Volumetric Flask


A volumetric flask is a type of laboratory glassware designed to measure and prepare precise liquid volumes. Characterized by its pear-shaped body, flat bottom, and elongated narrow neck, it features an etched calibration line indicating the exact volume it can contain when filled to that mark. These flasks are essential for tasks requiring high accuracy, such as preparing standard solutions and conducting precise dilutions.

Key Features:

  • Precision Calibration: Volumetric flasks are calibrated to contain a specific volume at a designated temperature, typically 20°C.

  • Material: They are commonly made from borosilicate glass, known for its durability and resistance to thermal shock.

  • Closure: The flask’s mouth may have a plastic snap or screw cap, or a joint to accommodate a PTFE or glass stopper, ensuring a secure seal.

  • Class Designations: Available in different classes, with Class A flasks offering higher accuracy and often featuring individual serial numbers for traceability

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Volumetric flasks are commonly used in laboratories to accurately prepare fixed volumes of solutions, especially where high-precision solution preparation is required. They are designed so that users can accurately dilute or prepare solutions to a precise volume mark.

 

 Application

Volumetric flasks are mainly used to accurately prepare standard solutions, such as preparing titrants in titration experiments, or preparing standard solutions with known concentrations in analytical chemistry.
Typically, volumetric flasks are not recommended for long-term storage of solutions because their stoppers are not designed to provide a long-term seal like specialized storage bottles. The stopper of a volumetric flask is usually intended to provide a temporary seal during the preparation process, rather than to prevent long-term evaporation or contamination of the solution.
However, in some cases, volumetric flasks can be used as temporary storage containers when no other containers are available or when the solution needs to be used within a shorter period of time. In this usage, it is important to ensure that the stopper maintains a good seal and that the solution does not react with the stopper material.
If you need to store chemical solutions for a long time, it is more recommended to use specially designed storage bottles, such as brown narrow-mouth bottles or screw-top bottles, which usually have better sealing and protection against light, air and temperature changes. We can provide narrow-mouth bottles and wide-mouth bottles in various specifications to meet your experimental needs

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