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Kjeldahl Flask, Borosilicate glass 3.3, with standard ground joint
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For the determination of nitrogen by the Kjeldahl method
Specifications:
| Application | Analytical Chemistry |
| Material | Borosilicate glass |
| Storage Temperature | Ambient |
| Product Type | Laboratory Glassware, flasks |
| Product Brand | Pyrex |
| Product Grade | Analytical grade |
The Pyrex® Kjeldahl Flask made from Borosilicate Glass 3.3 is a high-performance laboratory vessel specifically designed for Kjeldahl nitrogen determination, digestion, and distillation processes. Engineered for durability and precision, this flask features a standard ground glass joint (NS), ensuring secure, leak-free connections with condensers and distillation assemblies.
Its robust construction allows it to withstand high-temperature digestion with concentrated acids, making it ideal for analytical laboratories performing protein and nitrogen analysis in food, environmental, agricultural, and pharmaceutical applications.
Key Features & Benefits
Premium Borosilicate Glass 3.3
- Exceptional resistance to thermal shock and aggressive chemicals
- Suitable for high-temperature acid digestion (e.g., sulfuric acid)
- Long-lasting durability under repeated heating cycles
Optimized Kjeldahl Design
- Long neck and round body designed for efficient digestion and reduced sample loss
- Minimizes splashing during boiling
- Supports uniform heat distribution
Standard Ground Glass Joint (NS)
- Available in 19/26 and 24/29 joint sizes
- Ensures secure, leak-proof connection to condensers and distillation setups
- Compatible with standard laboratory glassware systems
High Clarity Glass
- Allows easy observation of digestion and reaction progress
- Facilitates monitoring of color changes and clarity
Multi-Capacity Range
- Available from 100 mL to 800 mL
- Suitable for both small-scale and routine analytical workflows
Applications
- Kjeldahl Nitrogen Determination
- Protein Analysis in Food & Feed Testing
- Acid Digestion Procedures
- Environmental Sample Analysis
- Agricultural and Soil Testing
- Pharmaceutical Quality Control
Technical Specifications
| Feature | Details |
|---|---|
| Brand | Pyrex® |
| Material | Borosilicate Glass 3.3 |
| Flask Type | Kjeldahl Flask |
| Joint Type | Standard Ground Joint (NS) |
| Joint Sizes | 19/26, 24/29 |
| Chemical Resistance | Excellent (acids, including H₂SO₄) |
| Thermal Resistance | High |
| Transparency | Clear |
| Autoclavable | Yes (where applicable) |
| Compliance | Laboratory glassware standards |
Ordering Information
| Catalog Number | Capacity | Joint Size (NS) | Unit |
|---|---|---|---|
| 8670-100 | 100 mL | 19/26 | Each |
| 8670-300 | 300 mL | 24/29 | Each |
| 8670-500 | 500 mL | 24/29 | Each |
| 8670-800 | 800 mL | 24/29 | Each |
Key Advantages
- Designed specifically for Kjeldahl digestion and nitrogen analysis
- Durable borosilicate glass for high-temperature acid applications
- Secure ground glass joint for reliable system integration
- Available in multiple sizes for flexible laboratory workflows
The Pyrex® Kjeldahl Flask is an essential piece of laboratory glassware for accurate and efficient nitrogen determination. Its robust construction, optimized design, and compatibility with standard distillation systems make it a trusted solution for analytical laboratories across multiple industries.
- Capacity: 100 mL, 19/26 NS 300 mL, 24/29 NS 500 mL, 24/29 NS 800 mL, 24/29 NS