AGNORA Achieves ISO Heat Soak Standard Accreditation

AGNORA recently has been accredited for the new Heat Soak Testing (HST) Standard ISO 20657, which aims to mitigate glass breakage caused by nickel sulfide (NiS) inclusions. The new standard is an evolution of the EN14179-1:2005 standard, which proved a slightly lower HST temperature is effective for testing. The EN14179 is now under revision.

“The aim of the new standard is to catch more particles and thus increase the reliability of this destructive testing,” says Louis Moreau, head of technology and innovation at AGNORA.

NiS inclusions are small particles that are formed in the glass manufacturing process from the sulfur of the firing agent and surrounding metallic surfaces. These inclusions then contract through the tempering process, resulting in an unstable, smaller structure. Over time, the NiS inclusions will expand back to their original state, exerting immense forces on the glass and eventually causing breakage.

The HST process allows NiS inclusions that may be in the tempered glass to expand back to their original size in the safety of a chamber. Since there are variations of NiS structures, the new ISO standard aims to make all variations react.

“Since there are different ‘types’ of NiS inclusions the test must encourage all of them to react and create that failure. This is what the new ISO accreditation ensures: The broadest range of reactions to produce failure, should there be any,” says Moreau. “We follow the leading ISO requirements because it is the best evidence-based approach we can facilitate. In addition, we will be able to provide our customers with a report on each batch of glass tested indicating temperature curve and time spent in the oven.”

Tristar Installs New Tempering Equipment

Tristar Glass Inc. has added its seventh furnace to its equipment portfolio. With the new machine, the company’s goal is to increase heat-treating quality, throughput capacity and operational safety.

This furnace, installed in Tristar’s Catoosa, Okla., facility, is the company’s fourth and largest of Glaston’s FC Chinook series furnaces. According to the company, the furnace features the largest North American bed size, 130 by 310 inches, and is the first system to feature both Glaston’s FC and VortexPro convection systems.

The furnace will be fed via a German-engineered Benteler automated-seaming-batching-washing system and quality will be monitored using LiteSentry’s Osprey 8 Complete anisotropy + distortion inspection system.

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