ASTM International has introduced a new standard to assess how sealants interact with laminated glass edges, soon to be published as ASTM C1956. Developed by the flat glass subcommittee (C14.08) of ASTM’s glass and glass products committee (C14), the standard provides a consistent method for evaluating edge effects when sealants directly contact glass interlayers.
Julia Schimmelpenningh, ASTM member and technical engagement manager at Eastman Chemical, notes that incompatibility between certain sealants and interlayers can cause visible edge issues. “This standard tests how well the sealant works with the interlayer, not the interaction between interlayers or the sealant’s weathering performance,” she explains.
The test method is expected to benefit architects, specifiers, manufacturers, and end users by providing clear guidance on material compatibility, helping maintain the visual and aesthetic performance of laminated glass in construction projects.
By standardizing evaluation practices, ASTM continues to drive innovation, improve quality, and build confidence in building materials worldwide. The initiative also supports the United Nations Sustainable Development Goal #9 on industry, innovation, and infrastructure. 
Source: ASTM with additional information added by Glass Balkan
