Specifications

Stoppered Test Tube · Specifications

The following are standard capacity options with commonly used diameter×length nominal values. Custom sizes are available upon request.

Request custom specs

Nominal Capacity (mL)	Common OD×Length (mm)	Packaging (pcs/case)	Sealing Type	Material
5	13×100	600	Ground Glass Stopper	Borosilicate 3.3
10	15×100 / 16×125	600	Ground Glass Stopper	Borosilicate 3.3
15	16×150 / 18×150	600	Ground Glass Stopper	Borosilicate 3.3
20	18×180 / 20×150	300	Ground Glass Stopper	Borosilicate 3.3
25	20×200 / 25×150	300	Ground Glass Stopper	Borosilicate 3.3
30	25×200 / 30×200	300	Ground Glass Stopper	Borosilicate 3.3

* OD×Length are nominal values. Actual dimensions may vary slightly.
* Custom capacities and special sizes available upon request.
* Each tube includes an individually matched ground glass stopper — do not interchange.

Sealing Technology: The ground glass stopper and tube mouth are precision-matched for consistent sealing performance. Each stopper is individually paired with its tube — do not interchange to maintain seal integrity. For higher sealing requirements, PTFE stoppers are available as an alternative.

Product Description

Stoppered test tubes are an essential upgrade to standard plain test tubes, featuring a precision-ground glass stopper that provides an airtight seal. Manufactured from high-quality borosilicate glass 3.3, the ground glass stopper is individually matched to each tube, ensuring a secure seal that effectively prevents sample evaporation, oxidation, and contamination. Combining the versatility of standard test tubes with sealed storage functionality, stoppered test tubes are essential tools for sample preservation, standard solution storage, and volatile reagent handling.

Key Features

Borosilicate Glass 3.3: ISO 3585 compliant · Low thermal expansion · Thermal shock resistance up to 280°C · Resistant to acids and alkalis
Ground Glass Stopper: Precision-ground for an airtight seal · Prevents evaporation and contamination
Oxidation Prevention: Airtight seal effectively isolates samples from air, preventing oxidation
Versatile Use: Functions as both a regular test tube and a sealed storage vessel
High Clarity: High-purity glass enables clear observation of sample state and color changes
Autoclavable: 121°C / 15 psi / 20 minutes steam sterilization
Matched Stoppers: Each stopper is individually ground to its tube for optimal sealing performance

Value Proposition: Stoppered test tubes = Standard test tube + Sealed storage capability. The integrated ground glass stopper provides secure sealing without the need for separate rubber stoppers or sealing films — ideal for volatile sample storage, standard solution preservation, and oxidation-sensitive experiments.

Quality Assurance

Each stoppered test tube set (tube + stopper) undergoes rigorous dimensional inspection, seal integrity testing, and visual inspection. Stoppers are precision-ground and individually matched to their tubes to ensure consistent sealing performance. Our products meet laboratory glassware quality standards.

Note: Stoppers are individually matched to each tube — do not interchange to ensure proper sealing. Verify the stopper fits smoothly without wobbling or binding before use. For long-term storage, place a small piece of lint-free paper between stopper and tube to prevent sticking.

Applications

Typical Application Areas

Standard Solution Storage

Sealed preservation of prepared standard solutions to prevent concentration changes and contamination

Volatile Sample Storage

Organic solvents, volatile reagents, flavors, and fragrances requiring airtight sealing

Oxidation Prevention

Storage of oxygen-sensitive materials (reducing reagents, indicators, etc.)

Sample Collection & Transport

Temporary sealed storage and transport of experimental samples between labs

Education

Sample preservation training in student laboratory courses

Pharmaceutical QC

Standard solution storage, stability study sample aliquoting

Stoppered vs Plain Test Tube

Sealing Stoppered tubes provide airtight sealing; plain tubes require separate closures
Evaporation Prevention Stoppered tubes effectively prevent evaporation; plain tubes allow evaporation
Contamination Protection Stoppered tubes isolate from contamination; plain tubes are open to contamination
Convenience Stoppered tubes are easy to open/close; plain tubes require separate stopper handling
Selection Choose stoppered for sealed storage; choose plain for routine operations

Tip: Stoppered test tubes are the sealed storage upgrade of plain test tubes — ideal for applications requiring sealed storage and evaporation prevention. For applications requiring both graduations and sealing, choose Graduated Stoppered Test Tubes.