Corning Pyrex Capillary Melting Point Tube Open Ends 0.2mm 1.5-1.8mm

Description

Product Overview

The Corning Pyrex capillary melting point tube is a specialized piece of laboratory glassware designed for accurate determination of melting points in a wide range of chemical and pharmaceutical substances. Constructed from high‑purity No 7740 borosilicate glass, the tube offers exceptional thermal stability, chemical resistance, and mechanical strength, making it suitable for repeated heating cycles without deformation or breakage. Each tube measures 100 mm in length with an outer diameter ranging from 1.5 mm to 1.8 mm and a wall thickness of 0.2 mm, providing a consistent internal volume that supports reproducible results. Both ends of the tube are left open, allowing for straightforward sample loading, capillary sealing, and easy removal after testing. The product is supplied in a pack of 100 tubes, ensuring laboratories have a reliable inventory for high‑throughput screening and routine quality control.

Usage

These capillary tubes are ideal for use in melting point apparatuses, differential scanning calorimeters (DSC), and other temperature‑controlled analytical instruments. Researchers in pharmaceutical development, organic synthesis, polymer science, and materials engineering rely on the precise temperature gradients achievable with Corning Pyrex tubes to verify compound purity, identify polymorphic forms, and assess thermal stability. The open‑end design simplifies sample introduction: a small amount of solid material can be placed directly into the tube using a micro‑spatula or a fine‑tipped syringe, then sealed with a flame or a specialized cap if required. The thin wall construction ensures rapid heat transfer, reducing equilibration time and improving measurement accuracy. Because the tubes are made from Pyrex glass, they can withstand temperatures up to 500 °C, covering the needs of most standard melting point determinations.

Why Choose Us

Choosing Corning Pyrex for your capillary melting point tubes means selecting a product backed by decades of glass‑technology expertise and a reputation for quality that is recognized worldwide. Each tube undergoes rigorous quality control inspections, including dimensional verification, wall‑thickness uniformity checks, and visual inspection for surface defects. The use of No 7740 glass guarantees low thermal expansion, minimizing dimensional changes during heating and cooling cycles, which directly translates to more reliable melting point data. In addition, Corning provides comprehensive technical support, offering guidance on optimal loading techniques, compatibility with various instruments, and troubleshooting assistance. Our commitment to sustainability is reflected in the recyclable nature of the glass, and we maintain a transparent supply chain that adheres to environmental and safety standards.

Key Features

• High‑purity No 7740 Pyrex glass delivers superior thermal stability and chemical resistance.
• Thin 0.2 mm wall ensures rapid heat transfer for faster, more accurate melting point measurements.
• Open‑end design simplifies sample loading and removal, reducing preparation time.
• Consistent 1.5‑1.8 mm outer diameter provides uniform internal volume for reproducible results.
• Comes in a pack of 100 tubes, supporting high‑throughput laboratory workflows.
• Rigorous quality control guarantees defect‑free glassware for reliable performance.
• Technical support and detailed usage guidelines are available from Corning experts.
• Eco‑friendly, recyclable glass material aligns with sustainable laboratory practices.

FAQ

What temperature range can these tubes withstand?

The Corning Pyrex capillary tubes are rated for continuous use up to approximately 500 °C, making them suitable for most standard melting point determinations and many high‑temperature applications.

Can the tubes be sealed after loading the sample?

Yes. After placing the sample into the open end, the tube can be sealed using a brief flame to melt the glass edge, creating a hermetic seal that prevents sample loss or contamination during heating.

Are the tubes compatible with all melting point apparatuses?

These tubes are designed to fit the majority of commercial melting point devices that accept standard 100 mm capillary tubes. However, it is always recommended to verify the tube holder dimensions of your specific instrument.

How should the tubes be stored to maintain their quality?

Store the tubes in a clean, dry environment away from direct sunlight and extreme temperature fluctuations. Keeping them in their original packaging until use helps protect them from accidental breakage.

What makes No 7740 glass different from regular glass?

No 7740 is a borosilicate glass formulation known for its low coefficient of thermal expansion, high resistance to chemical attack, and excellent durability under repeated heating cycles, which together ensure consistent performance in analytical applications.