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These test tubes are produced from Type 3.3 borosilicate glass, conforming to ISO 3585 specifications. The glass composition contains approximately 80.6% SiO₂, 12.6% B₂O₃, 4.0% Na₂O+K₂O, and 2.2% Al₂O₃ by weight. This formulation results in a linear coefficient of thermal expansion of 3.3 × 10⁻⁶/K (20-300°C range).
Type 3.3 borosilicate glass demonstrates resistance to water, acids, and neutral solutions per ISO 719 (hydrolytic class HGB 1) and ISO 1776 (acid class 1). Alkali resistance meets ISO 695 class A2 requirements. Leached alkali content remains below 100 μg Na₂O per gram of glass surface under standard extraction conditions, which contributes to pH stability for stored aqueous samples.
Borosilicate glass test tubes support continuous operation at temperatures up to 350°C. Short-term exposure may reach 500°C for limited-duration heating procedures. All tubes undergo a controlled annealing process at approximately 560°C to reduce internal residual stress.
Thermal shock resistance is measured by the temperature difference (ΔT) that the glass can withstand without fracture when rapidly cooled. Type 3.3 borosilicate glass withstands a thermal shock differential of approximately 210°C. This property supports direct heating over open flames and subsequent handling at room temperature.
Wall thickness measures approximately 1.0 mm across standard catalog sizes, with tolerance of ±0.1 mm. Round-bottom tubes feature uniform wall distribution at the hemispherical base. Each tube is inspected for wall thickness consistency and bottom centering during production.
Tube rims receive fire-polished treatment to produce smooth edges with surface roughness below Ra 0.8 μm. Light transmittance exceeds 90% across the visible spectrum for clear observation of sample color changes and reaction progress.
Code NO. | Specification | Bottom | Material | Packing |
|---|---|---|---|---|
HP1021 | ∅12x60mm | Round bottom | Borosilicate Glass 3.3 | 500pcs/polybag, 5000pcs/case |
HP1022 | ∅12x75mm | Borosilicate Glass 3.3 | 500pcs/polybag, 5000pcs/case | |
HP1023 | ∅13x75mm | Borosilicate Glass 3.3 | 500pcs/polybag, 5000pcs/case | |
HP1024 | ∅13x100mm | Borosilicate Glass 3.3 | 150pcs/polybag, 3000pcs/case | |
HP1025 | ∅15x100mm | Borosilicate Glass 3.3 | 150pcs/polybag, 2500pcs/case | |
HP1026 | ∅15x150mm | Borosilicate Glass 3.3 | 100pcs/polybag, 2000pcs/case | |
HP1027 | ∅18x150mm | Borosilicate Glass 3.3 | 100pcs/polybag, 1500pcs/case | |
HP1028 | ∅20x150mm | Borosilicate Glass 3.3 | 100pcs/polybag, 1200pcs/case | |
HP1029 | ∅25x150mm | Borosilicate Glass 3.3 | 50pcs/polybag, 1000pcs/case | |
HP1030 | ∅30x200mm | Borosilicate Glass 3.3 | 25pcs/polybag, 500pcs/case |
Optional cork or silicone stoppers are available for sizes ranging from 5 mL to 50 mL nominal volume.
Borosilicate glass test tubes serve as reaction vessels for qualitative chemical analysis, sample digestion, and reagent mixing. Their thermal stability supports water bath and dry block heating procedures in environmental testing and industrial quality control laboratories.
In microbiology workflows, these tubes accommodate broth culture and sample storage. Autoclavable at 121°C, they support standard laboratory sterilization cycles. For clinical and blood bank operations, the glass provides inert sample containment with minimal ion leaching into stored specimens.
