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Did you know?
Glass will not break under a compressive load. Only a tensile stress will cause glass to fracture.



Glass Quality

The process of manufacturing glass containers is complex and a number of challenges must be overcome to produce a high-quality final article.  From raw materials, to melting and refining processes, to the final forming and finishing operations, each step in the process provides its own unique opportunities for glass quality issues to arise.

Many of the problems that effect the performance of an article are either batch related or the direct result of problems in the melting process. These issues are generally categorized as "glass quality" problems, and some prime examples of glass quality issues are:
 
  • "STONES" AND OTHER INCLUSIONS: inclusions are small quantities of unwanted material that are embedded or buried in the glass itself.  The most recognizable form is called a "stone," and generally consists of solid material encased in the glass while it was still molten.  However, inclusions also consist of materials embedded in the glass surface during forming, or gas bubbles in the glass (also called seeds or blisters).  All of these defects can negatively affect the performance of a glass article, and our expertise allows for the evaluation of these defects for severity, composition, and root causes;
 
  • CORD (also known as ream, striae, or "cat scratch"): is a streak of glass with a composition different from the bulk.  These defects can compromise the strength and appearance of a container. We can perform quantitative measurements of cord stress, as well as identify the cord composition;
  • COLOR & TRANSMISSION: problems can arise if the glass does not have the desired color or ultraviolet (UV) transmission properties.  These parameters are dependent upon the glass composition. American Glass Research has the ability to evaluate these properties and make recommendations for improvement;
  • GLASS CHEMISTRY: improper glass chemistry can lead to problems with severe weathering, corrosion, or unwanted interactions with the product.  We are equipped to perform evaluations of glass composition and density.  We can also perform direct evaluations of chemical durability from water or acid attack, with or without the presence of internal treatments.  For pharmaceutical customers we are equipped to determine compliance with USP and EP guidelines for parenteral use of glass containers.  
If you are experiencing glass quality problems and need answers fast, please do not to hesitate to give us a call.  There is no upfront charge to speak to one of our experts, and we would be more than happy to discuss how our services can benefit you.  If testing is pursued, a formal report, written in plain language, will be prepared with a summary of our procedures, results, conclusions, and recommendations for eliminating the problem.  Pricing is based on time, materials, and equipment usage, and a cost-free, upfront quote for service is available upon request.  If necessary, American Glass Research personnel are available for on-site inspection and consulting as well.
 

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