Randell Cap Tube .044 X 144 with Drier and OEM Replacement RP CAP022

Description

Product Overview

The Randell Cap Tube .044 X 144 mm is engineered for precision scientific work, featuring a built‑in drier that eliminates moisture buildup during prolonged experiments. Crafted from high‑quality borosilicate glass, the tube offers exceptional thermal resistance and chemical inertness, ensuring that it does not interact with reagents or alter experimental outcomes. The tube dimensions—0.044 inch internal diameter and 144 mm length—provide a standard format that fits seamlessly into existing capillary tube racks, holders, and analytical instruments. The integrated drier is a miniature silica gel element positioned at the tube’s base, allowing continuous drying of the sample column without the need for external drying apparatus. This OEM part (model RP CAP022) matches the original Randell specifications, guaranteeing identical performance, fit, and finish. The product weight of 9.1 ounces and compact 5 × 5 × 8 inches packaging make it easy to store and handle in busy laboratory environments.

Usage

Designed for a wide range of laboratory applications, the Randell Cap Tube is ideal for chromatography, electrophoresis, micro‑extraction, and analytical chemistry procedures that require precise fluid handling. Researchers in chemistry, biochemistry, environmental testing, and pharmaceutical development rely on capillary tubes to separate compounds, analyze reaction kinetics, and conduct microscale assays. The built‑in drier is especially valuable in humidity‑sensitive protocols such as gas chromatography or thin‑layer chromatography, where moisture can cause peak broadening or sample degradation. The tube can be used in standard heating blocks, water baths, or oven settings up to 300 °C, making it compatible with both low‑temperature and high‑temperature workflows. Its robust glass construction tolerates repeated cleaning cycles, including acid washes and autoclaving, without compromising integrity. Whether you are preparing standards, running pilot experiments, or scaling up to high‑throughput analysis, this capillary tube delivers consistent performance and reliable sample integrity.

Why Choose Us

Choosing the Randell OEM replacement ensures that you receive a component that adheres to the same stringent quality standards as the original equipment. Each tube undergoes rigorous inspection for dimensional accuracy, glass clarity, and drier functionality, reducing the risk of defects that could jeopardize experimental results. Because the part is manufactured by the original brand, it maintains full compatibility with existing Randell accessories, preserving the integrity of your laboratory setup and avoiding costly retrofits. Using genuine OEM parts also safeguards your equipment warranty, as manufacturers typically recognize only authentic components as valid for warranty claims. In addition, Randell provides responsive technical support and a clear return policy, giving you confidence that any issues will be addressed promptly. By investing in a verified OEM replacement, you benefit from reduced downtime, enhanced reproducibility, and long‑term cost savings compared to aftermarket alternatives.

Key Features

• Exact OEM fit ensures seamless integration with existing Randell lab equipment.
• Integrated silica‑gel drier prevents moisture accumulation, improving sample stability.
• High‑grade borosilicate glass offers superior thermal resistance and chemical inertness.
• Standard .044 inch diameter and 144 mm length provide universal compatibility across capillary applications.
• Dedicated customer support and warranty‑friendly design give peace of mind for long‑term use.

FAQ

What does the built‑in drier do?

The built‑in drier contains a small silica‑gel element that absorbs moisture from the interior of the tube, keeping the sample column dry during prolonged experiments and reducing the need for external drying equipment.

Is this tube compatible with all Randell capillary holders?

Yes, the tube matches the original Randell specifications (model RP CAP022), so it fits all standard Randell capillary tube racks, holders, and analytical instruments without modification.

Can the tube be autoclaved for sterilization?

Absolutely. The borosilicate glass construction tolerates autoclave cycles up to 121 °C, allowing you to sterilize the tube without risking damage or deformation.

Will using this OEM part affect my equipment warranty?

No. Because the part is a genuine Randell OEM component, it is recognized by the manufacturer and does not void the existing warranty on your laboratory equipment.

How do I replace a damaged capillary tube?

Simply remove the old tube from its holder, insert the new Randell Cap Tube .044 X 144 mm, and ensure the drier is positioned correctly at the base. No additional tools or adjustments are required.