Overview
ISO 22509:2020 - "Glass in building - Heat strengthened soda lime silicate glass" defines product definitions and the key physical, mechanical and fracture characteristics for flat heat strengthened soda lime silicate glass used in buildings. Published in 2020, the standard covers tolerances, flatness, edgework, fragmentation behaviour and test methods for flat panes. It excludes curved (bent) glass and surface-finished glasses (e.g., sandblasted, acid etched) after heat strengthening. Where heat strengthened glass is incorporated into assemblies (laminated or insulating units) or receives additional treatments (coatings), additional product standards apply.
Key Topics and Requirements
- Product scope and definitions: Terms such as heat strengthened glass, air cushion process, edge lift, roller wave and overall bow are defined to ensure consistent use.
- Dimensions and tolerances: Nominal thickness, thickness tolerances, width/length limits, squareness and edge deformation produced by vertical or horizontal processes are specified conceptually (measurement methods and acceptance limits are defined in the standard itself).
- Flatness and distortion measurement: Methods and limits for overall bow, roller wave, wave/perimeter deformation (air cushion process), edge lift and local distortion (vertical process) are included.
- Edgework, holes, notches and cut-outs: Guidance on allowable edge finishing, round holes (diameter, position, tolerances) and shaped panes prior to heat strengthening.
- Fracture and fragmentation: Test procedures, specimen sizes, assessment and evaluation criteria for fragmentation behaviour after breakage are specified to assess safety characteristics.
- Other physical characteristics: Optical distortion, anisotropy (iridescence), thermal durability, mechanical strength, surface pre-stress, marking and packaging requirements are covered.
- Test and reporting requirements: Fragmentation test methods and test report contents are defined to support conformity assessment.
Practical Applications and Who Uses It
ISO 22509 is intended for professionals and organizations involved in the specification, manufacture, testing and use of heat strengthened architectural glass:
- Glass manufacturers and tempering plants - to control production, flatness and edgework.
- Product engineers and QA/QC teams - for testing fragmentation, mechanical strength and thermal durability.
- Façade engineers, architects and specifiers - to select appropriate glass types for façades, balustrades and other structural glazing where improved thermal and mechanical performance is required.
- Test laboratories and certification bodies - to perform standardized fragmentation and distortion testing.
- Glazing contractors and systems integrators - to ensure compatibility of heat strengthened glass with laminated or insulating glass assemblies (following additional applicable standards).
Related Standards
- ISO 16293-1, -2, -5 (basic soda lime silicate glass products; float and patterned glass)
- ISO 11479-1 (coated glass physical defects)
- ISO 1288-3 (bending strength test methods)
Keywords: ISO 22509, heat strengthened glass, soda lime silicate glass, glass in building, fragmentation, flatness, edgework, air cushion process, thermal durability, mechanical strength.