Reagent bottles are packaging containers used for storing various types of chemical reagents. They may contain a variety of reagents, some of which are flammable, explosive, or prone to oxidation.
Therefore, the selection of containers should vary accordingly. In your daily experiments, do you encounter issues such as poor sealing (volatility, leakage), leaching during long-term storage, poor resistance to high temperatures, or susceptibility to explosion, which can interfere with your experiments?

Blue cap reagent bottles, also known as sampling bottles, sample bottles, mobile phase bottles, sterile bottles, clean bottles, screw-cap reagent bottles, etc., are essential for pollution detection. The quality of these bottles can have various impacts on experiments.

The performance of a blue cap reagent bottle can affect the experiment in the following ways

How to choose the right reagent bottle

Reagent bottles are primarily made of two materials: glass and plastic. The choice of container material depends on the chemical properties of the reagents. Generally, reagents that strongly corrode glass, such as hydrofluoric acid and sodium hydroxide, can dissolve acidic substances, so plastic containers can be selected. Plastic containers are suitable for packaging reagents with a pH range of 5.5-9.0 and are not suitable for packaging strong reducing liquids.

As for glass reagent bottles, they can be divided into high-borosilicate glass and low-borosilicate glass. High-borosilicate glass is more resistant to high temperatures and less prone to breakage at low temperatures, but it is relatively expensive. Low-borosilicate glass reagent bottles have poorer temperature resistance and are relatively cheaper in price.

Good-quality high-borosilicate glass reagent bottles have additional characteristics:

  • Excellent chemical resistance, suitable for storing polar solvents, making them suitable for chromatography and chemical industries. They are also used in industries such as pharmaceuticals that require high-quality solutions without interference from precipitation.
  • Can withstand repeated high-pressure sterilization: They are used in the life sciences and pharmaceutical industries, where reagents such as cell and protein purification-related agents need to be prepared and then subjected to high-pressure sterilization. They have a low coefficient of thermal expansion.

In addition, the craftsmanship of glass reagent bottles is also important. The thickness of the bottle body (thicker is better) and the uniformity of thickness throughout the body are crucial factors in determining whether the reagent bottle is prone to breakage under high or low temperatures.

Apart from selecting the appropriate container material based on the properties of the reagents, the sealing of the bottle is also an important consideration. Poor sealing can lead to the volatilization or leakage of reagents, especially for toxic, flammable, explosive, and corrosive reagents, which can have serious consequences if leakage occurs. To determine if a bottle has good sealing, check if the bottle cap fits well with the bottle mouth, if there is an appropriate gap between them, and if there are any issues with the size of the rubber stopper or the threads on the cap.

Welch’s new blue cap reagent bottles not only possess the excellent characteristics mentioned above but also have the following features:

  • Made of high-borosilicate 3.3 glass material, conforming to USP EP Type I glass.
  • Resistant to chemical corrosion, high temperature, and high pressure (the temperature resistance of the bottle body can reach -150°C to +500°C, and the temperature resistance of the screw cap and anti-tip ring can reach +130°C). Available in various sizes.
  • Polypropylene (PP) outer screw cap with an O-ring anti-drip pouring ring, effectively preventing liquid from flowing onto the outer threads after each pouring, and providing a sealing effect for the glass reagent bottle.
  • Transparent bottle body with scale markings and a white ceramic enamel marking area, ensuring durability.
  • Compliant with ISO GL45 screw cap standards, compatible with ISO R115 and DIN 168 standards.
  • Thick glass bottle body with minimal measurement errors in thickness measurements from multiple locations and angles, ensuring uniformity.
  • The glass bottle body and polypropylene blue cap are made with smooth craftsmanship, showcasing high quality.

Product appearance

Product SKUBrandProduct NameSpecificationSpecification
DH2122DoprahBlue cap reagent bottleBlue PP solid inner thread cap,
100mL GL45
high borosilicate glass control mouth screw cap reagent bottle
1 piece/set
DH2123DoprahBlue cap reagent bottleBlue PP solid inner thread cap,
250mL GL45 
high borosilicate glass control mouth screw cap reagent bottle
1 piece/set
DH2124DoprahBlue cap reagent bottleBlue PP solid inner thread cap,
500mL GL45 
high borosilicate glass control mouth screw cap reagent bottle
1 piece/set
DH2125DoprahBlue cap reagent bottleBlue PP solid inner thread cap,
1000mL GL45 
high borosilicate glass control mouth screw cap reagent bottle
1 piece/set
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