Any size could be customized.

Customized logo and customized package are acceptable.

Heat resistant high borosilicate glass test tubes
Well annealed, chemically stable and resistant to thermal stress
Clear and transparent walls ensure optimal visibility
Used in various domestic or imported brand digesters
PTFE liner attached in plastic PP screw cap
Transparent, white and black caps are available
Flat-bottom and round bottom COD digestion tubes are provided
MOQ 5000pcs

COD Digestion test tube:
COD digestion test tubes are specialized glass tubes used in the Chemical Oxygen Demand (COD) testing process to heat water samples in the presence of strong oxidizing agents, typically potassium dichromate, to measure the amount of oxygen consumed by the organic contaminants. These test tubes are designed to withstand high temperatures and corrosive chemicals, providing a safe and stable environment for the oxidation reaction. The tubes are often used with a digestion block or a heating unit, which ensures uniform heating during the digestion process, typically lasting 2 to 3 hours. The tubes are generally made of high-quality borosilicate glass, which is resistant to thermal shock and chemical degradation. Some of these test tubes are equipped with PTFE (Polytetrafluoroethylene) gaskets or caps to ensure a secure, airtight seal during the digestion process, preventing the escape of volatile compounds and ensuring accurate results. They are essential tools in determining the COD value of wastewater and water samples, which helps in assessing water quality and pollution levels.

PTFE gasket:
In the Chemical Oxygen Demand (COD) test, a PTFE (Polytetrafluoroethylene) gasket serves the vital function of creating a secure, airtight seal between the test tube and its cap during the oxidation process. This ensures that volatile substances, such as vapors from the strong oxidizing agents and acidic solutions, do not escape, thus maintaining the integrity of the sample. PTFE's chemical resistance allows it to withstand the corrosive chemicals used in the test, like sulfuric acid and potassium dichromate, while also ensuring that no external contaminants enter the tube. Additionally, the gasket helps contain any pressure buildup during heating, preventing leaks and ensuring both safety and accurate test results.

Meet ASTM E982 specification, Type II requirements

COD Digestion Glass Test Tube

$0.18

To ensure the safe transportation of glass test tubes, we employ a robust packaging system comprising individual PE bubble bag, shrink wrap, foam boards, and cardboard boxes. This multi-layered approach provides excellent protection against potential damage during transit. Our test tubes are uniform bottoms, fire-polished rims, consistent lengths, and convenient packaged in shrink-wrapped inner box. The shrink wrap prevents any external elements or moisture from affecting the test tubes. The foam boards act as shock absorbers, minimizing the risk of breakage by evenly distributing the weight and preventing collisions between the tubes. Finally, the sturdy cardboard boxes offer an additional layer of security during handling and transportation. Individual PE bubble bag and custom partition carton are optional for additional protective packaging measures.
The Chemical Oxygen Demand (COD) test is a widely used analytical method to quantify the amount of oxygen needed to chemically oxidize the organic compounds present in a water sample. The test involves adding a strong oxidizing agent, typically potassium dichromate (K₂Cr₂O₇), to the water sample in an acidic solution, often sulfuric acid, and heating it to accelerate the oxidation of organic pollutants. The organic materials in the sample react with the oxidizing agent, consuming oxygen in the process. After a set period (usually 2–3 hours), the remaining unreacted oxidant is determined through titration or spectrophotometric methods. The difference between the initial and remaining oxidant concentrations is used to calculate the COD value, expressed in milligrams of oxygen per liter (mg/L). A higher COD value indicates a larger concentration of organic matter, which suggests that the water contains substances that can deplete oxygen in aquatic systems, posing a risk to aquatic life. COD testing is crucial for assessing the effectiveness of wastewater treatment plants, monitoring the quality of effluents from industrial processes, and tracking the levels of organic pollution in natural water bodies. It provides a general measure of water pollution but does not specify the exact types of contaminants, making it an important but indirect indicator of environmental impact.

COD Digestion Glass Test Tube

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COD Test