{
  "dataset": "U.S. Architectural Flat-Glass Thickness Reference",
  "version": "1.0",
  "compiled": "2026-07-25",
  "last_verified": "2026-07-25",
  "publisher": "Fort Wayne Commercial Glass Repair Research",
  "canonical_url": "https://fortwaynecommercialglassrepair.com/research/glass-thickness-chart/",
  "base_source": {
    "organization": "Vitro Architectural Glass",
    "document": "Glass Technical Document TD-120: Flat Glass Trade Thicknesses and Weights",
    "revision": "4",
    "revision_date": "2024-11-28",
    "url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf"
  },
  "calculation_sources": {
    "exact_conversion": {
      "organization": "National Institute of Standards and Technology",
      "rule": "1 inch = exactly 25.4 millimetres",
      "url": "https://www.nist.gov/pml/owm/si-units-length"
    },
    "metric_density": {
      "organization": "National Glass Association",
      "density": "2500 kg/m³",
      "url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers"
    },
    "alternate_us_density": {
      "organization": "National Glass Association",
      "density": "156 lb/ft³",
      "url": "https://www.glass.org/sites/default/files/2023-07/FM05-12_2023_Physical_Mechanical_Properties_Typical_Soda_Lime_Float_Glass.pdf"
    },
    "handling_comparison": {
      "organization": "National Institute for Occupational Safety and Health",
      "constant": "23 kg / 51 lb RNLE load constant under optimal conditions",
      "url": "https://stacks.cdc.gov/view/cdc/110725"
    }
  },
  "formulas": {
    "millimetres": "inches × 25.4",
    "weight_lb_ft2_at_156": "156 × nominal_thickness_in ÷ 12",
    "weight_kg_m2_at_2500": "2500 × nominal_thickness_in × 0.0254",
    "panel_weight": "Vitro-published lb/ft² × panel_area_ft²",
    "area_at_51lb_constant": "51 ÷ Vitro-published lb/ft²"
  },
  "rounding": {
    "converted_mm": "0.001 mm, ROUND_HALF_UP",
    "exact_fraction_mm_and_difference": "0.0001 mm, ROUND_HALF_UP",
    "lb_ft2": "0.001 lb/ft², ROUND_HALF_UP",
    "kg_m2": "0.01 kg/m², ROUND_HALF_UP",
    "panel_weight": "0.1 lb, ROUND_HALF_UP",
    "area": "0.01 ft², ROUND_HALF_UP"
  },
  "notes": [
    "Source weight and thickness fields are transcribed from Vitro TD-120 Revision 4.",
    "Calculated values are reproducible from the disclosed formulas.",
    "Weights are calculated reference values, not measurements of individual lites.",
    "A listed row is not proof of current product availability; Vitro states that some listed thicknesses may not be available.",
    "Panel weights exclude interlayers, coatings, spacers, sealants, framing and hardware.",
    "The NIOSH 51 lb load constant is a baseline in the Revised NIOSH Lifting Equation under optimal conditions, not a universal one-person lifting limit.",
    "The 0.235 in endpoint is printed in both the 6.0 mm and 6.2 mm rows; TD-120 prose assigns 0.235 in to the 6.2 mm class. The source conflict is retained rather than silently resolved.",
    "No ASTM dimensional-tolerance or heat-treatment fabrication-distance fields are included because current proprietary standard tables were not available for direct row-level verification."
