A glass expert in California compares Pyrex glass ware from two eras. The original glass ovenware was developed by Corning Glass Works. They introduced annealed borosilicate glass that had a lower thermal expansion coefficient than the more common soda lime glass. The lower expansion coefficient reduced the level of thermal shock and allowed this glass […]
Safety Expert Examines a Personal Injury from Bungee Cord
Safety Expert analyzes the cause of injury to a wakeboard user from a bungee cord on the wakeboard rack. The rack is a piece of sports equipment, and it is designed to hold two boards in place with two 19″ long bungee cords; each has a 1″ plastic ball on […]
Beer Bottle Impact Failure Analysis
Glass failure expert analyzed a failed beer bottle to determine if there was a product defect. It was stated that the bottle exploded when it was put into a cooler filled with ice. The failure analysis revealed that the bottle had been hit with a sharp object. The photograph on the left is the bottle […]
Tempered Safety Glass
California glass failure expert discusses the safety aspects of tempered glass; Tempered glass is safer than standard (i.e. annealed) glass because “dices” into small pieces under certain failure modes. In reality, the overall glass failure is driven by residual stresses put into the glass by the tempering process. That is, tempered glass “destroys” itself. If […]
Bottle Sealing Requirements
Glass expert discusses a manufacturing defect that can prevent the sealing of a bottle. The client was using a Polyseal 01 with a cap to seal 750 ml bottles of a solvent. These bottles were packaged 4 to a case and sent to customers. During shipping a fixed percentage of the bottles would leak. A […]
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