Kjeldahl Flasks
a.Smooth surface
b.Resistant to high temperature
c.Resistant to high pressure
d.Resistant to strong acid(except HF) strong alkali and
e.Material stability
f.Low coefficient of thermal expansion
g.High transparency
Description
Features
- Smooth surface
- Resistant to high temperature
- Resistant to high pressure
- Resistant to strong acid(except HF) strong alkali and
- Material stability
- Low coefficient of thermal expansion
- High transparency
Regular Size
|
Kjeldahl Flasks |
||||
|
Volume/ml |
Outer diameter for neck/mm |
Outer diameter for body/mm |
Full height/mm |
Mini wall thickness/mm |
|
50 |
22 |
51 |
200 |
1.0 |
|
100 |
22 |
60 |
200 |
1.0 |
|
250 |
34 |
81 |
270 |
1.0 |
|
500 |
34 |
101 |
300 |
1.0 |
|
750 |
34 |
115 |
340 |
1.3 |
|
1000 |
34 |
125 |
350 |
1.3 |
Applications
Food Science & Nutrition
Protein content analysis in food products.
01
Agricultural Chemistry
Soil, fertilizer, and crop nitrogen analysis.
02
Environmental Monitoring
Wastewater and pollutant nitrogen testing.
03
Biochemistry & Pharmaceuticals
Protein quantification in biological samples and drugs.
04
Chemical Industry
Nitrogen measurement in organic and inorganic compounds.
05
Properties
|
Physical Properties |
Values |
|
Purity |
＞99.99% |
|
Density |
2.2g/cm3 |
|
Transparency |
＞90% |
|
Mohs Hardness |
5.5--6.5 |
|
Deformation Point |
1280℃ |
|
Softening Point |
1780℃ |
|
Annealing Point |
1250℃ |
|
Specific Heat (20 - 350°C) |
670J/kg.℃ |
|
Thermal Conductivity (20°C) |
1.4W/m.℃ |
|
Heat Conductivity (w/m.k,1000 ℃ ) |
1.0-1.2 |
|
Refractive Index |
1.4585 |
|
Coefficient of Thermal Expansion |
5.510 -7cm/cm.℃ |
|
Hot - working Temperature |
1750--2050℃ |
|
Short - term Service Temperature |
1300℃ |
|
Long - term Service Temperature |
1100℃ |
|
Chemical Properties |
Values |
|
Acid resistant |
Strong Acid(except HF),Strong alkali, organic solution |
|
High temperatures Corrosion resistant |
Excellent |
|
Metal Impurity Content |
＜5 ppm |
|
Electrical Properties |
Values |
|
Resistivity |
7107Ω.cm |
|
Insulation Strength |
250~400Kv/cm |
|
Dielectric Constant |
3.7~3.9 |
|
Dielectric Absorption Coefficient |
＜410-4 |
|
Dielectric Loss Coefficient |
＜110-4 |
|
Mechanical Properties |
Values |
|
Compressive Strength |
1100MPa |
|
Bending Strength |
67MPa |
|
Tensile Strength |
48MPa |
|
Poisson's Ratio |
0.14~0.17 |
|
Young's Modulus |
72000MPa |
|
Shear Modulus |
31000MPa |
Shipping
FAQ
Q1: What is the maximum temperature a quartz Kjeldahl flask can withstand?
A: Up to 1,200°C, but prolonged use above 1,000°C may reduce lifespan.
Q2: Can it be used with hydrofluoric acid (HF)?
A: No, HF dissolves quartz. Use PTFE or platinum containers for HF digestion.
Q3: Why choose quartz over borosilicate glass?
A: Quartz has higher thermal shock resistance, better chemical durability, and higher purity.
Q4: What sizes are available?
A: Common sizes: 50mL, 100mL, 250mL, 500mL, 1000mL (custom sizes available upon request).
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