  ],
  "column_dictionary": {
    "row_id": "Stable source-order row identifier.",
    "trade_designation": "Traditional designation printed by Vitro, when one is supplied.",
    "common_fraction_label": "Normalized fraction label used for the exact-conversion comparison, when applicable.",
    "mm_class": "Millimetre class printed by Vitro; this is a trade label, not an exact measurement.",
    "vitro_min_in": "Minimum endpoint of the Vitro-published production range, inches.",
    "vitro_max_in": "Maximum endpoint of the Vitro-published production range, inches.",
    "vitro_min_mm": "vitro_min_in multiplied by exactly 25.4 and rounded to 0.001 mm.",
    "vitro_max_mm": "vitro_max_in multiplied by exactly 25.4 and rounded to 0.001 mm.",
    "vitro_nominal_in": "Vitro nominal/reference thickness used for identification and published weight, inches.",
    "vitro_nominal_mm": "vitro_nominal_in multiplied by exactly 25.4 and rounded to 0.001 mm.",
    "vitro_weight_lb_ft2_157": "Vitro-published weight at 157 lb/ft³, pounds per square foot.",
    "weight_lb_ft2_156_nga": "Calculated weight at the NGA 156 lb/ft³ convention, pounds per square foot.",
    "weight_kg_m2_2500": "Calculated weight at the NGA 2,500 kg/m³ convention, kilograms per square metre.",
    "exact_inch_conversion_mm": "Exact mathematical conversion of the traditional fraction label using 25.4 mm/in, when applicable.",
    "mm_class_minus_exact_conversion_mm": "mm_class minus exact_inch_conversion_mm, when applicable.",
    "exact_conversion_inside_vitro_range": "Whether the exact fraction conversion falls inside the Vitro-published range.",
    "exact_conversion_position_vs_vitro_range": "inside, above or below the Vitro-published range, when applicable.",
    "distance_outside_vitro_range_mm": "Distance beyond the closest published range endpoint; zero when inside.",
    "area_ft2_at_niosh_51lb_load_constant": "51 lb divided by Vitro-published lb/ft²; a comparison to the RNLE load constant, not a lifting recommendation.",
    "panel_lb_24x36in": "Glass-only nominal weight for 6 ft² at the Vitro 157 lb/ft³ convention.",
    "panel_lb_36x84in": "Glass-only nominal weight for 21 ft² at the Vitro 157 lb/ft³ convention.",
    "panel_lb_48x96in": "Glass-only nominal weight for 32 ft² at the Vitro 157 lb/ft³ convention.",
    "panel_lb_60x120in": "Glass-only nominal weight for 50 ft² at the Vitro 157 lb/ft³ convention.",
    "base_source_primary": "Primary source used for the Vitro-published source fields.",
    "base_source_url": "Official URL for the Vitro base source.",
    "exact_conversion_source_primary": "Primary source for the exact 25.4 mm-per-inch conversion.",
    "exact_conversion_source_url": "Official URL for the exact-conversion source.",
    "density_156_source_primary": "Primary-source chain for the 156 lb/ft³ and 2,500 kg/m³ density convention.",
    "density_156_source_url": "Official URL documenting the current NGA density convention.",
    "niosh_comparison_source_primary": "Primary source for the 23 kg / 51 lb RNLE load constant used only as a comparison.",
    "niosh_comparison_source_url": "Official URL for the NIOSH lifting-equation manual.",
    "base_source_revision_date": "Revision date of the Vitro base source.",
    "verified": "Date the row and all derived fields were rechecked.",
    "tier": "star = direct primary-source transcription plus reproducible calculation."
