Description
Precision Begins With the Vessel.
In laboratories, apothecaries, craft studios, and kitchens alike, the container is never merely a container. It is the interface between substance and measurement — the boundary that defines evaporation rate, reaction surface area, thermal tolerance, and contamination risk. The Vialist is a curated collection of borosilicate glass test tubes, spanning 15 ml to 100 ml, designed for those who understand that the quality of the glass determines the integrity of what it holds. This is not a generic assortment of disposable labware. It is a precision toolkit for anyone who needs thermal shock resistance, optical clarity, chemical inertness, and dimensional consistency across every vessel in the rack.
Borosilicate glass — the same material family as Pyrex and laboratory-grade Schott DURAN — is the defining material choice here. With a coefficient of thermal expansion approximately one-third that of soda-lime glass, these tubes transition from freezer (-40°C) to direct flame without shattering. The low alkali content means no sodium leaching into sensitive aqueous solutions, no metallic ion contamination in botanical extractions, and no flavor transfer in culinary applications. Each tube is annealed after forming, relieving internal stresses that would otherwise cause spontaneous fracture weeks or months after manufacture — the silent failure mode of cheap import glass that gives borosilicate its reputation as the professional's material.
The included cork stoppers are not an afterthought — they are natural, compressible, and provide a micro-porous seal that allows trace gas exchange without admitting dust or insects. For applications where absolute airtightness is required, the cork can be wax-dipped or replaced with a rubber stopper (not included). The 24-piece set covers the full practical spectrum: 15 ml for small-batch essential oil blending, 25 ml for spice and herb storage, 35-50 ml for propagation cuttings and specimen display, and 80-100 ml for bulk dry goods, bath salts, and large-volume tinctures. The uniform 18 mm mouth diameter across all sizes means one cork size fits all — a small but significant detail when you are reaching for a stopper with wet hands or latex gloves.
Measure with clarity. Store with confidence. The Vialist ensures the vessel never compromises the work.
Key Features
Technical Specifications
- Material: Borosilicate Glass 3.3 (Low-Expansion, High Thermal Resistance)
- Capacities Included: 15, 25, 30, 35, 40, 45, 50, 55, 60, 80, 100 ml
- Quantity: 24 Tubes + 24 Cork Stoppers (48 Pieces Total)
- Mouth Diameter: 18 mm (Uniform Across All Sizes)
- Stopper Material: Natural Cork (Compressible, Micro-Porous)
- Thermal Range: -40°C to +525°C (Direct Flame Safe)
- Coefficient of Thermal Expansion: 3.3 × 10⁻⁶/K
- Alkali Content: Low (<0.1% Na₂O Equivalent)
- Manufacturing Process: Machine-Formed + Post-Forming Annealing
- Cleaning: Dishwasher Safe, Autoclavable at 121°C
Application Scenarios
The Vialist serves a remarkably diverse user base united by their need for precision containment. Home apothecaries and herbalists use the 15-30 ml tubes for tincture and essential oil blending, the 50 ml for dried herb storage, and the 100 ml for bulk infusion batches. Craft bartenders and mixology enthusiasts create flight-style tasting presentations with bitters, syrups, and infused spirits arranged by volume in a wooden rack (not included). Plant propagators use the 35-50 ml tubes as water-rooting vessels for cuttings — the optical clarity allows root development monitoring without disturbing the cutting. Science educators and homeschool parents have a complete set of lab-grade vessels for chemistry demonstrations, pH testing, and crystal-growing experiments. Wedding and event designers use the tubes as bud vases, place-card holders, and favor containers — the uniform 18 mm mouth accepts standard taper candles as well. This is not a single-use product. It is twenty-four precision instruments in a box, and each one finds its calling in a different discipline.
Frequently Asked Questions
Q: Can these tubes be boiled or autoclaved?
A: Yes. Borosilicate glass is autoclave-safe at 121°C and can be boiled directly in water. The cork stoppers should be removed before sterilization — cork is not autoclavable and may degrade with repeated boiling.
Q: Are the cork stoppers truly airtight?
A: Natural cork provides a micro-porous seal — it blocks dust and insects while allowing minimal gas exchange, which is ideal for fermentation, curing, and aging applications. For applications requiring absolute airtightness, you can wax-dip the cork tops or substitute with size-00 rubber stoppers (not included).
Q: Is borosilicate glass really worth the premium over regular glass?
A: For thermal applications (freezer-to-flame, boiling, autoclaving), absolutely. Soda-lime glass will shatter under these conditions. For chemical applications, borosilicate's low alkali content prevents sodium leaching that can alter solution pH and contaminate extractions. For longevity, the annealing process eliminates internal stresses that cause delayed spontaneous fracture. If your use case involves heat, chemicals, or long-term storage of valuable contents, borosilicate is not a luxury — it is insurance.
Q: Can I write on these tubes for labeling?
A: Yes — use a white or metallic permanent marker, china marker (grease pencil), or adhesive labels. For laboratory use requiring solvent resistance, etch the glass with a diamond-tip pen or use chemical-resistant labeling tape.
Q: What is the wall thickness of the tubes?
A: Wall thickness ranges from approximately 0.8 mm (15 ml) to 1.2 mm (100 ml). This is standard for laboratory-grade test tubes — thick enough for thermal resilience and mechanical handling, thin enough for efficient heat transfer during heating and cooling procedures.
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