ISO 10081-2:2003

Overview

ISO 10081-2:2003 provides a standardized system for the classification and designation of dense shaped basic refractory products that contain less than 7% residual carbon after coking. It applies to a wide range of basic refractory types (magnesia-based, doloma, chromite, forsterite, zirconia-containing, etc.), with or without antioxidant additives, and whether or not the products include metal plates or reinforcement. The standard defines how manufacturers and specifiers should identify product type, composition group, raw-material state, bonding system, and any post-treatment.

Key Topics and Requirements

• Scope and exclusion: Covers dense shaped basic refractory products with < 7% residual carbon; products with ≥ 7% residual carbon are excluded (covered in ISO 10081-3).
• Five classification criteria:
  • Type of product (e.g., M = magnesia, ML = magnesia lime, MD = magnesia doloma, MCr = magnesia chromite, Cr = chromite, F = forsterite, MZ/MZS = magnesia-zirconia(-silica)).
  • Group (chemical composition): Primary grouping based on MgO content and, for some types, limits on CaO, Cr2O3, ZrO2 and SiO2. Group ranges are defined in Tables 1 and 2 of the standard.
  • State of raw materials: natural (raw or sintered), synthetic sintered, co-clinker, or fused.
  • Nature of bond: ceramic (sintered), organic chemical, inorganic chemical, or fusion cast.
  • Post-treatment: tempering (up to 800 °C) and/or impregnation (optional).
• Designation format: Product designation lists the five criteria (type, group, raw material state, bond, post-treatment). Antioxidant additives are indicated by appending “A” to the group code.
• Referenced test methods: Chemical analysis carried out in accordance with ISO 10058 or ISO 12677 is used to determine group classification.

Applications and Users

• Who uses it: refractory manufacturers, product engineers, quality and compliance teams, procurement/specification writers, testing laboratories, and end-users in industries requiring high-temperature linings.
• Practical uses:
  • Standardizing product labeling and specification for magnesia-based and other basic refractories.
  • Assisting material selection and procurement decisions for furnaces, kilns, ladles, and other high-temperature installations.
  • Enabling consistent chemical classification for quality control and interchangeability across suppliers.

Related Standards

• ISO 10081 series:
  • Part 1: Alumina‑silica (other part of series)
  • Part 3: Basic products containing 7% to 50% residual carbon
  • Part 4: (under preparation) special products
• Referenced methods: ISO 10058, ISO 12677

Keywords: ISO 10081-2:2003, dense shaped refractory products, basic refractory products, magnesia refractory, classification, residual carbon, refractory designation.