20ml Glass Vials With Screw Caps - Leakproof Freezable Lab Vials

In this review the 20ml Glass Vials With Screw Caps are evaluated for lab and small-batch storage use; they are best for researchers, technicians and hobbyists who need compact, chemically resistant containers. The single biggest reason to buy is the combination of USP Type I borosilicate glass and assembled screw caps that deliver reliable sealing and low-extractable chemistry, making these vials suitable for storing solvents, small reagent samples, and frozen aliquots down to -70 degree Celsius.

Key Features

• Borosilicate glass: Low potassium and low sodium composition provides chemical stability for labs and analytical work.
• High temperature tolerance: Can be sterilized by heat at 121 degrees, which supports autoclave workflows and repeated sterilization.
• Freeze-safe: The glass tolerates freezing down to -70 degree Celsius, useful for long-term sample storage or cold-chain needs.
• Leakproof screw caps: Assembled with polypropylene caps and PE liners to reduce volatilization and prevent leakage during handling and transport.
• Chemical resistance: Suitable for common organic solvents such as alcohol and acetone, and for storing powders or small solid particles.

Who It's For

The vials are aimed at laboratory technicians, life science researchers, quality control teams, and small-scale pharmaceutical or industrial users who need consistent, low-extractable glass containers for samples and reagents. They are also convenient for education labs and makers who require small, durable bottles with dependable seals.

Those who should look elsewhere include users needing certified sterile single-use packaging out of the box or those requiring specialized septa, crimp tops, or syringe-cap access; these are assembled with standard polypropylene screw caps rather than specialized fittings.

Pros & Cons

Pros

• Conforms to USP Type I and ASTM E438 Type I Class A requirements, offering low-extractable performance for sensitive assays.
• Good thermal and chemical resistance allows autoclaving and storage with organic solvents without rapid degradation.
• Leakproof polypropylene caps with PE liners provide extended sealing to protect contents from volatilization.

Cons

• The screw-cap assembly is practical but does not replace specialized septa or crimp closures required for certain analytical instruments.
• Pack is bulk (100 pcs) which may be more than needed for infrequent or single-use hobby projects.

Specifications

Capacity	20 ml
Material	Type I borosilicate glass (Perex)
Cap type	24-400 polypropylene screw caps with PE liners
Temperature range	Freeze to -70 degree Celsius; sterilize to 121 degrees
Pack quantity	100 pieces per pack (500 pcs per case)
Chemical compatibility	Good for organic solvents such as alcohol and acetone

Our Verdict

These 20ml glass vials are a solid value for labs and small-scale users who need durable, low-extractable borosilicate containers with reliable screw-cap sealing. They balance chemical resistance, thermal tolerance and practical sealing at a bulk pack size, making them a sensible choice for routine sample storage, reagent aliquots, and frozen samples.

Frequently Asked Questions

Can these vials be autoclaved?
Yes, the borosilicate glass can be sterilized by heat at 121 degrees and withstands standard autoclave cycles.

Are the caps leakproof for transport?
The polypropylene screw caps with PE liners provide strong sealing to reduce leakage and volatilization for normal handling and transport.

Can they store solvents?
Yes, they are suitable for common organic solvents such as alcohol and acetone thanks to the chemical resistance of the glass and liner materials.