ISO 18894 Method for Measuring Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR).
A dry coke sample of designated size and origin is reacted with CO2 gas in a retort at a specified elevated temperature for a specified length of time. Two indices, coke reactivity index (CRI) and coke strength after reduction (CSR) are determined using the reacted coke residue. The weight retained after reduction determines the CRI. The weight retained after sieving the tumbled reacted coke in a designated number of revolutions over a designated turning rate determines the CSR.

• Maximum operating temperature 1100 °C
• Three zone heating over 700 mm
• The test profile is controlled by the main temperature controller, which also controls both temperature and gas flow
• Dual loop cascade control
• Supplied with Inconel retort
• Over-temperature protection
• Flame failure gas safety system