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Selecting the appropriate capillary lab tubes is crucial for maintaining accuracy and reliability in scientific research and medical diagnostics. The right choice can significantly impact the integrity of samples, ensuring precise results and preventing contamination or measurement errors. Understanding the key features and specifications of these essential laboratory tools is vital for any professional in the Industrial & Scientific > Lab & Scientific Equipment sector.
Package Inclusion: unravel the experience with our 200 piece glass capillary tubes; Each tube boasts a compact length of 2.95 inches (75 mm), offering precision with an inner diameter of 0.04 inch (1.1 mm) and an outer diameter of 0.06 inch (1.5 mm)
Efficient Sampling: designed for effortless sampling, the capillary tube promises accurate and consistent sample collection; Sampling in small volume reaction window vessels is its main purpose; The set can meeting your need of quantity
Quality Can Trust: crafted from quality glass, these glass tubes deliver the reliability demanded by rigorous scientific applications; It is clear for your operation and easy to clean and store, supporting your precise sample extractions and experiments
Intuitive and Hassle Less Operation: experience the easy usage of our capillary glass pipette; The straightforward design ensures smooth operation every time; The compact size allows for convenient handling, making your laboratory processes efficient
Ample Pack of 1000: the package includes 1000 pieces of glass capillary tube, making it an ideal solution for bulk usage in labs; They can support a wide range of lab applications and analysis that requires precision and accuracy
Melting Point Detection: the glass pack is not only designed for thin layer analysis, but also suitable for detecting melting points of various substances; This feature makes them an indispensable component in scientific experiment
Quality Material and Detailed Specification: crafted from glass, these transfer pipettes ensure durability and nice performance in laboratory settings; They have a specific length of 100 mm, with an inner diameter of 0.3mm, an outer diameter of 0.5mm
Ideal for Laboratory Analysis: experience thin layer analysis with the capillary tube; Their clear, smooth surface allows for easy operation, making them an essential tool for any laboratory
Precision Glass Tubes: Eisco Borosilicate Glass Capillary Tubes deliver reliable and consistent melting point results for professionals and educators. Each tube measures 4 inches long with a 0.05-inch diameter, ideal for precise capillary tube...
Efficient Tube Dispensing: A convenient dispensing lid releases one glass capillary tube at a time to streamline your workflow and maintain order. This feature minimizes clutter, making it perfect for busy lab environments or organized storage needs
High-Temperature Resilience: Engineered to withstand high temperatures, these glass capillary tubes feature specific strain, annealing, and softening points. The detailed limits ensure they perform reliably in demanding thermal shock conditions
Borosilicate Durability: Constructed from premium borosilicate glass, these capillary tubes are perfect for harsher lab settings. Their chemical resistance makes them suitable for various applications in professional chemistry labs
【Specifications】: Each contains 1,000 capillary tubes; each is 100mm in length; inner diameter (ID): 0.3mm; outer diameter (OD): 0.5m; diameter tolerance: 0.1mm
【Material】: The capillary tube is made of glass; Due to its tiny diameter, please handle it gently.
【Quality】: It features fine craftsmanship, simple operation, transparent, colorless and smooth surfaces; provides adequate supply for multiple experiments or projects.
【Application】: Laboratory-grade glass capillary tube is mainly used for sampling small-volume reaction containers and TLC plates; Widely applied in organic, analytical and other thin layer points to represent liquid substances.
Package Inclusion: unravel the experience with our 500 piece glass capillary tubes; Each tube boasts a compact length of 2.95 inches (75 mm), offering precision with an inner diameter of 0.04 inch (1.1 mm) and an outer diameter of 0.06 inch (1.5 mm)
Efficient Sampling: designed for effortless sampling, the capillary tube promises accurate and consistent sample collection; Sampling in small volume reaction window vessels is its main purpose; The set can meeting your need of quantity
Quality Can Trust: crafted from quality glass, these glass tubes deliver the reliability demanded by rigorous scientific applications; It is clear for your operation and easy to clean and store, supporting your precise sample extractions and experiments
Intuitive and Hassle Less Operation: experience the easy usage of our capillary glass pipette; The straightforward design ensures smooth operation every time; The compact size allows for convenient handling, making your laboratory processes efficient
Generous 1000-Pack: Includes 1000 glass capillary tubes (0.3mm ID, 0.5mm OD) in one canister. Ideal for high-volume lab use, these precision-sized tubes ensure accuracy and reliability for diverse testing and analytical experiments.
Versatile Applications: Crafted from borosilicate glass, these capillary tubes excel in both TLC spotting and melting point detection. An essential tool for diverse physical and chemical experiments, they deliver reliable performance across various...
Precision Inorganic Craftsmanship: Made of durable borosilicate glass for reliable lab performance. Dimensions: 100mm length, 0.3mm ID, 0.5mm OD. Precise sizing ensures high accuracy for all your scientific experiments and analysis needs.
Easy to Use: Designed for single-use to eliminate tedious post-experiment cleaning. Ends seal easily with a flame, making these tubes versatile for diverse analytical requirements and saving you valuable time in the lab.
Ample Pack of 1000: the package includes 1000 pieces of glass capillary tube, making it an ideal solution for bulk usage in labs; They can support a wide range of lab applications and analysis that requires precision and accuracy
Melting Point Detection: the glass pack is not only designed for thin layer analysis, but also suitable for detecting melting points of various substances; This feature makes them an indispensable component in scientific experiment
Quality Material and Detailed Specification: crafted from glass, these transfer pipettes ensure durability and nice performance in laboratory settings; They have a specific length of 100 mm, with an inner diameter of 0.5 mm, an outer diameter of 0.7 mm
Ideal for Laboratory Analysis: experience thin layer analysis with the capillary tube; Their clear, smooth surface allows for easy operation, making them an essential tool for any laboratory
【Premium Glass Material】 Made from high-quality borosilicate glass, these capillary tubes offer excellent durability and heat resistance for reliable lab performance.
