GANA Gets Rolling with Laminated Glass Discussions

The GANA fall conference began Tuesday in conjunction with GlassBuild.

As the annual GlassBuild exhibition got started on the Georgia World Congress Center show floor, the Glass Association of North America (GANA) gathered for its Fall Conference just down the hall.

GANA’s laminating division kicked off the series of meetings, which will run through Thursday. The group discussed ongoing activities, including the study of compression testing for interlayers and the potential development of a Glass Information Bulletin (GIB) on laminated glass doors.

Additionally, a tornado glazing GIB is still being finalized, and the laminating division is looking for additional members to complete a revision of a dynamic glazing GIB. Laminating division chair Aaron Thompson said GANA typically reviews GIBs and other published documents at least every five years.

GANA technical director Urmilla Sowell touched on the sealant compatibility standard test method that was developed by GANA a few years ago. She said that since the industry is now using it, the next step is to move it to ASTM International. Julia Schimmelpenningh is leading a task group that aims to get the standard in front of ASTM for review to eventually be published as an ASTM standard.

John Kent gave conference attendees an update on the Safety Glazing Certification Council and Insulating Glass Certification Council activities. He pointed out that the big news this year is that with Canada updating its safety glazing standard for the first time since 1990, ANSI, CPSC and CAN/CGSB are now all essentially using one standard. “This is pretty significant, since it’s the first time this has happened in 40 years,” he said.

Schimmelpenningh later led a discussion about what the future could hold for the inclusion of jumbo glass in standards—particularly ASTM C1172 (the specification for laminated glass)—and whether GANA should further explore this. Members went back and forth on the topic, proposing that they should first come up with a better standard definition for what exactly “jumbo,” “oversized” or “large” glass really means.

Ultimately, attendees took a straw poll and voted to assemble an informal group to explore possibly developing an “outline” document or GIB to better define jumbo glass, which could be used to guide future discussions on standards.

Later in the morning, protective glazing council (PGC) acting chair Carrie Davis, serving in that role in place of Liz Grimes, provided an update on that group’s activities.

The PGC continues to work on a proposal for a government affairs training workshop that would be held in Washington, D.C. She said the one-day workshop would cover current industry practices, emerging trends and more. Comments regarding the proposed workshop will be reviewed at an upcoming board meeting.

Jon Kimberlain concluded the day’s meetings with a presentation on blast performance of point-fixed assemblies using transparent structural silicone adhesive (TSSA).

He presented a recent study that included mock-up testing using a shock tube with an explosive charge to simulate blast loads onto adhesively bonding transparent assemblies. He discussed details of the testing, which was done using 5-by-5-foot laminated glass window assemblies, and showed video demonstrations.

Kimberlain said the tested assembly, using the TSSA technology, was able to withstand multiple 6-PSI blast overpressures. It failed multiple blasts at 10 PSI but did pass one at that level. Based on the ASTM F2912 “glazing systems subject to airblast loadings” standard, the assembly met “a hazard level of H1 at a specification level of C1,” he said. He hopes to do further testing at higher levels, possibly using thicker glass to validate TSSA’s actual strength, as the tests suggest glass breakage has shown to be the weak link in performance of the system.

Stay tuned to USGNN.com™ for continued coverage of GANA’s fall conference.

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