The latest news from American Glass Research.

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Volume 9 / Issue 4
Read our latest white paper published in Glass Worldwide. Download HERE.

2023 in-person international training schedule just announced

We kick off our 2023 in-person training in February in Delft, the Netherlands with our popular Fracture 1 and Design & Lightweighting seminars.

In March, we start in Butler, PA as well as Lake Ammersee/Munich, Germany. 

We will also be in Montecchio, Italy and Krakow, Poland in the first half.

See our full 2023 Training Schedule for all dates and locations..


Breakage of Refillable Beer Bottles

It was reported that 750 ml refillable beer bottles were breaking in the pasteurizer.  The failures consisted of a single crack running radially across the bottom of the bottles as shown in the picture.  In order to properly diagnose the cause of the breakage, it was necessary to determine whether the tensile stresses were too high or whether the glass strengths were too low. 

Based on the nature and simplicity of the fracture pattern, it was concluded that the bottles failed under the influence of a low-level internal pressure which is consistent with failure in a pasteurizer.  The absence of any mirrors at the fracture origins indicated that the failures occurred at very low stress magnitudes.  Thus, the breakage was associated with inadequate glass surface strength. 

Microscopic examination indicated the presence of cleavage scratches randomly distributed across the center bottom region of the containers as shown in this picture and that one of these scratches was present at the fracture origin.  Further measurements revealed that the depths of these scratches ranged from 0.002 inches (0.05 mm) to 0.010 inches (0.25 mm).  These values indicated that the cleavage scratches were relatively severe which was consistent with the low glass surface strengths. 

A scanning electron microscope (SEM) was used to further examine the cleavage scratches at the fracture origin sites to determine if any metal residues were contained within the scratches that would help to identify the source of the scratches. 

No other features were observed within the scratches as shown in in the SEM picture.  Thus, the cleavage scratches most likely had been created by contact with another glass surface. 

It was concluded that the damage had been created by the consumers during collection and recycling of the bottles.  Such damage would have been created during the last recycling; otherwise, due to the severity of the damage and the associated low glass strength, the bottles would have failed during a previous filling. 

In order to avoid this problem in the future, more care must be implemented during handling of the bottles in the recycling processes.

November in-person training still has openings for enrollment
Our in-person training schedule is still available for open enrollment at both our Delft Testing Laboratory and on our Butler, PA Campus.

Fracture 1: Testing and Breakage Diagnosis,
Nov. 7-9 Delft the Netherlands

Evaluation and Lightweighting Glass Container Designs,
Nov. 10-11 Butler, PA

Fracture 2: Advanced Breakage Diagnosis,
Nov. 1-4 Butler, PA 

Audit of Glass Plant Operations, Nov. 10-11 Delft the Netherlands

Coating Technology, Nov. 15-16 Butler, PA

Contact Us if you have any questions.  Private Training at your location is also available.  Look further below for information on all of our on-demand E-seminars.
E-seminar Training Library 

Our on-demand training library is now available.  View all of our on-demand E-seminars including “Sand to Shelf: Essentials of Glass Packaging”  

Private Customized Training

Private customized on-location or webinar training is available. We can conduct any of our existing seminars or create one specificially to meet your unique needs. 

To learn more about all of our in-person seminars, visit our Seminar Catalogue and if you have questions or would like to discuss Private Training Contact Us 
American Glass Research
603 Evans City Road, Butler, PA 16001
Tel: +1 (724) 482-2163
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American Glass Research · 603 Evans City Road · Butler, PA 16001 · USA

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