Screw Cap Microcentrifuge Tubes

# Screw Cap Microcentrifuge Tubes, Self-Standing, with O-Ring Seal

ZHCLAB Screw Cap Microcentrifuge Tubes provide a superior sealing solution for sample storage, organic solvent handling, and long-term preservation applications. The precision screw cap design delivers a leak-proof O-ring seal that snap-cap tubes cannot match – making these tubes the preferred choice for volatile samples, extended storage, and applications requiring maximum containment security.

## Key Features

**Leak-Proof O-Ring Screw Cap**
Each tube ships assembled with cap and integrated O-ring seal. The threaded screw cap with O-ring creates a mechanically secure, airtight closure that prevents evaporation, leakage, and cross-contamination during storage and centrifugation – critical for organic solvents, volatile reagents, and long-term sample archives where snap-cap failure is not acceptable.

**High-Force Centrifugation Compatible**
Rated to withstand centrifugal forces up to 20,000 x g, supporting high-speed microcentrifuge protocols including protein pelleting, cell harvesting, and nucleic acid precipitation without tube deformation or cap failure.

**Virgin Polypropylene Construction**
Manufactured from virgin polypropylene (PP) for superior chemical resistance against acids, bases, alcohols, DMSO, and most common laboratory reagents. The inert surface minimizes sample adsorption and ensures compatibility across biological and chemical applications.

**Autoclavable**
Compatible with standard autoclave sterilization at 121deg C, allowing in-house sterilization when sterile conditions are required.

**Certified Purity**
DNase free, RNase free, and pyrogen free. Safe for nucleic acid work, protein assays, and sensitive biological sample storage.

**Self-Standing Base**
Skirted self-standing base allows tubes to remain stable on the benchtop without a rack – simplifying filling, labeling, and retrieval in high-throughput workflows.

**Graduated Markings and Writing Area**
Frosted writing area for sample identification. Graduation marks allow direct volume reading without transferring to a measuring tube.

**Tube Geometry**
– *0.5mL (Conical Bottom):* Conical base concentrates pelleted material to a defined point for efficient and complete recovery after high-speed centrifugation. Ideal for small-volume enzyme aliquots, reagent storage, and nucleic acid work.
– *1.5mL (Conical Bottom):* Standard conical base design for maximum pellet recovery and compatibility with the widest range of microcentrifuge protocols. The most versatile format for everyday molecular biology workflows.
– *2.0mL (Round Bottom):* Rounded interior base is ideal for larger sample volumes, reagent storage, and applications where full sample recovery from a curved base is preferred. The cylindrical body maximizes usable volume.

## Technical Specifications
– **Material:** Virgin polypropylene (PP)
– **Cap:** Assembled screw cap with integrated O-ring
– **Base:** Self-standing skirted
– **Color:** Natural/Clear

## Common Applications
– Long-term storage of DNA, RNA, protein, and enzyme samples
– Organic solvent and volatile reagent storage