) and cooled rapidly.
The resulting fragments retain extremely sharp, dangerous edges.
Architects leverage the specific breakage behavior of HS glass for targeted building applications.
Heat strengthened glass, also known as partially tempered glass, is a type of safety glass that has undergone a thermal treatment process to increase its strength and durability. While it is designed to be more resistant to breakage than annealed glass, it can still shatter under certain conditions. In this blog post, we'll explore the breakage patterns of heat strengthened glass and what causes them.