Stopper for Liquid Nitrogen Storage Tank Chang Bioscience 50mm Cap

Description

Product Overview

The Chang Bioscience stopper is engineered specifically for liquid nitrogen (LN2) storage tanks and dewars, delivering a precise 50 mm diameter cap that fits a wide range of standard cryogenic containers. Constructed from high‑grade, chemically inert polymer, the cap resists extreme cold temperatures down to -196 °C without becoming brittle, ensuring long‑term durability. Its loose‑fit design is intentional: it allows for slight expansion of the container neck as the liquid nitrogen vaporizes, thereby preventing dangerous pressure buildup while still providing a secure seal against external contaminants. The stopper is lightweight yet robust, featuring a smooth, rounded edge that minimizes the risk of scratching or damaging the tank mouth during installation or removal. No additional accessories are required; the cap is ready to use out of the box, making it an ideal solution for laboratories, research facilities, and industrial settings where reliable cryogenic storage is essential.

Usage

Designed for versatility, this stopper serves a broad spectrum of applications. In academic laboratories, it is commonly used to seal LN2‑filled Dewar flasks during long‑term experiments, protecting samples from moisture and atmospheric gases. In industrial environments, the cap safeguards large‑volume storage tanks used for cooling processes, ensuring consistent temperature control and safety compliance. The loose‑fit mechanism also makes it suitable for field work where rapid access to the liquid nitrogen source is required; users can quickly remove and replace the cap without the need for specialized tools. Because the stopper does not rely on threaded connections, it is compatible with both new and legacy equipment, reducing the need for costly retrofits. Its straightforward design supports routine cleaning with mild detergents, allowing for easy maintenance in high‑throughput settings.

Why Choose Us

Chang Bioscience has a reputation for delivering high‑quality laboratory components that meet stringent international standards. Each stopper undergoes rigorous testing for thermal shock resistance, chemical compatibility, and mechanical integrity, guaranteeing performance even under the most demanding cryogenic conditions. Our manufacturing process incorporates precision molding techniques that ensure uniform wall thickness and exact dimensional tolerances, resulting in a consistent fit across all units. We also provide comprehensive technical support, offering guidance on proper installation, safety best practices, and troubleshooting. With a focus on sustainability, the polymer material is recyclable and free from hazardous additives, aligning with environmentally responsible laboratory protocols. Choosing our stopper means investing in a product that combines reliability, safety, and ease of use, backed by a responsive customer service team ready to assist with any inquiries.

Key Features

• Exact 50 mm diameter ensures a perfect fit for standard LN2 containers
• Loose‑fit design prevents pressure buildup while maintaining a secure seal
• High‑grade polymer resists extreme cold without cracking or deforming
• Smooth, rounded edge protects tank mouths from scratches during handling
• Responsive customer support and easy replacement policy for peace of mind

FAQ

Can this stopper be used with any liquid nitrogen tank?

The stopper is designed for tanks with a 50 mm (2″) neck diameter, which includes most standard laboratory dewars and many industrial storage vessels. Always verify the tank’s neck size before purchase.

Is the loose‑fit design safe for high‑pressure applications?

Yes. The loose‑fit mechanism is specifically engineered to accommodate the natural expansion of the container as nitrogen vaporizes, reducing internal pressure and enhancing safety.

How should the stopper be cleaned?

Clean with a mild detergent and warm water, then rinse thoroughly. Avoid abrasive cleaners that could damage the polymer surface.

Does the stopper come with a warranty?

All Chang Bioscience products include a one‑year limited warranty covering material defects and manufacturing errors.

Is the stopper compatible with cryogenic gloves?

Yes. The smooth surface and ergonomic shape allow easy handling while wearing standard cryogenic protective gloves.