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Spylx centrifuge Tubes 15mL, 100 Pcs Sterile Plastic Test Tubes with Screw Caps, Polypropylene Container with Graduated and Write-on Spot, Non-Pyrogenic, DN/RNase Free.15ml conical centrifuge tube, made of high-purity PP material, maximum RCF: 9,400, can be autoclaved at 122?, can be frozen to -80?.Longer screw cap, used to prevent sample leakage, smooth and flat inner surface, no residual solution.The PP conical centrifuge tube is sterilized by gamma radiation or EO.The easy-to-read scale is accurate to ±2% in increments of 1mL.With a large, hard-to-matte white printing and writing area to make the mark clear and easy to read, the scale and writing area are resistant to chloroform.