https://www.mdhcbiotech.com/products/centrifuge-test-tube/ MDHC Centrifuge tubes are specially constructed to withstand very high relative centrifugal forces (RCF), some types up to 20,000xg RCF. FAQs of Centrifuge Test Tube Why the centrifuge tube is conical base? Conical bases to permit easier sample or pellet retrieval after spin-down.