  },
  "row_count": 32,
  "column_count": 34,
  "rows": [
    {
      "row_id": "td120-01",
      "trade_designation": "2.0A",
      "common_fraction_label": null,
      "mm_class": "2.0",
      "vitro_min_in": "0.069",
      "vitro_max_in": "0.088",
      "vitro_min_mm": "1.753",
      "vitro_max_mm": "2.235",
      "vitro_nominal_in": "0.081",
      "vitro_nominal_mm": "2.057",
      "vitro_weight_lb_ft2_157": "1.060",
      "weight_lb_ft2_156_nga": "1.053",
      "weight_kg_m2_2500": "5.14",
      "exact_inch_conversion_mm": null,
      "mm_class_minus_exact_conversion_mm": null,
      "exact_conversion_inside_vitro_range": null,
      "exact_conversion_position_vs_vitro_range": null,
      "distance_outside_vitro_range_mm": null,
      "area_ft2_at_niosh_51lb_load_constant": "48.11",
      "panel_lb_24x36in": "6.4",
      "panel_lb_36x84in": "22.3",
      "panel_lb_48x96in": "33.9",
      "panel_lb_60x120in": "53.0",
      "base_source_primary": "Vitro Architectural Glass TD-120, Revision 4",
      "base_source_url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf",
      "exact_conversion_source_primary": "National Institute of Standards and Technology, SI Units – Length",
      "exact_conversion_source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "density_156_source_primary": "National Glass Association FM05-12 (2023) and FB23-25 (2025)",
      "density_156_source_url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers",
      "niosh_comparison_source_primary": "NIOSH Publication No. 94-110, revised September 2021",
      "niosh_comparison_source_url": "https://stacks.cdc.gov/view/cdc/110725",
      "base_source_revision_date": "2024-11-28",
      "verified": "2026-07-25",
      "tier": "star"
    },
    {
      "row_id": "td120-02",
      "trade_designation": "Picture",
      "common_fraction_label": null,
      "mm_class": "2.0",
      "vitro_min_in": "0.071",
      "vitro_max_in": "0.084",
      "vitro_min_mm": "1.803",
      "vitro_max_mm": "2.134",
      "vitro_nominal_in": "0.078",
      "vitro_nominal_mm": "1.981",
      "vitro_weight_lb_ft2_157": "1.021",
      "weight_lb_ft2_156_nga": "1.014",
      "weight_kg_m2_2500": "4.95",
      "exact_inch_conversion_mm": null,
      "mm_class_minus_exact_conversion_mm": null,
      "exact_conversion_inside_vitro_range": null,
      "exact_conversion_position_vs_vitro_range": null,
      "distance_outside_vitro_range_mm": null,
      "area_ft2_at_niosh_51lb_load_constant": "49.95",
      "panel_lb_24x36in": "6.1",
      "panel_lb_36x84in": "21.4",
      "panel_lb_48x96in": "32.7",
      "panel_lb_60x120in": "51.1",
      "base_source_primary": "Vitro Architectural Glass TD-120, Revision 4",
      "base_source_url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf",
      "exact_conversion_source_primary": "National Institute of Standards and Technology, SI Units – Length",
      "exact_conversion_source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "density_156_source_primary": "National Glass Association FM05-12 (2023) and FB23-25 (2025)",
      "density_156_source_url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers",
      "niosh_comparison_source_primary": "NIOSH Publication No. 94-110, revised September 2021",
      "niosh_comparison_source_url": "https://stacks.cdc.gov/view/cdc/110725",
      "base_source_revision_date": "2024-11-28",
      "verified": "2026-07-25",
      "tier": "star"
    },
    {
      "row_id": "td120-03",
      "trade_designation": null,
      "common_fraction_label": null,
      "mm_class": "2.1",
      "vitro_min_in": "0.080",
      "vitro_max_in": "0.088",
      "vitro_min_mm": "2.032",
      "vitro_max_mm": "2.235",
      "vitro_nominal_in": "0.084",
      "vitro_nominal_mm": "2.134",
      "vitro_weight_lb_ft2_157": "1.099",
      "weight_lb_ft2_156_nga": "1.092",
      "weight_kg_m2_2500": "5.33",
      "exact_inch_conversion_mm": null,
