Eisco Borosilicate Glass Filtering Flask 250mL Heavy Wall

Description

Product Overview

The Eisco 250mL filtering flask is a precision laboratory instrument designed for reliable vacuum filtration applications. Constructed from high-quality borosilicate 3.3 glass, it features a heavy wall design that withstands vacuum pressure safely, along with white enamel graduations marked every 50mL for accurate volume measurement. The flask includes a tubulated integral side arm compatible with 3/8″ internal diameter tubing, and its optimized 24.5mm inner diameter neck ensures a secure stopper fit under pressure. With dimensions of 8 x 6 x 6 inches and a weight of 6.4 ounces, this industrial-grade flask is microwavable, autoclavable, and built for long-term durability in demanding settings.

Usage

This filtering flask is ideal for laboratory environments such as research facilities, educational institutions, and industrial quality control labs where precise liquid filtration is essential. It is commonly used in chemistry and biology experiments for separating solids from liquids under vacuum, sample preparation, and solvent recovery. The target audience includes lab technicians, scientists, and students who require dependable glassware that maintains integrity under thermal and mechanical stress, ensuring consistent performance in procedures like Büchner funnel filtration or vacuum distillation.

Why Choose Us

Eisco filtering flasks stand out due to their superior borosilicate glass composition, which provides excellent strength against breakage and superior chemical durability compared to standard glassware. The heavy wall construction is engineered for safe vacuum use, reducing the risk of implosion, while the autoclavable and microwavable properties allow for easy sterilization and heating. With a focus on industrial quality, Eisco ensures each flask meets rigorous standards for precision and reliability, making it a trusted choice for professionals who value safety, longevity, and accurate results in their daily operations.

Key Features

• 250mL capacity with clear white enamel graduations for precise liquid measurement
• Integral side arm adaptable to 3/8″ tubing for seamless vacuum connections
• Heavy wall borosilicate glass design ensures safety under vacuum pressure
• Autoclavable and microwavable construction for easy sterilization and heating
• Optimized neck with 24.5mm inner diameter for secure stopper fit under pressure

FAQ

What is the maximum vacuum pressure this flask can handle?

The heavy wall borosilicate glass construction allows it to safely withstand typical laboratory vacuum pressures, but always refer to the manufacturer’s guidelines for specific limits based on your setup.

Is the flask compatible with standard laboratory stoppers?

Yes, the optimized neck with a 24.5mm inner diameter is designed to fit common stoppers securely, especially under vacuum conditions to prevent leaks.

Can I autoclave this filtering flask repeatedly?

Absolutely, the borosilicate 3.3 glass is autoclavable and can endure multiple sterilization cycles without compromising its structural integrity or clarity.

What applications is this flask best suited for?

It is ideal for vacuum filtration, solvent recovery, and other lab processes requiring durable, heat-resistant glassware with precise volume markings.

Does the flask come with a stopper or tubing?

No, the stopper and tubing are not included, allowing you to select components that match your specific experimental requirements.