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GGF Guidelines

Glass Scratches & Visual Imperfections

The Glass and Glazing Federation (GGF) sets out industry standards for acceptable visual quality in flat transparent glass (including float, laminated, toughened, and coated glass). Below is a summary of the inspection criteria and acceptable tolerances:

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Inspection Conditions

  • Glass should be inspected in natural daylight, not direct sunlight.
  • Glass must be clean and dry.
  • View from a minimum distance of 3 meters for toughened/laminated/coated glass.
  • Inspect from three angles: straight on, and 45° from both the left and right.
  • A 50mm wide band around the edge is excluded from inspection.
glass doors, glass partitions, glass office, fire rated glass, fire rated doors, fire rated partitions, framed glass doors, frameless glass doors, sliding glass doors, internal glass doors, bespoke glass doors, internal glass partitions, bespoke glass partitions

Acceptable Imperfections

  • Fine scratches up to 25mm long (provided they are not grouped or visually obtrusive).
  • Minute embedded particles.
  • Small air bubbles or blisters.
glass doors, glass partitions, glass office, fire rated glass, fire rated doors, fire rated partitions, framed glass doors, frameless glass doors, sliding glass doors, internal glass doors, bespoke glass doors, internal glass partitions, bespoke glass partitions

Unacceptable Defects

  • Bunched or noticeable imperfections that distract visually.
  • Smears, fingerprints, or dirt on either glass face.
  • Contaminants or marks inside sealed units.
glass doors, glass partitions, glass office, fire rated glass, fire rated doors, fire rated partitions, framed glass doors, frameless glass doors, sliding glass doors, internal glass doors, bespoke glass doors, internal glass partitions, bespoke glass partitions

Special Considerations

  • Toughened Glass: May show natural phenomena like haze, bowing, or anisotropy. These are not considered defects.
  • Laminated Glass: Due to its layered structure, more imperfections may be visible. A 25% greater tolerance is allowed compared to standard float glass.
glass doors, glass partitions, glass office, fire rated glass, fire rated doors, fire rated partitions, framed glass doors, frameless glass doors, sliding glass doors, internal glass doors, bespoke glass doors, internal glass partitions, bespoke glass partitions

Inspection Conditions

  • Glass should be inspected in natural daylight, not direct sunlight.
  • Glass must be clean and dry.
  • View from a minimum distance of 3 meters for toughened/laminated/coated glass.
  • Inspect from three angles: straight on, and 45° from both the left and right.
  • A 50mm wide band around the edge is excluded from inspection.

Acceptable Imperfections

  • Fine scratches up to 25mm long (provided they are not grouped or visually obtrusive).
  • Minute embedded particles.
  • Small air bubbles or blisters.
glass doors, glass partitions, glass office, fire rated glass, fire rated doors, fire rated partitions, framed glass doors, frameless glass doors, sliding glass doors, internal glass doors, bespoke glass doors, internal glass partitions, bespoke glass partitions
glass doors, glass partitions, glass office, fire rated glass, fire rated doors, fire rated partitions, framed glass doors, frameless glass doors, sliding glass doors, internal glass doors, bespoke glass doors, internal glass partitions, bespoke glass partitions

Unacceptable Defects

  • Bunched or noticeable imperfections that distract visually.
  • Smears, fingerprints, or dirt on either glass face.
  • Contaminants or marks inside sealed units.

Special Considerations

  • Toughened Glass: May show natural phenomena like haze, bowing, or anisotropy. These are not considered defects.
  • Laminated Glass: Due to its layered structure, more imperfections may be visible. A 25% greater tolerance is allowed compared to standard float glass.
glass doors, glass partitions, glass office, fire rated glass, fire rated doors, fire rated partitions, framed glass doors, frameless glass doors, sliding glass doors, internal glass doors, bespoke glass doors, internal glass partitions, bespoke glass partitions