{
  "name": "GY Alumina standard sizes: alumina protection tubes, multi-bore insulators and furnace tubes",
  "description": "The 63 standard sizes on our factory's September 2026 size lists, in millimetres: 18 thermocouple protection tubes, 33 single-, twin- and four-bore insulators and 12 furnace tubes, with wall thickness computed as (OD − ID) ÷ 2, whether the size is usually in stock or made to order, the European closed-end series with the same OD × ID (a dimension match only) and the size's page. Lengths are cut to order.",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "credit": "Source: GY Alumina (gyalumina.com), CC BY 4.0",
  "creator": "GY Alumina",
  "url": "https://gyalumina.com/resources#data-standard-sizes",
  "guide": "https://gyalumina.com/guides/thermocouple-protection-tube-sizes",
  "dateModified": "2026-09-29",
  "columns": [
    {
      "key": "product",
      "description": "Product type"
    },
    {
      "key": "size_mm",
      "description": "Nominal size as OD × ID (tubes) or OD × bore (insulators), mm"
    },
    {
      "key": "od_mm",
      "description": "Outside diameter, mm"
    },
    {
      "key": "id_mm",
      "description": "Inside diameter, mm (tubes)"
    },
    {
      "key": "bores",
      "description": "Number of bores (insulators)"
    },
    {
      "key": "bore_mm",
      "description": "Diameter of each bore, mm (insulators)"
    },
    {
      "key": "wall_mm",
      "description": "Wall thickness, computed as (OD − ID) ÷ 2, mm (tubes and single-bore insulators)"
    },
    {
      "key": "availability",
      "description": "\"Usually in stock\" (September 2026 stock list) or \"Made to order\""
    },
    {
      "key": "european_series",
      "description": "European closed-end series with the same OD × ID, per Morgan's 2026 price list; dimensions only"
    },
    {
      "key": "page",
      "description": "The size's page on gyalumina.com"
    }
  ],
  "rows": [
    {
      "product": "Thermocouple protection tube",
      "size_mm": "6×4",
      "od_mm": "6",
      "id_mm": "4",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "1",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-6x4-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "7×5",
      "od_mm": "7",
      "id_mm": "5",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "1",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-7x5-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "8×5",
      "od_mm": "8",
      "id_mm": "5",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "1.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-8x5-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "9×6",
      "od_mm": "9",
      "id_mm": "6",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "1.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-9x6-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "10×6",
      "od_mm": "10",
      "id_mm": "6",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2",
      "availability": "Usually in stock",
      "european_series": "C 799",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-10x6-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "10×7",
      "od_mm": "10",
      "id_mm": "7",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "1.5",
      "availability": "Usually in stock",
      "european_series": "C 610",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-10x7-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "12×8",
      "od_mm": "12",
      "id_mm": "8",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-12x8-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "13×8",
      "od_mm": "13",
      "id_mm": "8",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-13x8-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "14×10",
      "od_mm": "14",
      "id_mm": "10",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-14x10-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "15×10",
      "od_mm": "15",
      "id_mm": "10",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2.5",
      "availability": "Usually in stock",
      "european_series": "C 799",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-15x10-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "15×11",
      "od_mm": "15",
      "id_mm": "11",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2",
      "availability": "Usually in stock",
      "european_series": "C 610",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-15x11-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "16×12",
      "od_mm": "16",
      "id_mm": "12",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-16x12-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "17×12",
      "od_mm": "17",
      "id_mm": "12",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-17x12-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "18×13",
      "od_mm": "18",
      "id_mm": "13",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-18x13-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "20×15",
      "od_mm": "20",
      "id_mm": "15",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "2.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-20x15-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "24×18",
      "od_mm": "24",
      "id_mm": "18",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "3",
      "availability": "Usually in stock",
      "european_series": "C 799",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-24x18-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "25×18",
      "od_mm": "25",
      "id_mm": "18",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "3.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-25x18-mm"
    },
    {
      "product": "Thermocouple protection tube",
      "size_mm": "26×20",
      "od_mm": "26",
      "id_mm": "20",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "3",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-protection-tubes/protection-tube-26x20-mm"
    },
    {
      "product": "Single-bore insulator",
      "size_mm": "2×1",
      "od_mm": "2",
      "id_mm": "",
      "bores": "1",
      "bore_mm": "1",
      "wall_mm": "0.5",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/single-bore-insulator-2x1-mm"
    },
    {
      "product": "Single-bore insulator",
      "size_mm": "2.5×1.5",
      "od_mm": "2.5",
      "id_mm": "",
      "bores": "1",
      "bore_mm": "1.5",
      "wall_mm": "0.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/single-bore-insulator-2-5x1-5-mm"
    },
    {
      "product": "Single-bore insulator",
      "size_mm": "3×2",
      "od_mm": "3",
      "id_mm": "",
      "bores": "1",
      "bore_mm": "2",
      "wall_mm": "0.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/single-bore-insulator-3x2-mm"
    },
    {
      "product": "Single-bore insulator",
      "size_mm": "4×2.5",
      "od_mm": "4",
      "id_mm": "",
      "bores": "1",
      "bore_mm": "2.5",
      "wall_mm": "0.75",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/single-bore-insulator-4x2-5-mm"
    },
    {
      "product": "Single-bore insulator",
      "size_mm": "5×3",
      "od_mm": "5",
      "id_mm": "",
      "bores": "1",
      "bore_mm": "3",
      "wall_mm": "1",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/single-bore-insulator-5x3-mm"
    },
    {
      "product": "Single-bore insulator",
      "size_mm": "6×4",
      "od_mm": "6",
      "id_mm": "",
      "bores": "1",
      "bore_mm": "4",
      "wall_mm": "1",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/single-bore-insulator-6x4-mm"
    },
    {
      "product": "Single-bore insulator",
      "size_mm": "8×5",
      "od_mm": "8",
      "id_mm": "",
      "bores": "1",
      "bore_mm": "5",
      "wall_mm": "1.5",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/single-bore-insulator-8x5-mm"
