Anisotropy Measurement for Architectural Glass

As a manufacturer and supplier of monolithic, laminated and insulated glass panels to the high-end retail and business markets, we produce larger panels that must use heat-treated components, ionoplast interlayers and multi-layer assemblies. This invariably produces optical phenomena that are observable, but deemed inevitable, physical properties inherent to glass manufacturing. We want to offer higher quality products and believe that we can improve those aspects. I explain here our journey to come to introduce a new ASTM standard on how to measure anisotropy. In 2016-17, we partnered with McMaster University to study four optical phenomena: haze, anisotropy, clarity, interference (HACI). Our research results and a literature review were presented at Glass Performance Days (GPD) 2017 in Tampere, Finland. That international conference put us in dialog with several key stakeholders: optical equipment manufacturers, scientists, building owners, façade engineers, etc. During a one-day Tampere workshop on anisotropy, a consensus was reached that the industry needed to start addressing this problem. I am leading a group interested in developing an ASTM Standard Test Method for Measuring Optical Retardations of an Area. This is the first building block that will allow us to tackle this complex optical phenomenon that is not only related to glass processing, but also depending on application and viewing environment. This presentation is a follow-up to 2017 GPD with the latest technical and research updates as well as a status on the ASTM task group activities.

Louis Moreau

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