      "mm_class_minus_exact_conversion_mm": null,
      "exact_conversion_inside_vitro_range": null,
      "exact_conversion_position_vs_vitro_range": null,
      "distance_outside_vitro_range_mm": null,
      "area_ft2_at_niosh_51lb_load_constant": "46.41",
      "panel_lb_24x36in": "6.6",
      "panel_lb_36x84in": "23.1",
      "panel_lb_48x96in": "35.2",
      "panel_lb_60x120in": "55.0",
      "base_source_primary": "Vitro Architectural Glass TD-120, Revision 4",
      "base_source_url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf",
      "exact_conversion_source_primary": "National Institute of Standards and Technology, SI Units – Length",
      "exact_conversion_source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "density_156_source_primary": "National Glass Association FM05-12 (2023) and FB23-25 (2025)",
      "density_156_source_url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers",
      "niosh_comparison_source_primary": "NIOSH Publication No. 94-110, revised September 2021",
      "niosh_comparison_source_url": "https://stacks.cdc.gov/view/cdc/110725",
      "base_source_revision_date": "2024-11-28",
      "verified": "2026-07-25",
      "tier": "star"
    },
    {
      "row_id": "td120-04",
      "trade_designation": null,
      "common_fraction_label": null,
      "mm_class": "2.3",
      "vitro_min_in": "0.085",
      "vitro_max_in": "0.093",
      "vitro_min_mm": "2.159",
      "vitro_max_mm": "2.362",
      "vitro_nominal_in": "0.089",
      "vitro_nominal_mm": "2.261",
      "vitro_weight_lb_ft2_157": "1.164",
      "weight_lb_ft2_156_nga": "1.157",
      "weight_kg_m2_2500": "5.65",
      "exact_inch_conversion_mm": null,
      "mm_class_minus_exact_conversion_mm": null,
      "exact_conversion_inside_vitro_range": null,
      "exact_conversion_position_vs_vitro_range": null,
      "distance_outside_vitro_range_mm": null,
      "area_ft2_at_niosh_51lb_load_constant": "43.81",
      "panel_lb_24x36in": "7.0",
      "panel_lb_36x84in": "24.4",
      "panel_lb_48x96in": "37.2",
      "panel_lb_60x120in": "58.2",
      "base_source_primary": "Vitro Architectural Glass TD-120, Revision 4",
      "base_source_url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf",
      "exact_conversion_source_primary": "National Institute of Standards and Technology, SI Units – Length",
      "exact_conversion_source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "density_156_source_primary": "National Glass Association FM05-12 (2023) and FB23-25 (2025)",
      "density_156_source_url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers",
      "niosh_comparison_source_primary": "NIOSH Publication No. 94-110, revised September 2021",
      "niosh_comparison_source_url": "https://stacks.cdc.gov/view/cdc/110725",
      "base_source_revision_date": "2024-11-28",
      "verified": "2026-07-25",
      "tier": "star"
    },
    {
      "row_id": "td120-05",
      "trade_designation": null,
      "common_fraction_label": null,
      "mm_class": "2.4",
      "vitro_min_in": "0.091",
      "vitro_max_in": "0.098",
      "vitro_min_mm": "2.311",
      "vitro_max_mm": "2.489",
      "vitro_nominal_in": "0.094",
      "vitro_nominal_mm": "2.388",
      "vitro_weight_lb_ft2_157": "1.230",
      "weight_lb_ft2_156_nga": "1.222",
      "weight_kg_m2_2500": "5.97",
      "exact_inch_conversion_mm": null,
      "mm_class_minus_exact_conversion_mm": null,
      "exact_conversion_inside_vitro_range": null,
      "exact_conversion_position_vs_vitro_range": null,
      "distance_outside_vitro_range_mm": null,
      "area_ft2_at_niosh_51lb_load_constant": "41.46",
      "panel_lb_24x36in": "7.4",
      "panel_lb_36x84in": "25.8",
      "panel_lb_48x96in": "39.4",
      "panel_lb_60x120in": "61.5",
      "base_source_primary": "Vitro Architectural Glass TD-120, Revision 4",
      "base_source_url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf",
