Question 1

What is the thermal shock test for glass?

Accepted Answer

Thermal shock testing assesses glass containers' reaction to abrupt temperature fluctuations. These alterations may occur when hot liquids are poured into cold containers or vice versa, subjecting the containers to extreme temperature swings.

Question 2

What is the temperature difference for glass thermal shock?

Accepted Answer

Float glass can be thermally shocked at merely a 40-degree temperature differential. The typical toughened glass made by IQ can tolerate temperature variations of up to 200 degrees across its surface.

Question 3

What materials are resistant to thermal shock?

Accepted Answer

Fused silica (synthetic quartz or silicon oxide, SiO2), cordierite, and silicon nitrides (Si3N4) have very low thermal expansion coefficients, making them relatively resistant to thermal shock.

Question 4

Why do some glass types have higher thermal shock resistance than others?

Accepted Answer

Glass types with lower thermal expansion coefficients (borosilicate, fused silica) develop lower thermal stresses for a given temperature differential — providing higher thermal shock resistance. Soda-lime glass (standard container glass) has a higher expansion coefficient and lower thermal shock resistance than specialty glasses.

Question 5

What is the progressive thermal shock test in ASTM C149?

Accepted Answer

The progressive test increases the temperature differential incrementally, testing groups of containers at each level until a defined percentage fractures. This establishes the temperature differential at which a specific fraction of the container population fails — providing a statistical characterization of thermal shock resistance distribution rather than a single pass/fail result.

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