Description
Fisherbrand Disposable Borosilicate Glass Culture Tubes with Threaded End – 20 mm OD x 150 mm Length, 30 mL Volume, 18-415 Thread Size, Round Bottom (MPN: 14-957-76E)
The Fisher Scientific 14-957-76E (part of the core Fisherbrand clinical consumable line) is an industry-standard, laboratory-grade disposable glass culture tube featuring an external threaded neck finish. Measuring 20 mm Outside Diameter (OD) by 150 mm in length with a total working capacity of 30 mL, these large-volume tubes are precision-engineered from high-purity Type I, Class B borosilicate glass. This premium glass matrix delivers outstanding thermal shock resistance and superior chemical durability against aggressive acids, alkalis, and organic extraction solvents. Outfitted with an 18-415 GPI thread profile, they are designed to couple seamlessly with reusable phenolic or polypropylene screw caps to establish a vapor-tight mechanical seal. This makes them a reliable choice for tissue cultures, chemical synthesis, centrifugation, and biological sample archiving.
Technical Performance and Design
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Premium Type I Class B Borosilicate Glass: Conforms strictly to USP Type I and ASTM E438, Type I, Class B specifications. This low-expansion formulation features excellent resistance to physical shattering or thermal cracking when exposed to drastic, rapid temperature adjustments or repeat high-pressure autoclave environments.
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Chemically Inert Flow Path: Resistant to chemical leaching and internal pH drifts. The ultra-pure interior surface prevents secondary ion absorption or alkaline extraction, keeping delicate biological matrices, fluid reagents, and standard chemical reactions completely unadulterated.
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Standardized 18-415 Thread Profile: The precision-molded screw neck accommodates standard 18-415 GPI laboratory caps (such as pulp/vinyl or PTFE-lined closures). This ensures a spill-proof, evaporation-resistant seal during long-term storage or aggressive vortexing loops.
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Uniform Wall Thickness Integrity: Precision-drawn glass walls eliminate localized structural thin spots. This architectural uniformity allows the 30 mL tubes to sit stably inside standard centrifuge rotors or heating blocks and withstand baseline spinning velocities without fracturing.
Product Specifications
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Catalog Number / MPN: 14-957-76E (Also tracked under wholesale ID 1495776E)
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Manufacturer / Brand: Fisher Scientific / Fisherbrand
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Outer Diameter (OD): 20 mm
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Physical Tube Length: 150 mm
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Total Volumetric Capacity: 30 mL (30 milliliters)
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Material Composition: Type I, Class B Low-Expansion Borosilicate Glass
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Base Geometry Profile: Round Bottom (U-Bottom Format)
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Neck Finish Style: External Threaded End (Screw Neck – Caps Sold Separately)
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Thread Size Dimension: 18-415 GPI standard
- Sterility / Regulatory Profile: Non-Sterile bulk components; fully autoclavable up to 121 degrees Celsius and safe for deep mechanical freezers
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Standard Case Configuration: Wholesale master case containing 1,000 tubes total (Packed neatly in protective nested foam trays)
Key Benefits and Applications
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Bacteriological and Tissue Culture Work: The preferred large-format tube for preparing deep agar slants, scaling up bacterial suspensions, or processing tissue samples under biological safety hoods.
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Clinical Extraction and Sample Archiving: Widely deployed across diagnostic testing facilities, blood banks, and organic chemistry labs for solvent extractions, clinical dilutions, and chemical reagent storage.
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Rigid Nested Tray Packaging: Shipped from the factory in heavy-duty trays that prevent glass-on-glass friction and block ambient storage dust, allowing for tidy, contamination-free storage on warehouse shelves.
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High Optical Instrument Clarity: Completely free of bubbles, striations, or glass distortions, providing a crystal-clear path for optical assays, colorimetric tracking, and visual inspection protocols.
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