Overview
The Erlenmeyer flask, named after German chemist Emil Erlenmeyer, is a fundamental piece of laboratory equipment. Its design combines a conical body with a flat base and a narrow neck, making it ideal for tasks requiring swirling or heating liquids. The flask's tapered shape minimizes splashing, while the neck allows for easy stoppering or attachment of condensers. Commonly made of borosilicate glass (e.g., Pyrex), it withstands thermal stress and chemical corrosion. Plastic variants exist for single-use applications. Sizes range from 50 mL to 5,000 mL, with volume graduations marked on some models.
Physical and Chemical Properties
Borosilicate glass flasks exhibit high thermal resistance (up to ~400°C) and low thermal expansion, reducing fracture risks during heating. They are inert to most acids, bases, and organic solvents, though hydrofluoric acid and strong alkalis can cause etching. The conical shape promotes turbulent mixing without mechanical stirrers, while the narrow neck slows evaporation. Plastic versions, typically polypropylene or polymethylpentene, are lightweight and shatterproof but lack heat resistance.
Main Applications
Erlenmeyer flasks are ubiquitous in chemistry labs for titrations, recrystallization, and culturing microbes (with baffled designs for aeration). Their stability makes them preferable to beakers for heating liquids under reflux or on hot plates. In industrial settings, they serve small-scale synthesis and quality control testing. Biotechnology uses sterile flasks for cell culture, often with vented caps for gas exchange. The design also suits educational demonstrations due to its spill-resistant profile.
Safety and Storage
When heating, use a gauze pad or ceramic-centered hotplate to distribute heat evenly. Never heat sealed flasks, as pressure buildup may cause explosions. Inspect for cracks or chips before use. Store clean flasks upright in cabinets or on shelves, avoiding overcrowding. Plastic flasks should be kept away from UV light to prevent degradation. For sterile applications, autoclave glass flasks at 121°C or use pre-sterilized disposable units.
B2B Procurement Guide
For bulk purchases, prioritize suppliers with ISO 9001 certification to ensure consistency. Specify material (e.g., ASTM E438 Type I for borosilicate glass), tolerance (±5% for graduated flasks), and certifications like USP for pharmaceutical use. Lead times vary: standard sizes are often stocked, while custom markings or materials may require 4–8 weeks. MOQs typically start at 100–500 units. Compare OEM and distributor pricing; bulk discounts of 10–30% are common for orders exceeding 1,000 units.
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