Vintage 1950s Volumetric Flasks. Laboratory Glassware

made from borosilicate glass for durability and heat resistance.
They feature a narrow neck with a single graduation mark, indicating a specific, highly accurate volume when filled to that line.
mixture of 10 mL and 200 mL capacities

Volumetric flasks are primarily used in analytical chemistry and quality control where precision is paramount.
Preparing Standard Solutions: The most common use is preparing solutions with an exact, known concentration.
Accurate Dilutions: They are used to accurately dilute a stock solution to a specific, required concentration.
Precise Measurement: Their design ensures minimal error in volume measurement, which is critical for experiments like titrations or spectrophotometry.
The small 10 mL size makes them suitable for micro-chemistry applications or when dealing with expensive or limited samples.