PROGLASS Ground Joint Stirrer Bearing Adapter PTFE Stopper (19/22)

Description

Product Overview

The PROGLASS Ground Joint Stirrer Bearing Adapter with PTFE Stopper (model 19/22) is a precision‑engineered component designed to connect laboratory stirrers to ground‑joint glassware with confidence and stability. Its compact form factor fits seamlessly into standard 19 mm or 22 mm ground‑joint ports, allowing researchers to maintain a secure mechanical link while minimizing dead volume. By providing a reliable bearing surface, the adapter ensures that magnetic or mechanical stirrers rotate smoothly, reducing vibration and extending the lifespan of both the stirrer motor and the glassware. Compatibility with a wide range of laboratory mixers makes it a versatile addition to any scientific workflow.

The bearing surface is fabricated from high‑performance PTFE (polytetrafluoroethylene), a polymer renowned for its ultra‑low friction coefficient and exceptional chemical inertness. PTFE’s non‑stick properties allow the stirrer shaft to glide effortlessly, even when exposed to aggressive solvents, acids, or bases commonly used in analytical chemistry. This resistance to chemical attack prevents degradation of the bearing surface, ensuring consistent performance over many cycles of use. Additionally, PTFE’s temperature tolerance up to 260 °C provides confidence when the adapter is employed in high‑temperature reactions or heating blocks, eliminating the need for frequent replacement.

The adapter’s dimensions are carefully calibrated to meet the ISO 228 standard for ground‑joint connections, guaranteeing a tight seal that prevents leakage during vigorous stirring or heating. The 19/22 designation indicates compatibility with both 19 mm and 22 mm joint sizes, simplifying inventory management for laboratories that operate multiple glassware formats. The integrated PTFE stopper acts as a protective barrier, absorbing minor misalignments and protecting the glass joint from mechanical stress. Installation requires only a simple hand‑tighten, with no additional tools or adhesives, enabling rapid setup and turnaround between experiments.

PROGLASS adheres to stringent quality‑control protocols throughout the manufacturing process, employing precision machining and thorough inspection to detect any surface imperfections or dimensional deviations. Each batch undergoes batch‑level testing for friction performance and chemical resistance, ensuring that every adapter meets the same high standards that have earned PROGLASS a reputation for reliability in research and industrial settings. The product is also packaged in a moisture‑controlled environment to preserve the PTFE’s integrity until it reaches the end user.

In summary, the PROGLASS Ground Joint Stirrer Bearing Adapter with PTFE Stopper delivers a combination of mechanical precision, chemical durability, and user‑friendly installation that addresses the most common challenges faced by laboratory technicians and researchers. Its universal fit, robust PTFE construction, and compliance with industry standards make it a cost‑effective solution for maintaining consistent stirring performance across a broad spectrum of experimental protocols.

Usage

The adapter is ideally suited for use in analytical chemistry labs, where precise temperature control and vigorous stirring are essential for reaction kinetics and solubility studies. Whether employed in a reflux condenser setup, a sealed reaction vessel, or a simple beaker, the PTFE bearing ensures that the stirrer shaft rotates without binding, even when the solution becomes viscous or contains particulate matter. This reliability reduces the risk of sample loss or contamination, supporting reproducible results across multiple runs.

Because PTFE is inert to most organic solvents, acids, and bases, the adapter can be used in environments where aggressive chemicals are present without fear of degradation. Researchers working with strong acids such as hydrochloric or sulfuric acid, or with organic solvents like acetonitrile, methanol, and dimethyl sulfoxide, will find that the bearing surface remains unchanged after repeated exposure. This chemical resilience translates into lower replacement costs and less downtime for cleaning or part swaps.

The adapter’s ability to withstand temperatures up to 260 °C makes it compatible with heating blocks, oil baths, and microwave reactors that operate at elevated temperatures. In high‑temperature syntheses, the PTFE stopper prevents the glass joint from cracking due to thermal expansion mismatches, while the bearing maintains smooth rotation despite the heat. Users can therefore conduct thermally demanding experiments without compromising the integrity of the stirring system.

