Description
Premium COD Vials (Chemical Oxygen Demand Digestion Tubes)
Our Premium COD Vials are laboratory-grade, high-performance digestion tubes engineered specifically for the chemical oxygen demand analysis of wastewater and industrial effluents. Crafted from ultra-pure, chemically inert borosilicate glass, these tubes are built to withstand the extreme thermal stress, high internal pressures, and aggressive acid reagents required during standard dichromate reflux and colorimetric digestion methods.
Key Features & Benefits
1. Thermal-Shock Resistant Borosilicate Construction
Manufactured from premium heavy-wall borosilicate glass, these vials feature an exceptionally low coefficient of thermal expansion. They can withstand rapid temperature shifts up to 150°C to 165°C inside digital block digesters without cracking, shattering, or leaching trace elements into the sample.
2. Leak-Proof, Acid-Resistant Screw Caps
Each vial is equipped with a heavy-duty, high-temperature screw cap integrated with an inert PTFE-faced silicone liner. This premium seal guarantees total chemical resistance against concentrated sulfuric acid and potassium dichromate reagents, preventing sample evaporation, boiling loss, or hazardous acidic vapor leaks during high-pressure heating.
3. Universal Compatibility & Optically Clear Finish
Featuring a standard 16mm outer diameter, these vials are universally compatible with all major brands of COD digester blocks, reactors, and spectrophotometers/colorimeters. The pristine, defect-free glass clarity ensures light beams pass through with zero distortion, yielding highly accurate optical density (OD) reads.
4. Convenient Pre-Printed Graduation & Marking Spot
Designed to streamline high-throughput laboratory workflows, each vial includes a permanent, high-contrast ceramic marking patch and volumetric fill lines. This allows laboratory technicians to quickly label samples and verify reagent volumes at a glance.
Technical Specifications
| Specification | Details |
| Material Composition | Ultra-Pure Borosilicate Glass (Type I, Class A) |
| Cap Material | High-Density Phenolic/Polypropylene with PTFE/Silicone Liner |
| Outer Diameter (OD) | 16 mm (Standard universal laboratory sizing) |
| Total Height | 100 mm (Compatible with deep-well digestion blocks) |
| Volumetric Capacity | 10 mL to 12 mL (Optimized for standard 2.0 mL sample sizes) |
| Max Working Temp | Up to 200°C continuous thermal exposure |
| Chemical Resistance | Complete resistance to concentrated acids, oxidizers, and organic solvents |
Product Packaging & Shipping Configurations
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Packaging Layout: Bulk protective grid tray containing 25, 50, or 100 pieces per box.
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Inner Box Dimensions: Approx. 180 mm x 180 mm x 120 mm (7.0″ x 7.0″ x 4.7″)
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Net Weight (NW): Approx. 0.85 kg (1.8 lbs) per 100-piece pack.
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Gross Weight (GW): Approx. 1.20 kg (2.6 lbs) shipped in a shock-absorbing, multi-layer bubble wrap export carton to guarantee zero breakage during transit.
Ideal Applications
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Environmental Monitoring: Conducting standard EPA-compliant or ISO-compliant chemical oxygen demand (COD) tests on raw and treated water.
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Municipal Wastewater Plants: Preparing batch samples to track organic load reductions in sewage treatment processes.
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Industrial Effluent Auditing: Validating run-off safety margins in textile processing, chemical manufacturing, and food processing plants.
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Academic Research: Equipping university water chemistry and environmental engineering laboratories with reliable testing consumables.
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