    },
    {
      "product": "Single-bore insulator",
      "size_mm": "10×4",
      "od_mm": "10",
      "id_mm": "",
      "bores": "1",
      "bore_mm": "4",
      "wall_mm": "3",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/single-bore-insulator-10x4-mm"
    },
    {
      "product": "Single-bore insulator",
      "size_mm": "12×7",
      "od_mm": "12",
      "id_mm": "",
      "bores": "1",
      "bore_mm": "7",
      "wall_mm": "2.5",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/single-bore-insulator-12x7-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "2×0.5",
      "od_mm": "2",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "0.5",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-2x0-5-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "2.5×0.7",
      "od_mm": "2.5",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "0.7",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-2-5x0-7-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "3×0.8",
      "od_mm": "3",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "0.8",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-3x0-8-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "3.5×0.9",
      "od_mm": "3.5",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "0.9",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-3-5x0-9-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "4×1",
      "od_mm": "4",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "1",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-4x1-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "4.2×1.1",
      "od_mm": "4.2",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "1.1",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-4-2x1-1-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "4.5×1.2",
      "od_mm": "4.5",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "1.2",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-4-5x1-2-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "5×1.2",
      "od_mm": "5",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "1.2",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-5x1-2-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "5.5×1.4",
      "od_mm": "5.5",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "1.4",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-5-5x1-4-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "6×1.4",
      "od_mm": "6",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "1.4",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-6x1-4-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "8×1.8",
      "od_mm": "8",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "1.8",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-8x1-8-mm"
    },
    {
      "product": "Twin-bore insulator",
      "size_mm": "8.5×1.8",
      "od_mm": "8.5",
      "id_mm": "",
      "bores": "2",
      "bore_mm": "1.8",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/twin-bore-insulator-8-5x1-8-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "2×0.4",
      "od_mm": "2",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "0.4",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-2x0-4-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "2.5×0.6",
      "od_mm": "2.5",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "0.6",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-2-5x0-6-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "3×0.6",
      "od_mm": "3",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "0.6",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-3x0-6-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "3.5×0.8",
      "od_mm": "3.5",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "0.8",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-3-5x0-8-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "4×1",
      "od_mm": "4",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "1",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-4x1-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "4.2×1.0",
      "od_mm": "4.2",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "1.0",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-4-2x1-0-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "4.5×1.1",
      "od_mm": "4.5",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "1.1",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-4-5x1-1-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "5×1.2",
      "od_mm": "5",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "1.2",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-5x1-2-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "5.5×1.3",
      "od_mm": "5.5",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "1.3",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-5-5x1-3-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "6×1.3",
      "od_mm": "6",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "1.3",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-6x1-3-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "8×1.6",
      "od_mm": "8",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "1.6",
      "wall_mm": "",
      "availability": "Made to order",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-8x1-6-mm"
    },
    {
      "product": "Four-bore insulator",
      "size_mm": "8.5×1.6",
      "od_mm": "8.5",
      "id_mm": "",
      "bores": "4",
      "bore_mm": "1.6",
      "wall_mm": "",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/thermocouple-insulators/four-bore-insulator-8-5x1-6-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "30×20",
      "od_mm": "30",
      "id_mm": "20",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-30x20-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "30×23",
      "od_mm": "30",
      "id_mm": "23",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "3.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-30x23-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "32×25",
      "od_mm": "32",
      "id_mm": "25",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "3.5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-32x25-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "35×25",
      "od_mm": "35",
      "id_mm": "25",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-35x25-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "40×30",
      "od_mm": "40",
      "id_mm": "30",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-40x30-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "45×35",
      "od_mm": "45",
      "id_mm": "35",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-45x35-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "50×40",
      "od_mm": "50",
      "id_mm": "40",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-50x40-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "55×45",
      "od_mm": "55",
      "id_mm": "45",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-55x45-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "60×50",
      "od_mm": "60",
      "id_mm": "50",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-60x50-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "65×55",
      "od_mm": "65",
      "id_mm": "55",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-65x55-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "70×60",
      "od_mm": "70",
      "id_mm": "60",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-70x60-mm"
    },
    {
      "product": "Furnace tube",
      "size_mm": "80×70",
      "od_mm": "80",
      "id_mm": "70",
      "bores": "",
      "bore_mm": "",
      "wall_mm": "5",
      "availability": "Usually in stock",
      "european_series": "",
      "page": "https://gyalumina.com/products/furnace-tubes/furnace-tube-80x70-mm"
    }
  ]
}