What Is the Cone Calorimeter?

The Cone Calorimeter is an advanced, bench-scale fire testing instrument designed to evaluate the combustion characteristics, flame-retardant performance, and thermal behavior of materials and products under specified thermal-radiation conditions. Operating on the principle of oxygen consumption calorimetry, it has become one of the most significant tools in fire science and material development.

What Is the Cone Calorimeter Test?

The Cone Calorimeter Test (Standard Test Method for Heat and Visible Smoke Release Rates for Materials and Products Using an Oxygen Consumption Calorimeter) is a standardized procedure defined under major international standards such as ISO 5660-1, ASTM E1354, and GB/T 16172-2026. By exposing a specimen to a controlled level of radiative heat (ranging from 0 to 100 kW/m²), the test measures oxygen depletion in the exhaust stream to precisely determine heat release rates, ignitability, mass loss, and smoke production.

• Applicable Standards: ISO 5660-1, ISO 5660-2, ASTM E1354, ASTM E1474, ASTM E1740, ASTM D1550, ASTM D6113, BS 6873, GB/T 16172-2026, and IMO compliance standards.

Applicable Materials of Cone Calorimeter

The Cone Calorimeter is widely used across various industries to test and describe the reaction-to-fire performance of diverse materials, including:

• Building & Interior Materials: Wall linings, ceiling panels, construction composites, and general building products tested under ISO 5660 and GB/T 16172.
• Upholstered Furniture & Mattresses: Furniture components, composite cushions, and institutional or prison mattresses evaluated via ASTM E1474 and ASTM D1550.
• Transportation & Railway Components: Interior materials and components for railway vehicles (BS 6873) and maritime applications (IMO regulations).
• Wires and Cables: Electrical cables and insulated wiring assemblies tested under standards like ASTM D6113.

Main Functions and Cone Calorimeter Modules

The system integrates several core modular assemblies designed for precise thermal exposure, automated testing, and accurate data acquisition:

• Radiant Cone Module: Utilizes an imported electric heating tube (rated at 5000 W, output 0–100 kW/m²) wound into a truncated-cone shape. Equipped with three symmetrical K-type thermocouples and PID+SSR control to maintain uniform radiation (deviation ≤ ±2%) and a temperature control accuracy of ±10 °C.
• Automated Radiation Shield: Constructed from 6 mm non-water-cooled stainless steel, featuring fully automatic computer-controlled rapid insert-and-withdraw action to protect the specimen prior to testing.
• High-Precision Weighing Equipment: Integrated electronic weighing device (0–1000 g range, 0.1 g accuracy) with a double thermal-insulation design to keep the sensor at room temperature, ensuring precise mass-loss rate tracking.
• Comprehensive Data Acquisition: Directly measures and calculates critical fire parameters, including Heat Release Rate (HRR), Time to Ignition, Mass Loss Rate, Effective Heat of Combustion, Smoke Release Rate, and Toxic-Gas Release Rates (e.g., carbon oxides).

Technical Parameters of Cone Calorimeter

Important Notes

• Calibration & Baseline Stability: Ensure the weighing sensor and gas analyzers are fully calibrated prior to testing. During calibration, output drift on the weighing device must not exceed 1 g within 30 minutes.
• Thermal Safety: The radiant cone reaches high operating temperatures (up to 100 kW/m² heat output). Avoid direct contact with the cone heater and ensure proper ventilation and exhaust systems are operational.
• Standard Compliance: Select the correct incident heat-flux intensity and sample preparation methods based on the specific testing standard being followed (e.g., ISO 5660 vs. ASTM E1354).