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Annealing Assessment

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GTS annealing assessment assesses the quality of the annealing process for glass containers, domestic glassware and other glass products, in order to ensure the quality of the end product.Our annealing assessment assesses the quality of the annealing process for glass containers, domestic glassware and other glass products, in order to ensure the quality of the end product.

Annealing assessments are carried out o determine the levels of residual stress present within the glass after annealing has been carried out. A general inspection is carried out using polarised light and the residual stress is calculated in accordance with American standard ASTM C148. In addition to the areas specified in ASTM C148, any areas of high residual stress such as at the rim or foot of stemware is also recorded and reported.

Residual stress assessment can also be carried out to ASTM F2179-02, which applies to candle glasses. 

Toughening Assessment

Visual examination of stress pattern using polarised light along with scratch and fragmentation testing to determine the effectiveness of the heat strengthening process.

Technical Consultancy

Our technical experts provide support throughout the glass supply chain - providing clients with market advantage, knowledge and technical input to improve their manufacture, proce…


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Quality Assessment - Retail

Quality Assessment - Retail

A high street name requested routine quality assessment of a new product line, as a case of due diligence. How did GTS help? During the quality assessment,...

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