      "exact_conversion_source_primary": "National Institute of Standards and Technology, SI Units – Length",
      "exact_conversion_source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "density_156_source_primary": "National Glass Association FM05-12 (2023) and FB23-25 (2025)",
      "density_156_source_url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers",
      "niosh_comparison_source_primary": "NIOSH Publication No. 94-110, revised September 2021",
      "niosh_comparison_source_url": "https://stacks.cdc.gov/view/cdc/110725",
      "base_source_revision_date": "2024-11-28",
      "verified": "2026-07-25",
      "tier": "star"
    },
    {
      "row_id": "td120-06",
      "trade_designation": "Single",
      "common_fraction_label": null,
      "mm_class": "2.5",
      "vitro_min_in": "0.085",
      "vitro_max_in": "0.101",
      "vitro_min_mm": "2.159",
      "vitro_max_mm": "2.565",
      "vitro_nominal_in": "0.089",
      "vitro_nominal_mm": "2.261",
      "vitro_weight_lb_ft2_157": "1.164",
      "weight_lb_ft2_156_nga": "1.157",
      "weight_kg_m2_2500": "5.65",
      "exact_inch_conversion_mm": null,
      "mm_class_minus_exact_conversion_mm": null,
      "exact_conversion_inside_vitro_range": null,
      "exact_conversion_position_vs_vitro_range": null,
      "distance_outside_vitro_range_mm": null,
      "area_ft2_at_niosh_51lb_load_constant": "43.81",
      "panel_lb_24x36in": "7.0",
      "panel_lb_36x84in": "24.4",
      "panel_lb_48x96in": "37.2",
      "panel_lb_60x120in": "58.2",
      "base_source_primary": "Vitro Architectural Glass TD-120, Revision 4",
      "base_source_url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf",
      "exact_conversion_source_primary": "National Institute of Standards and Technology, SI Units – Length",
      "exact_conversion_source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "density_156_source_primary": "National Glass Association FM05-12 (2023) and FB23-25 (2025)",
      "density_156_source_url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers",
      "niosh_comparison_source_primary": "NIOSH Publication No. 94-110, revised September 2021",
      "niosh_comparison_source_url": "https://stacks.cdc.gov/view/cdc/110725",
      "base_source_revision_date": "2024-11-28",
      "verified": "2026-07-25",
      "tier": "star"
    },
    {
      "row_id": "td120-07",
      "trade_designation": "Lami",
      "common_fraction_label": null,
      "mm_class": "2.7",
      "vitro_min_in": "0.102",
      "vitro_max_in": "0.114",
      "vitro_min_mm": "2.591",
      "vitro_max_mm": "2.896",
      "vitro_nominal_in": "0.108",
      "vitro_nominal_mm": "2.743",
      "vitro_weight_lb_ft2_157": "1.413",
      "weight_lb_ft2_156_nga": "1.404",
      "weight_kg_m2_2500": "6.86",
      "exact_inch_conversion_mm": null,
      "mm_class_minus_exact_conversion_mm": null,
      "exact_conversion_inside_vitro_range": null,
      "exact_conversion_position_vs_vitro_range": null,
      "distance_outside_vitro_range_mm": null,
      "area_ft2_at_niosh_51lb_load_constant": "36.09",
      "panel_lb_24x36in": "8.5",
      "panel_lb_36x84in": "29.7",
      "panel_lb_48x96in": "45.2",
      "panel_lb_60x120in": "70.7",
      "base_source_primary": "Vitro Architectural Glass TD-120, Revision 4",
      "base_source_url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf",
      "exact_conversion_source_primary": "National Institute of Standards and Technology, SI Units – Length",
      "exact_conversion_source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "density_156_source_primary": "National Glass Association FM05-12 (2023) and FB23-25 (2025)",
      "density_156_source_url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers",
      "niosh_comparison_source_primary": "NIOSH Publication No. 94-110, revised September 2021",
      "niosh_comparison_source_url": "https://stacks.cdc.gov/view/cdc/110725",
