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PRODUCTS

610 GLASS GENERALLY
• Standards: To BS 952 and BS EN 1863 for heat strengthened soda lime silicate glass.
• Glass quality: Clean and free from obvious scratches, bubbles, cracks, rippling,
dimples and other defects.
• Glass edges: Flat ground, generally undamaged.
- Shells and chips: Permitted to maximum dimensions of 2 mm deep and 5 mm
across surface. Grind out to edges.
- Arrises: Slightly ground, suitable for sealant jointing.

615 DIMENSIONAL TOLERANCES ON GLASS
• Measurement of tolerances: Before thermal toughening and/ or heat
strengthening.
• Panes:
- Dimensions < 1 m: ± 1 mm.
- Dimensions > 1 m: ± 2 mm.
- Squareness: Maximum 4 mm difference in diagonal measurements.
• Holes:
- Positional tolerance: ± 1 mm from single datum point.
- Diameter tolerance: ± 1 mm.

617 DISTORTIONAL TOLERANCES ON GLASS
• Measurement of tolerances: After thermal toughening and/ or heat strengthening:
• Bow (maximum): 0.2% of pane dimension.
• Roller wave for glass thickness (maximum):
- 3–5 mm: 0.5 mm.
- 6–10 mm: 0.3 mm.
- > 12 mm: 0.15 mm.
• Edge dip for glass thickness (maximum):
- 3–5 mm: 0.8 mm.
- 6–10 mm: 0.5 mm.
- > 12 mm: 0.25 mm.

620 THERMALLY TOUGHENED GLASS
• Standard: To BS EN 12150 or BS EN 13024.
• Impact performance: To BS EN 12600.
• Edgework and holes: Complete before toughening.
• Toughening process: Horizontal to eliminate tong marks and minimize dimensional
inaccuracies.
• Nickel sulfide inclusions: Heat soak toughened glass to BS EN 14179.
- Holding period: 2 h.

630 LAMINATED GLASS
• Panes: Thermally toughened glass, combined with heat strengthened glass to BS
EN 1863 and BS EN ISO 12543 or annealed glass to form panes that retain integrity in
event of breakage.
• Interlayers to glass leaves: Polyvinyl butyral (pvb) or cast in place resin. Sealed at
the perimeter to prevent deterioration due to water or glass joint sealant.

RotF generic (intermediate) NBS 2014 6118-AEW-XX-XX-NBS-A-01