The latest news from American Glass Research.

View this email in your browser
Volume 9 / Issue 3
Fall In-person training gets underway in Lake Ammersee, Germany
Our in-person training schedule for the remainder of 2022 is now available for open enrollment.  It begins in September in Lake Ammersee, near Munich, Germany, with two of our most popular seminars, however, our first seminar, Fracture 1 Sep. 5-7 is already filled.  
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.
Meet with us at drinktec and glasstec in September

If you are attending the upcoming trade fairs and would like to meet with us to discuss any issues you are having with your glass, please do not hesitate to Contact Us to set up an appointment or stop by our booth. 
 We look forward to seeing you there.

AGR Case Study #3: Discoloration of Returnable Beer Bottles 

A sample of refillable beer bottles was received for an analysis of a visual appearance problem.

These samples had gone through the filling line, including the caustic washer, a number of times and irregular patches of blue discoloration had developed on the glass surface.  A representative example of the visual appearance is shown in the picture.  We were asked to determine the nature and cause of the blue discoloration.  

Selected areas of the blue discoloration were examined under high magnification in a scanning electron microscope (SEM) to further define the nature of the visual problem.  The elemental composition of features associated with the blue discoloration was determined with an energy dispersive X-ray spectrometer (EDX).  
The results of the SEM/EDX analyses are shown in the picture below.  In this figure, the light grey areas were found to be the remnants of the tin oxide hot end coating.  The dark grey areas are those regions of the glass surface where the hot end coating had been removed.  

The physical appearance, shown in picture 1, was typical of glass surfaces that are coated with tin oxide and then subjected to repeated caustic solutions during refilling (see G.L. Smay and J.S. Wasylyk, “Effects of Alkaline Solutions on Tin Oxide Coated Glass Surfaces”, Glass Technology, Vol. 22, No. 6, December 1981, p. 251).  This visual discoloration is due to a chemical attack by the caustic solution at the interface between the tin oxide coating and the underlying glass surface.  The attack loosens the hot end coating which changes the light reflectance properties causing the blue color to appear.  This chemical reaction cannot be avoided and is inherent in refilling bottles that are coated with tin oxide.  With sufficient time, the caustic solutions will totally remove any remnants of the hot end coating and the glass surface will again be visually acceptable.  

Did you know...  AGR now has three options for Proof-of-Design Testing

Predictive testing is key to ensuring optimum bottle performance on the filling line and in the hands of the consumer. Proof-of-design testing is also ideal for qualifying new suppliers, new lines, or new molds. In addition to routine QC pass/fail testing, key tests include dimensions, performance, thickness, annealing, and coating evaluation. 

We now have three different options to ensure comprehensive qualification testing:

1. Filling Line Performance Evaluation: A logical next step after a computer design analysis. Our standard proof-of-design test plan probes all critical aspects of container quality and compares test results to anticipated filling line processing conditions to predict performance.

2. Filling Line Performance Evaluation Plus: Same as above, but tests and measurements are performed on a full set-out (all cavities). The results are then compared to customer specifications and anticipated filling line processing conditions.

3. As-Manufactured Quality Evaluation: Test results and measurements compared to as-manufactured specifications. Any corrective actions that may be required are identified, aiding the glass manufacturer in eliminating defects or meeting internal pass levels.

Contact Us to discuss your needs and the right service for you.
Coming soon... Our 2-session,“Spotlight on: Bottle Breakage 101” live webinar

Through two hours of instruction, we will relate glass properties such as elasticity and strength to the conditions required for glass breakage.  The two sessions will help you determine why a glass container broke. It will introduce the fundamental concepts of fracture analysis

The first 1-hour session will be conducted on Tuesday July 26 and the second session on Thursday July 28 both beginning at 9:00 AM EDT/13:00 GMT/15:00 CEST. Both include live Q&A opportunities.

See our free preview or register HERE.

Visit our E-seminar Library to see all of our recorded E-seminars or Contact Us if you have any questions.
American Glass Research
603 Evans City Road, Butler, PA 16001
Tel: +1 (724) 482-2163
Connect with us:    

Want to change how you receive these emails?
You can update your preferences or unsubscribe from this list

This email was sent to <<Email Address>>
why did I get this?    unsubscribe from this list    update subscription preferences
American Glass Research · 603 Evans City Road · Butler, PA 16001 · USA

Email Marketing Powered by Mailchimp