Colorimetric Tube with Stoppered

1. Composed of high borosilicate material, it possesses characteristics such as low expansion coefficient, high strength, high hardness, resistance to high temperatures and temperature variations, high light transmittance, and high chemical stability, and is capable of withstanding acid and alkali corrosion.
2. With precise capacity and high-quality standards, it fulfills the usage demands of high-precision scenarios like laboratories.
3. The bottle mouth is ground, with each one meticulously ground by hand in a one-to-one manner. The ground surface is fine and uniform without any residual areas. The edge chamfer is smooth without causing any discomfort when touched, and the sealing property is excellent.
4. Equipped with a ground glass stopper, it demonstrates superior sealing performance and can prevent the evaporation, leakage or external contamination of the solution. It is particularly suitable for storing volatile or light-sensitive solutions.

Precautions:
1. Stoppered colorimetric tubes ought to refrain from being utilized or stored under extreme temperatures. Their operational temperature typically ranges within room temperature (approximately 15°C to 30°C). Excessive heat or cold should be evaded as they may induce thermal expansion and contraction of the glass material, thereby resulting in cracking or deformation.
2. Stoppered colorimetric tubes should shun prolonged exposure to intense light, particularly brown ones, which are primarily employed for storing light-sensitive solutions. During experiments, colorimetric tubes should be positioned in an evenly illuminated environment to preclude direct sunlight or strong light sources from interfering with the colorimetric outcomes.
3. Colorimetric tubes should be kept in a dry and well-ventilated milieu to avert moisture from causing condensation on the tube walls or the proliferation of microorganisms, which could impact light transmissibility and experimental accuracy. They should be distanced from water sources and damp areas during storage.
4. Stoppered colorimetric tubes are fabricated from high borosilicate glass and exhibit commendable chemical stability; however, contact with strong alkalis, hydrofluoric acid, and other highly corrosive substances should still be avoided. Prompt cleaning is necessary after usage to prevent residual chemicals from corroding the tubes.
5. Handle with delicacy: The tube walls of colorimetric tubes are relatively thin and cannot be directly heated. They should be manipulated gently during application to eschew damage.
6. Employ the same specifications: Identical specifications of colorimetric tubes should be utilized in the same colorimetric experiment to guarantee the accuracy of the colorimetric results.
7. Cleaning caveats: Hard-bristled brushes should not be employed to clean colorimetric tubes as they might abrade the tube walls and influence light transmission. Soft-bristled brushes or ultrasonic cleaning is preferred.
8. Consistent colorimetric conditions: During colorimetry, only two colorimetric tubes should be compared at a time, and the lighting conditions should be uniform to minimize errors.