Overview
The single-neck flask is a fundamental piece of laboratory glassware, designed for a wide range of chemical processes. Its round bottom allows uniform heat distribution, while the single neck facilitates the attachment of accessories like condensers or adapters. Commonly made from borosilicate glass, it withstands thermal stress and resists chemical corrosion, making it indispensable in research, pharmaceutical, and industrial labs. Available in sizes from 50 mL to several liters, single-neck flasks are often used in conjunction with heating mantles or oil baths. Their simplicity and versatility make them a staple in organic synthesis, quality control, and educational demonstrations.
Physical and Chemical Properties
Borosilicate glass, the primary material for single-neck flasks, offers a low coefficient of thermal expansion, reducing the risk of cracking under temperature fluctuations. Its transparency allows visual monitoring of reactions, while its inertness ensures compatibility with acids, bases, and organic solvents. The round-bottom design enhances mechanical stability during stirring or boiling, and the standardized neck size (e.g., 24/29 joints) ensures interoperability with other lab equipment. The glass’s density (~2.23 g/cm³) and melting point (~820°C) reflect its suitability for high-temperature applications.
Main Applications
Single-neck flasks are widely used in reflux setups, where solvents are boiled and condensed back into the flask to prolong reactions. They also serve as reaction vessels for synthesizing compounds, as their shape minimizes evaporation losses and promotes efficient mixing. In distillation, these flasks hold the liquid mixture being separated, with the neck connecting to a condenser. Smaller flasks are employed for sample storage or preparation, while larger ones accommodate bulk reactions in industrial settings.
Safety and Storage
Always inspect flasks for chips or cracks before use, as defects can lead to breakage under heat or vacuum. Avoid sudden temperature changes, such as placing a hot flask on a cold surface. Use clamps to secure the flask during heating to prevent spills. Store flasks upright in padded racks to prevent rolling and collisions. Keep away from strong alkalis like hydrofluoric acid, which can etch the glass. For long-term storage, ensure the flask is clean and dry to avoid residue buildup.
B2B Procurement Guide
When purchasing single-neck flasks in bulk, prioritize manufacturers with ISO certification to ensure consistent quality. Specify borosilicate glass 3.3 for high thermal resistance. Verify joint sizes (e.g., 14/20, 24/29) to match existing labware. Request samples to check wall thickness and clarity. For specialized applications, consider customizations like reinforced necks or metric threading. Compare lead times and MOQs (Minimum Order Quantities) across suppliers, and inquire about discounts for repeat orders.
Related Manufacturers
- 主营：石英晶圆片、高温高压窗口片、蓝宝石晶圆片、石英烧瓶、圆底烧瓶、石英器皿、密度计、螺旋管、光催化反应器、比色皿、砂芯、投料杯、半导体治具、反应釜、石英坩埚、激光保护镜片、镀膜片、激光腔体、锥形瓶、蒸馏瓶、研磨板、压条、UV镀膜片、烧杯、酶标板
- 主营：实验室边台、通风柜、水质在线监测设备、玻璃单口烧瓶、水质实验室检测仪器、电子天平
- 主营：玻璃蒸馏器、穿孔萃取仪、螺口洗气瓶、聚四氟乙烯烧瓶、四氟水解管、厚壁耐压瓶、气体分析仪、微量滴定管、定氮蒸馏装置、盐酸分离装置、双层玻璃反应釜
- 主营：具挂钩的圆底烧瓶、化学试剂、实验室耗材、实验室设备
- 主营：气相色谱仪、鲁尔接头综合性能测试仪、针管(针)刚/韧性测试仪、单口圆底烧瓶价格、针管流量测试仪、注射器滑动性能测试仪、缝合针切割力测试仪、输液器正/负压泄漏测试仪、输液器流量测试仪、导尿管综合性能测试仪、输尿管支架固定强度测试仪、导管残留真空测试仪、连接牢固度与分离力测试仪、导管正/负压测试仪、导管通畅性测试仪、动力注射件流量与压力测试仪、导丝破裂测试仪、导丝弯曲性能测试仪、鼻氧管综合性能测试仪、呼吸管路气流阻力测试仪、喉罩弯曲性能测试仪、NGI药用撞击器、呼吸模拟器
- 主营：干燥箱、振荡器、水分测试仪、高温电阻炉、数显恒温烘箱、水热合成反应釜
- 主营：棕色单口烧瓶、玻璃量筒、液体装量
- 主营：乳胶丁腈劳保手套、一次性化学防护服、一次性耗材、垒固烧瓶、医用口罩、烧杯
- 主营：玻璃仪器、实验仪器、实验室仪器、蜀牛烧瓶、塑料试剂瓶、广口瓶、试剂瓶、烧杯、高硼硅培养皿、塑料离心管、塑料吸头、塑料培养皿
- 主营：[]
- 主营：污水瓶、李氏瓶、层析柱、移液器、采样瓶、分装瓶、耐压瓶、检测仪、电解池、标口塞、发酵管、容量瓶、过滤器、培养皿、点样管、玻璃带、测定仪、玻璃棒、干燥器、酒精瓶、钢铁炉、止水夹、坩埚钳、冷凝管、洗耳球