Overview
ISO 16293-3:2017 - "Glass in building - Basic soda lime silicate glass products - Part 3: Polished wired glass" specifies dimensional and minimum quality requirements for polished wired glass used in building applications. The standard applies only to rectangular panes (stock sizes and final cut sizes) and covers tolerances, wire-mesh characteristics, inspection methods and acceptance criteria for optical faults, visual faults and wire faults.
Key topics and technical requirements
- Scope and product type
- Applies to polished wired soda‑lime silicate glass supplied in rectangular panes.
- Dimensional requirements
- Thickness measured as the average of four readings (one at each side) to 0.01 mm; rounded limits given for nominal 7 mm and 10 mm thicknesses.
- Tolerances on length and width: ±4 mm.
- Squareness controlled by limits on diagonal differences (vary by pane size).
- Wire mesh
- Wire diameter: ≥ 0.42 mm.
- Mesh dimensions: maximum 16 mm for square pattern, 32 mm for diamond pattern.
- Parallel strand spacing: 45–55 mm; all intersections must be welded.
- Quality requirements and inspection
- Two inspection regimes: optical faults (distortions seen through the glass) and visual faults (spot, elongated/linear or wire-related faults).
- Optical inspection setup: pane placed 1 m from strip lights, observer 1 m away.
- Visual inspection setup: pane viewed at 2 m in front of a matt black screen under diffuse daylight conditions.
- Acceptance: no disturbing optical distortions allowed. Detailed numeric acceptance limits are provided for spot and elongated faults depending on size and distance from the wire.
- Wire faults
- Limits for deviations (out of square/out of parallel, waviness, bow): typically 16 mm per metre or specified ratios for diamond mesh.
- No penetrations of the glass surface by wire and no wire breaks are acceptable.
- Edge defects (final cut sizes)
- Limits on entrant/emergent faults and bevels expressed relative to glass thickness (e.g., bevel ratio d/e
Open preview (PDF)Glass in building — Basic soda lime silicate glass products — Part 3: Polished wired glass
