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You are here: Home / Failure Analysis / Borosilicate Glass Failure Analysis, Coffee Press Carafe Failure

Borosilicate Glass Failure Analysis, Coffee Press Carafe Failure

January 1, 2025 By Tom Read Leave a Comment

Overview of Coffee Press
Photo micro graphof the crack origin. The failure originated at a damage site on the carafe interior at the heel. This is the origin on the bottom piece (Mag. 20X).
Close up of the crack at the bottom of the press at the heel
Fracture origin on the carafe body.

At Read Consulting borosilicate glass expert has extensive experience performing borosilicate glass failure analysis. In addition, studies have been performed on glass composition and thermal shock testing. This includes testing first articles of various parts from overseas suppliers. Items tested include oven doors, glass oven ware and various glass carafes. Borosilicate glass has a lower coefficient of thermal expansion, and this makes it., when fully annealed, more resistant to thermal shock. On the other hand, its impact resistance is identical to soda lime glass. Thin-walled containers, such as coffee press carafes, can be readily damaged by metal spoons. At the damage site the stress is  concentrated. This causes normal forces to cause a crack to grow to failure.

In this example, the subject carafe ( 2.5mm thick glass) was damaged on the inside wall at the heel, Subsequent use caused a crack to grow to failure. It appears as if a hard object, such as a metal spoon, caused the damage. Do not stir the contents with a hard object.

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Read Consulting Failure Analysis

Thomas L. Read, PhD,
1435 Fulton Road Santa Rosa, CA
Phone: 707-494-5089
email: info@readconsulting.com

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Read Consulting Failure Analysis

Thomas L. Read, PhD,
1435 Fulton Road Santa Rosa, CA
Phone: 707-494-5089
email: info@readconsulting.com

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Thomas L. Read, PhD., CEO
Registered Professional Engineer
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State of California.

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