Glass defects and contamination analysis

Our technical experts analyse glass composition and causes of defective glass to quickly resolve your production issues. We undertake composition analysis of glass inclusion defects, stone, cord, knot, bubbles and blisters, and we examine surface contamination, delamination, misting and blooms. We also assess forming defects in glass manufacturing and quality concerns in finished products.

Glass inclusion defects, stone, cord and knot

Stone and cord in glass can lead to significant losses in production. We work closely with you to determine the root cause of the problem and recommend remedial action. We work quickly, and we also offer an express service to provide results shortly after receipt of the sample.

We use an extensive range of analytical facilities, including optical microscopy and scanning electron microscopy with microanalysis, plus wet chemical analysis and other analytical techniques.

Contamination analysis

We undertake composition analysis to highlight the source of foreign materials and determine remedial action. This test is typically carried out by x-ray fluorescent spectrometry. However, for exotic or specialist glasses, or other specific requirements, we can use trace element analysis or various additional methods – such as atomic absorption spectroscopy, inductively coupled plasma, optical emission spectrometry and wet chemistry.

Bubble and blister analysis

Bubble/blister in glass can lead to significant losses in production. Using our portable quadropole mass spectrometer, we identify the component gases, enabling us to determine the possible sources and eliminate the problem.

Our rapid analysis can identify water, nitrogen, oxygen, argon, carbon dioxide, sulphur dioxide, carbon oxy-sulphide and hydrogen sulphide. Analysis for other gases can be performed on request. We offer a same or next day service and provide opinions and recommendations in addition to the results.

Coatings, surfaces and delamination

The surface of glass can be a source of unique and wide-ranging problems, and the properties of glass surfaces can be very different to the bulk (glass) properties. We have extensive experience in analysing and understanding surface-related issues including

• bloom and weathering
• decorative coatings
• adhesion
• surface contamination
• delamination
• hot-end coating durability
• cap/glass interactions
• durability

Forming defects

We perform visual assessments, sometimes combined with chemical analysis, to identify and assess forming issues for a range of glass products, including glass bottle defects, and advise on remedial action.