Laboratory technicians, research scientists, and quality‑control engineers will appreciate the adapter’s plug‑and‑play simplicity, which eliminates the need for specialized tools or extensive training. Its universal fit across 19 mm and 22 mm joints means that a single inventory item can serve multiple instrument platforms, streamlining procurement and reducing storage space. Whether in academic, pharmaceutical, or industrial research settings, the adapter supports a wide range of protocols from small‑scale synthesis to high‑throughput screening.

In bioprocessing and cell‑culture applications, maintaining a gentle yet consistent stirring action is critical to prevent shear‑induced damage to delicate cells. The low‑friction PTFE bearing of this adapter delivers the required smooth motion while the stopper protects the glass joint from accidental impacts. Consequently, the adapter is well‑suited for use in bioreactors, fermenters, and tissue‑culture flasks where precise agitation is essential for optimal growth conditions.

Why Choose Us

PROGLASS has built a reputation over decades for delivering high‑quality laboratory glassware and accessories that meet the rigorous demands of scientific research. The company’s commitment to precision manufacturing, combined with a deep understanding of laboratory workflows, ensures that each product, including the Ground Joint Stirrer Bearing Adapter, is engineered to perform reliably under demanding conditions. Customers benefit from a brand that prioritizes durability, consistency, and compliance with international standards such as ISO 228 and ASTM specifications.

Each adapter undergoes a multi‑stage inspection process that includes dimensional verification, surface roughness measurement, and friction testing under simulated laboratory conditions. Any unit that fails to meet the predefined thresholds is rejected and subjected to root‑cause analysis, reinforcing a culture of continuous improvement. This rigorous quality‑control regimen translates into a product that consistently delivers low friction and long‑term chemical resistance, reducing the frequency of maintenance and replacement for end users.

PROGLASS provides responsive technical support staffed by experienced engineers who can assist with installation guidance, troubleshooting, and compatibility questions. Users can reach the support team via phone, email, or an online ticketing system, ensuring that any issues are addressed promptly. In addition, the company offers a straightforward warranty policy that covers manufacturing defects for a period of twelve months, giving customers confidence in the long‑term reliability of their purchase.

Choosing the PROGLASS adapter also aligns with sustainable laboratory practices. PTFE is a recyclable material when processed correctly, and the adapter’s long service life reduces waste generated by frequent part replacements. Moreover, PROGLASS adheres to environmentally responsible manufacturing protocols, minimizing energy consumption and emissions throughout the production cycle. By selecting this product, laboratories can contribute to greener research initiatives without compromising performance.

PROGLASS operates a global distribution network that ensures rapid delivery to research institutions, pharmaceutical manufacturers, and industrial laboratories across North America, Europe, and Asia. All shipments are handled with protective packaging to prevent damage during transit, and the company provides tracking information so customers can monitor order status in real time. This worldwide reach, combined with localized technical support teams, enables users to receive prompt assistance regardless of geographic location.

Key Features

• Low‑friction PTFE bearing ensures smooth rotation, reducing motor wear, minimizing energy consumption, and extending the overall lifespan of both the stirrer and associated glassware, and helps maintain consistent stirring speed across a range of viscosities.
• Chemical‑resistant PTFE construction tolerates aggressive solvents, acids, and bases, maintaining performance after repeated exposure and eliminating the need for frequent part replacement, and provides stable performance even under temperature fluctuations.
• Universal 19 mm/22 mm ground‑joint compatibility simplifies inventory, allowing a single adapter to serve multiple instrument platforms and reduce storage requirements, and ensures a leak‑free seal during high‑speed stirring.
• Easy hand‑tighten installation requires no tools or adhesives, enabling quick setup, rapid turnaround between experiments, and minimal downtime for laboratory personnel, making it ideal for fast‑paced laboratory environments.
• PROGLASS after‑sales support provides technical assistance, a 12‑month warranty covering manufacturing defects, and responsive customer service, ensuring reliable service and peace of mind for users, and quick resolution of any issues that may arise.

FAQ

What ground‑joint sizes does this adapter fit?