      "base_source_revision_date": "2024-11-28",
      "verified": "2026-07-25",
      "tier": "star"
    },
    {
      "row_id": "td120-08",
      "trade_designation": null,
      "common_fraction_label": null,
      "mm_class": "2.8",
      "vitro_min_in": "0.108",
      "vitro_max_in": "0.114",
      "vitro_min_mm": "2.743",
      "vitro_max_mm": "2.896",
      "vitro_nominal_in": "0.111",
      "vitro_nominal_mm": "2.819",
      "vitro_weight_lb_ft2_157": "1.452",
      "weight_lb_ft2_156_nga": "1.443",
      "weight_kg_m2_2500": "7.05",
      "exact_inch_conversion_mm": null,
      "mm_class_minus_exact_conversion_mm": null,
      "exact_conversion_inside_vitro_range": null,
      "exact_conversion_position_vs_vitro_range": null,
      "distance_outside_vitro_range_mm": null,
      "area_ft2_at_niosh_51lb_load_constant": "35.12",
      "panel_lb_24x36in": "8.7",
      "panel_lb_36x84in": "30.5",
      "panel_lb_48x96in": "46.5",
      "panel_lb_60x120in": "72.6",
      "base_source_primary": "Vitro Architectural Glass TD-120, Revision 4",
      "base_source_url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf",
      "exact_conversion_source_primary": "National Institute of Standards and Technology, SI Units – Length",
      "exact_conversion_source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "density_156_source_primary": "National Glass Association FM05-12 (2023) and FB23-25 (2025)",
      "density_156_source_url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers",
      "niosh_comparison_source_primary": "NIOSH Publication No. 94-110, revised September 2021",
      "niosh_comparison_source_url": "https://stacks.cdc.gov/view/cdc/110725",
      "base_source_revision_date": "2024-11-28",
      "verified": "2026-07-25",
      "tier": "star"
    },
    {
      "row_id": "td120-09",
      "trade_designation": "Double or 1/8 in",
      "common_fraction_label": "1/8 in",
      "mm_class": "3.0",
      "vitro_min_in": "0.115",
      "vitro_max_in": "0.134",
      "vitro_min_mm": "2.921",
      "vitro_max_mm": "3.404",
      "vitro_nominal_in": "0.119",
      "vitro_nominal_mm": "3.023",
      "vitro_weight_lb_ft2_157": "1.557",
      "weight_lb_ft2_156_nga": "1.547",
      "weight_kg_m2_2500": "7.56",
      "exact_inch_conversion_mm": "3.1750",
      "mm_class_minus_exact_conversion_mm": "-0.1750",
      "exact_conversion_inside_vitro_range": true,
      "exact_conversion_position_vs_vitro_range": "inside",
      "distance_outside_vitro_range_mm": "0.0000",
      "area_ft2_at_niosh_51lb_load_constant": "32.76",
      "panel_lb_24x36in": "9.3",
      "panel_lb_36x84in": "32.7",
      "panel_lb_48x96in": "49.8",
      "panel_lb_60x120in": "77.9",
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      "exact_conversion_position_vs_vitro_range": "inside",
      "distance_outside_vitro_range_mm": "0.0000",
      "area_ft2_at_niosh_51lb_load_constant": "3.96",
      "panel_lb_24x36in": "77.2",
      "panel_lb_36x84in": "270.4",
      "panel_lb_48x96in": "412.0",
      "panel_lb_60x120in": "643.7",
      "base_source_primary": "Vitro Architectural Glass TD-120, Revision 4",
      "base_source_url": "https://www.vitroglazings.com/media/02ubg2vz/tech_doc_120.pdf",
      "exact_conversion_source_primary": "National Institute of Standards and Technology, SI Units – Length",
      "exact_conversion_source_url": "https://www.nist.gov/pml/owm/si-units-length",
      "density_156_source_primary": "National Glass Association FM05-12 (2023) and FB23-25 (2025)",
      "density_156_source_url": "https://www.glass.org/news/2026/nga-publishes-updated-glass-technical-papers",
      "niosh_comparison_source_primary": "NIOSH Publication No. 94-110, revised September 2021",
      "niosh_comparison_source_url": "https://stacks.cdc.gov/view/cdc/110725",
      "base_source_revision_date": "2024-11-28",
      "verified": "2026-07-25",
      "tier": "star"
    }
  ]
}