250 mL PP Centrifuge Tubes with Plug Seal Cap, Sterile，6/pk, 102/cs

Made of USP VI polypropylene. Autoclave at 120C /15 Ib. Non-pyrogenic, Dnase/Rnase and human DNA free. Round Bottom, Self-standing. Autoclavable. Sterilized by E-beam, SAL=10-6 . Clear graduations and white marking area. Recommend to store in gas phase of the nitrogen tank. Internal thread Cap: Special screw cap designed with silicone O-ring to secure the sealing under various condition. External thread Cap: Special screw cap designed without silicone ring to avoid risk of contamination. (102 per CS )