The adapter is engineered to accommodate both 19 mm and 22 mm ground‑joint sizes, which are the most common standards used in laboratory glassware. This dual‑size capability means that a single inventory item can be employed across a variety of flasks, condensers, and reactors without the need for separate adapters. The internal bore is precisely machined to a tolerance of ±0.02 mm, ensuring a snug fit that prevents leakage while allowing smooth rotation. Users simply align the adapter with the joint and hand‑tighten it until it is firmly seated. Because the design conforms to ISO 228 specifications, it is compatible with virtually all standard ground‑joint components found in modern laboratory setups.

Can the PTFE stopper be replaced if worn?

The PTFE stopper integrated into the adapter is designed as a permanent component, and under normal laboratory conditions it exhibits a service life that far exceeds typical usage cycles. PTFE’s exceptional wear resistance means that the stopper rarely requires replacement. However, if a user observes visible damage, such as cracks or deformation, the entire adapter should be replaced to maintain the integrity of the sealing surface. Because the adapter is cost‑effective and readily available, swapping the whole unit is more practical than attempting to replace the stopper alone. PROGLASS does not offer a separate stopper part, ensuring that each replacement adapter provides a fresh, pristine PTFE surface.

Is the adapter compatible with magnetic stirrers?

Yes, the adapter is fully compatible with both magnetic and mechanical stirrers commonly used in laboratory environments. The PTFE bearing provides a low‑friction interface that allows the magnetic coupling to transmit torque efficiently, even at higher stirring speeds. For magnetic stirrers, the adapter’s smooth surface reduces the risk of slippage, ensuring consistent agitation of the solution. When used with mechanical stirrers, the bearing supports the shaft’s rotation while the PTFE stopper protects the glass joint from mechanical stress. This versatility makes the adapter a reliable component for a wide range of stirring technologies without the need for additional modifications.

How should I clean and maintain the adapter after use?

After each experiment, the adapter should be rinsed with de‑ionized water to remove any residual chemicals or particulates. For stubborn residues, a mild detergent solution can be used, followed by thorough rinsing with distilled water to avoid leaving any soap film. Once cleaned, the adapter should be dried with a lint‑free cloth or placed in a low‑temperature oven (no higher than 80 °C) to ensure complete moisture removal. Store the adapter in a clean, dry container, preferably with a desiccant packet, to protect the PTFE surface from humidity and dust. Regular visual inspection before each use helps detect any wear or damage early.

What is the warranty policy and how do I claim it?

PROGLASS offers a twelve‑month limited warranty that covers any manufacturing defects in the adapter, including material flaws or workmanship issues. To initiate a warranty claim, the customer should contact the PROGLASS technical support team with the original order number, a description of the problem, and, if possible, photographs of the defective part. The support representative will guide the user through the return process, which typically involves shipping the item back to the designated service center at the company’s expense. Upon verification of the defect, PROGLASS will provide a replacement adapter or issue a credit, ensuring minimal disruption to the laboratory workflow.

Can this adapter be used in high‑pressure applications?

The adapter is primarily intended for standard atmospheric‑pressure stirring setups; however, its robust PTFE bearing and stainless‑steel housing can tolerate modest pressure increases up to 1 bar above ambient without compromising the seal. For applications requiring higher pressures, such as sealed reactors or autoclave processes, it is recommended to use a dedicated high‑pressure joint component specifically designed for those conditions. Attempting to exceed the rated pressure may lead to joint leakage or damage to the PTFE stopper. Always consult the equipment manufacturer’s guidelines when integrating the adapter into pressurized systems.

Technical Specifications

The following specifications summarize the key technical parameters of the adapter, providing quick reference for engineers and laboratory staff when selecting components for their mixing setups.

• Material: PTFE bearing, stainless steel housing
• Joint size: 19 mm / 22 mm ground joint
• Temperature range: -200 °C to 260 °C
• Friction coefficient: ≤0.08
• Compliance: ISO 228, ASTM D6383

These specifications ensure that the adapter meets the demanding performance criteria of modern laboratory mixing equipment while maintaining ease of use and long‑term reliability.

Conclusion

By integrating the PROGLASS Ground Joint Stirrer Bearing Adapter into your laboratory workflow, you gain a reliable, low‑maintenance solution that enhances stirring efficiency while protecting valuable glassware. Its PTFE bearing, universal fit, and rigorous quality assurance make it a smart investment for any research or production environment seeking consistent performance and cost savings.