GB/T 3780.4-2008 "carbon black - Part 4: Determination of oil absorption value of compressed samples", specifies the determination method of oil absorption value of carbon black compressed samples. The standard specifies the requirements of equipment and reagents, elaborates the sample prepative, compression operation and oil absorption value measurement steps, standardizes the result calculation and Data processing method, provides a unified standard for accurately determining the oil absorption value of carbon black compressed samples, helps evaluate the structural performance of carbon black, and guides the quality control and performance evaluation of carbon black production and related Applications.