Product Description Biolandâ„¢ 15mL and 50mL Conical Sterile Polypropylene Centrifuge Tubes 15mL & 50mL Conical Sterile Polypropylene Centrifuge Tubes are premium, high-quality conical tubes that are environmentally friendly, offer the highest cleanliness with a recyclable plastic rack; increased traceability with the large writing area. Labware Products are made from high-purity resins and molded using our state-of-the-art processes. Nonpyrogenic: Endotoxin tested (0.6 EU/mL) Non-Cytotoxic Biologically inert: USP biological reactivity class VI High level of sterility: SAL 10-6 RNase/DNase-free Leak proof Made from virgin resins and molded using state-of-the-art processes; 50ml provides Skirted-bottom self-supporting type. 50ml maximum centrifugal force:17000xg. 15ml maximum centrifugal force: 13500xg. Available in bag and rack styles Available in polystyrene for blood research applications Certifications