Overview
ISO 29771:2008 - "Thermal insulating materials for building applications - Determination of organic content" - specifies the equipment, conditioning and test procedures for measuring the organic content of mainly inorganic thermal insulating materials. The method determines organic content by mass loss on heating: specimens are dried, weighed, heated to burn off organics (typically in a furnace at 500 ± 20 °C), cooled in a desiccator and re‑weighed until constant mass is reached. Results are expressed as a percent mass fraction (organic content).
Key topics and technical requirements
- Scope and limits
- Intended for products that are essentially inorganic (low organic fraction), either unfaced or the insulating core of faced products.
- Not applicable where water of hydration or combined carbonates/sulfates are present, and not for adhesives, facings or coatings.
- Principle
- Organic content determined as mass loss after controlled drying and high‑temperature ignition (loss on ignition).
- Apparatus
- Analytical balance (capable to 0.001 g), ventilated oven (105 ± 5 °C or as specified), ventilated furnace (500 ± 20 °C or as specified), inert preheated crucibles/trays, desiccator.
- Specimen preparation
- Minimum specimen mass 10–200 g; thickness equal to original product thickness; at least eight pieces sampled across product surface (typical test uses ≥5 specimens unless product standard specifies otherwise).
- Remove facings/coatings before sampling; condition specimens by drying to constant mass.
- Procedure & calculation
- Weigh container, weigh container + dried specimen, heat in furnace until organics are burned off, cool and re‑weigh; repeat heating/cooling until mass is constant. Organic content is calculated from the mass loss relative to specimen mass (expressed as %).
- Annex A
- Provides a simplified method suitable for factory production control (continuous weighing arrangement, no pre‑conditioning if specimens are taken directly from the production line).
- Notes
- This edition does not include a formal statement on measurement accuracy.
- Can be used to help verify compliance with EN 13501‑1 for Euroclass A1 classification based on organic content thresholds.
Applications and users
- Who uses it
- Test laboratories, insulation manufacturers, quality control teams, certification bodies, building product R&D and regulatory compliance officers.
- Practical uses
- Routine factory production control and batch testing (using simplified method).
- Product conformity testing for fire classification and regulatory documentation.
- Material characterization during product development and failure analysis.
Related standards
- ISO 29771 is part of a family of ISO standards for thermal insulating products (e.g., ISO 29465, ISO 29466, ISO 29470, ISO 29770). It complements other test methods for dimensional, mechanical and moisture properties used in building insulation testing.
Keywords: ISO 29771:2008, organic content determination, thermal insulating materials, loss on ignition, building insulation testing, furnace test, production control, Euroclass A1.