Description of 1118 Kjeldahl Flask

The 1118 Kjeldahl Flask is a lab-grade borosilicate glass volumetric vessel specially manufactured for the classic Kjeldahl digestion method, widely used in food testing, agricultural labs, environmental monitoring, and biochemistry research. Designed with a round bottom and extra long neck, this lab glassware (model 1118) optimizes heating uniformity during sample digestion and prevents liquid splashing under high-temperature boiling conditions. Unlike ordinary round-bottom flasks, the long narrow neck of the 1118 Kjeldahl flask traps volatile ammonia gas effectively, guaranteeing accurate nitrogen & protein test results.

Specification Of Kjeldahl Flask

All size parameters follow international lab glassware standards, with 6 standard capacities covering small sample micro-tests to large-volume industrial digestion:

Every 1118 Kjeldahl round bottom flask is blown from thick-wall high borosilicate glass, delivering outstanding thermal shock resistance to handle direct flame or heating mantle digestion work. The consistent neck OD ensures tight sealing with standard lab stoppers and distillation apparatus.

Feature of Kjeldahl Flask

● Round Bottom Uniform Heating

The spherical bulb design makes full contact with lab heating equipment, eliminating local overheating during strong acid digestion, reducing glass cracking risk.

● Extended Long Neck Anti-Splash Structure

The 200–350mm tall long neck blocks boiling sample liquid from splashing out, retains ammonia vapor inside the flask, and cuts sample loss during Kjeldahl protein detection.

● Universal Standard Sizing

Standard 22mm & 34mm neck outer diameters match all mainstream Kjeldahl digestion distillation units, compatible with lab rubber stoppers, glass adapters and condensers.

● Multi-Capacity Selection

30ml to 1000ml full range meets micro-sample food testing, agricultural soil analysis, feed protein inspection and industrial wastewater lab projects.

● Chemical Corrosion Resistance

High borosilicate glass resists concentrated sulfuric acid, alkaline digestion reagents and high-temperature chemical reactions, long service life for daily lab use.

Laboratory Application Of Kjeldahl flask

 The 1118 Kjeldahl flask is an essential piece of lab consumable for all facilities running Kjeldahl nitrogen determination:

● Food & beverage testing labs: Protein content testing for dairy, meat, grain products

● Agriculture labs: Nitrogen analysis for soil, fertilizer, animal feed

● Environmental testing stations: Total nitrogen detection of sewage and industrial wastewater

● University chemistry & biochemistry teaching labs

● Pharmaceutical & cosmetic quality control laboratories

 Why Choose Our 1118 Series Kjeldahl Flasks for Your Lab

 Our model 1118 long neck round bottom Kjeldahl flasks are mass-produced under strict lab glassware quality control standards, with each unit inspected for dimensional accuracy, glass thickness and thermal stability:

● Strict compliance with the dimension data shown in the specification chart, interchangeable with global well-known lab glass brands.

● Thickened round bottom structure to extend service life under repeated high-heat digestion cycles.

● Smooth uniform inner & outer glass walls, easy to clean and no sample residue buildup.

● Bulk wholesale support for lab equipment distributors, research institutes and school procurement projects.

● Full capacity stock ready for fast shipment, customized logo & packing service available for global B2B lab supply clients.

Frequently Asked Questions (FAQ)

Q1: What is the main difference between 1118 Kjeldahl flask and common round bottom boiling flask?

 A1: The 1118 Kjeldahl flask features a much longer narrow neck specifically for ammonia retention in nitrogen digestion. Ordinary round-bottom flasks have short necks that cause severe sample splashing and volatile loss during Kjeldahl testing.

Q2: Can the 1118 Kjeldahl flask be heated directly by an alcohol lamp or heating mantle?

 A2: Yes, the high borosilicate round bottom supports direct heating with standard lab heating devices, suitable for high-temperature acid digestion workflows.

Q3: Which capacity of 1118 Kjeldahl flask is most popular for regular food protein testing?

 A3: The 250ml and 500ml 1118 Kjeldahl flasks are the most widely used standard sizes for routine food and feed lab analysis.