Overview
The Erlenmeyer flask, named after German chemist Emil Erlenmeyer, is a conical laboratory vessel with a flat base and narrow neck. Its design minimizes evaporation and splashing during mixing or heating. Commonly made of borosilicate glass (e.g., Pyrex), it withstands thermal stress, though plastic versions exist for single-use applications. Standard sizes range from 50 mL to 5,000 mL, often featuring graduations for approximate volume measurement. The flask’s versatility makes it essential in chemistry, biology, and industrial labs for tasks like titration, culturing, and solvent storage.
Physical and Chemical Properties
Borosilicate glass flasks exhibit high thermal resistance (up to 400°C) and low thermal expansion, reducing breakage risk during heating. They are chemically inert to most acids, bases, and organic solvents. Polypropylene variants resist corrosion but have lower temperature tolerance (~135°C). The tapered neck allows secure stoppering with rubber bungs or foil, while the wide base facilitates magnetic stirring. Graduated markings, if present, are typically accurate within ±5%. Transparency ensures easy observation of reactions or suspensions.
Main Applications
Erlenmeyer flasks are ubiquitous in qualitative and quantitative analysis. In titrations, their shape enables swirling without spillage. Microbiologists use them for aerobic cultures, as the narrow neck supports cotton plugs or vented caps. Industrial applications include small-scale chemical synthesis and solvent storage. Plastic flasks are preferred in fieldwork or biohazard scenarios due to disposability. Their design also suits recrystallization and powder drying processes.
Safety and Storage
Always inspect glass flasks for chips or cracks before use. Avoid direct flame contact; use a heating mantle or water bath. Rapid temperature changes (e.g., adding cold liquid to a hot flask) can cause shattering. Store clean and dry to prevent contamination. For hazardous liquids, use flasks with screw caps or PTFE liners. Label contents clearly, especially for long-term storage. Plastic flasks should be recycled after use to reduce waste.
B2B Procurement Guide
Bulk buyers should prioritize ASTM or ISO-certified suppliers for consistency. Glass flasks from brands like Pyrex or Schott Duran offer proven durability. For cost-sensitive operations, Chinese manufacturers provide competitive pricing but verify lead times and QC standards. Consider autoclave compatibility for life science applications. Customization options include frosted labeling or specialized coatings. MOQs typically start at 100 units, with discounts for 1,000+ orders. Request samples to assess thickness and graduation accuracy.
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