【Precise Dimensions for Accuracy】 Each tube measures 75mm in length with 1.1mm ID × 1.5mm OD, ensuring consistent sample volumes for accurate TLC spotting and melting point tests.
【Open Both Ends Design】 Double-opened ends allow easy sample loading and smooth liquid flow, making them ideal for micropipette applications and various laboratory procedures.
【200 Pcs Value Pack】 This bulk pack of 200 glass pipettes provides excellent value for labs, schools, and research facilities with high-volume usage needs.
500 per pack capillary tubes, 0.5 mm inner diameter, 0.75 mm outer diameter, 100mm length. Made of borosilicate glass
As shown in photos, approximate spotting volume as tested for dichloromethane is 15mm x (0.25mm)² x 3.14 = 3µL, for acetone is 25mm x (0.25mm)² x 3.14 = 5µL, and for water is 45mm x (0.25mm)² x 3.14 = 9µL.
Testing method used is placing the tube at a straight up angle with only the tip submerged in the liquid and allowing the liquid to keep on climbing until it stops.
Upgraded convenient packaging with a 1.5mm diameter hole on cap for easy tube drawing without need to open the cap or keeping it open all the time.
Last update on 2026-10-15 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Capillary Lab Tubes
Material and Coating Considerations
Glass vs. Plastic: Capillary tubes are commonly made from either glass or plastic. Glass tubes offer excellent optical clarity and chemical resistance, making them ideal for precise measurements and applications where material inertness is critical. Plastic tubes, often made from borosilicate glass or soda lime glass, provide a safer, shatter-resistant alternative, reducing the risk of sharps injuries and sample loss.
Heparinized vs. Plain: For blood collection, tubes are available with or without an anticoagulant coating. Heparinized tubes contain an inner coating of heparin (e.g., ammonium heparin or sodium heparin) to prevent blood clotting, making them suitable for hematocrit determinations and other blood tests requiring whole blood. Plain tubes are uncoated and are used for applications where clotting is desired or where no anticoagulant is needed.
Volume and Dimensions
Capacity: These tubes come in various capacities, typically ranging from a few microliters to several milliliters. Common sizes include micro-hematocrit tubes (around 75mm length, 1.1-1.2mm ID) designed for specific blood volume measurements. Always match the tube's capacity to the required sample volume to ensure optimal filling and accurate results.
Length and Diameter: Standard lengths for capillary tubes are often 75mm or 100mm, with internal diameters varying to suit different applications. Consider the equipment you will be using (e.g., centrifuges, readers) to ensure compatibility with the tube's dimensions. Precise inner and outer diameters are critical for consistent sample collection and analysis.
Safety Features and Certifications
Sterility: For sensitive applications, such as cell culture or microbiology, sterile tubes are essential to prevent contamination. Look for products certified as sterile, often indicated by specific packaging or documentation.
Color-Coding: Many capillary tubes are color-coded to indicate their specific features. For instance, red tips often signify heparinized tubes, while blue tips typically denote plain tubes. This visual cue helps prevent errors in the laboratory.
Compliance: Ensure tubes meet relevant industry standards, such as ISO certifications (e.g., ISO 12772 for micro-hematocrit tubes), which guarantee quality and performance specifications. Some tubes may also be designed with safety features like plastic sheaths to minimize breakage and biohazard exposure.
Packaging and Quantity
Dispenser Packs: Many manufacturers offer capillary tubes in convenient dispenser packs, which allow for easy, single-tube dispensing without contaminating the remaining tubes. This can improve workflow efficiency and maintain sterility.
Bulk vs. Smaller Quantities: Depending on your laboratory's usage volume, tubes are available in bulk boxes (e.g., 1000 or more per box) or smaller packs. Consider your consumption rate to optimize cost-effectiveness and storage space.
Frequently Asked Questions
What is the primary difference between heparinized and plain capillary tubes?
Heparinized capillary tubes contain an anticoagulant (heparin) on their inner surface, which prevents blood from clotting. Plain tubes, on the other hand, do not have this coating and allow blood to clot naturally. The choice depends on whether whole blood or clotted blood/serum is required for the specific test.
Why are some capillary tubes color-coded?
Color-coding is a standard practice to quickly identify the tube's contents or features, reducing the risk of errors in a busy lab environment. For example, red often indicates a heparinized tube, while blue typically signifies a plain, uncoated tube. This visual cue helps ensure the correct tube is used for the intended application.
Are plastic capillary tubes better than glass tubes?
Neither is inherently 'better' as it depends on the application. Plastic tubes offer greater safety due to their shatter-resistant properties, reducing the risk of injury and sample loss. Glass tubes, however, often provide superior optical clarity and chemical inertness, which can be critical for certain precise measurements or sensitive chemical reactions.
Can capillary tubes be reused?
Capillary tubes are generally designed for single-use applications, especially when handling biological samples or in sterile environments. Reusing tubes can lead to cross-contamination, inaccurate results, and compromise the integrity of subsequent samples. Always dispose of used tubes properly according to laboratory safety protocols.
How do I choose the correct volume for my capillary tube?
To choose the correct volume, consider the amount of sample required for your specific test and the capacity of your analytical equipment. For instance, micro-hematocrit tubes are specifically sized for hematocrit determination. Always ensure the tube's volume is sufficient for the sample without being excessively large, which could lead to waste or inefficient processing.
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