Both the laminating and tempering divisions of the Glass Association of North America (GANA) were hard at work when they met last week in Toronto for their Fall Conference. Each division discussed the progress and development of various documents and bulletins, as well as other resources.
In the laminating division, work is continuing on the laminated glass deflection table. The task group has been reviewing calculations for deflection testing of tempered glass, which will be used in the Tempering Division’s Engineering Standards Manual. The group is also looking into having similar data pulled for laminated glass mock-ups.
Under new business, the Design Considerations for Laminated Glass Applications document is up for its five-year review and update. A task group is working on this and hopes to ballot any edits in about a month.
The division has also published several new glass informational bulletins (GIB) and documents, including the Sealants and Setting Blocks Test Method, Effects of Moisture GIB and the Marking and Labeling GIB.
Given the increased interest around the subject of glass in railings, members talked about possibly bringing a related speaker to the annual conference in March.
In the Tempering Division, industry consultant Bob Maltby, who has more than 50 years in the glass industry and recently published Bob Maltby’s Glass Book, provided a short presentation on that very subject.
“Glass in the float bath is stronger than steel,” he said, adding that a few feet in [to the bath] it’s no way as strong. He explained when glass comes out of the bath, there are surface attacks by oxygen that affect its surface (cracks). He said everything that’s done to glass in the plant can cause more and more cracks. And he reminded attendees, “Glass is completely strong in compression, but weak in tension. Glass will only break if it gets into tension.”
The group next went into subcommittee and task group reports. Work is continuing on the heavy glass door design guide. The task group is making progress and has been through the entire document once and is now going through it a second time to make sure all action items have been addresses. A task group is also working on the Guidelines for the Production of Heat-Treated Glass GIB. The document is going through its initial ballot.
Work also continues on the Heat-Soaking GIB. Cliff Monroe with Oldcastle BuildingEnvelope®, who chairs the task group, said it’s a very technical document and they are trying to limit it to being just a GIB without being too technical. In other words, it would just explain heat soaking.
A joint task group with the International Window Cleaners Association is also working to update the Proper Procedures for Cleaning Architectural Glass Products GIB.