20/25ML Glass Stoppered Test Tubes Graduated Glass Test Tubes Round-bottomed Stoppered Graduated Test Tubes Frosted-mouth

Key Features

Precise Graduation‌: Available in 20ml and 25ml capacities, with clear graduated scales calibrated at 20℃. The 20ml tube has 0.4ml increments, while the 25ml tube has 0.5ml increments as well, allowing for accurate measurement and control of liquid volume, with a tolerance of ±0.5ml. ​‌Superior Material‌: Made of high borosilicate glass, it has excellent thermal stability and chemical corrosion resistance, capable of withstanding high-temperature sterilization and reacting with most laboratory reagents. ​‌Ground Glass Stopper‌: The ground glass stopper ensures a tight seal, effectively preventing liquid evaporation, contamination, and spillage, suitable for long-term storage of samples and reactions requiring a sealed environment. ​‌Round Bottom Design‌: The round bottom enhances the stability of the test tube when placed on a test tube rack, and is more resistant to breakage than flat-bottom test tubes, especially during heating operations.

Wide Application

Widely used in laboratories of chemistry, biology, medicine, environmental protection and other fields, it is suitable for operations such as liquid measurement, sample storage, small-scale reactions, and qualitative analysis.

Usage Instructions

Place the test tube on a test tube rack, and use a pipette or burette to add the liquid to be tested to the corresponding graduation line. ​When a sealed environment is required, match the ground glass stopper and rotate it to ensure a tight seal. ​After use, clean the test tube with distilled water or the corresponding solvent, and store it in a dry and clean place.

Precautions

Avoid sudden temperature changes to prevent the glass from cracking. ​Do not use in strong corrosive environments that can corrode the glass. ​When opening or closing the stopper, rotate it gently to avoid damaging the ground glass surface. ​Do not place the test tube on a hot surface without a test tube holder to prevent breakage. ​If you have any questions about the product, please feel free to contact us. We will provide you with professional answers and services.