Dean and Stark Apparatus
Product Code : EL-BTLE-10446
Dean and Stark Apparatus (code EL-BTLE-10446) is a borosilicate glass distillation assembly used to separate and measure the water in bitumen and petroleum products. In use, the heated reaction flask sends vapour up to a reflux condenser, and the condensate drips into a graduated trap with a 10 ml receiver read in 0.1 intervals, where water settles below the solvent while the solvent returns to the flask through the sloping side-arm; capacity is 1000 ml.
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Specifications
| Parameter | Detail |
|---|---|
| Use | Separating and collecting the water in bitumen and petroleum products by distillation with a solvent |
| Trap | Vertical cylindrical glass tube with volumetric graduation along its length and a stopcock at the lower end, like a burette |
| Receiver | Graduated, 10 ml, 0.1 intervals |
| Condenser | Reflux condenser, its lower end fitting into the top of the cylinder; cooled by circulating water |
| Side-arm | Sloping side-arm just below the condenser joint, turning sharply downward into a vertical tube connected to the reaction flask |
| Reaction flask | Heated, with boiling chips; uniform wall distribution makes it suitable for heating |
| Separation | Condensed liquids separate in the trap, water below and solvent above; the solvent flows back to the flask when the level reaches the side-arm |
| Draining | When the water reaches the side-arm level the trap is drained into the receiving flask; distillation continues until no more water is produced |
| Capacity | 1000 ml |
| Material | 3.3 borosilicate glass |
| Glass thickness | 0.5-5 mm |
| Colour | Transparent |
| Application | Chemical laboratory |
| Standards | ASTM D95, ASTM D244, EN 1428, IP 74 |
| Product code | EL-BTLE-10446 |
| Manufacturer | Engineering Lab Equipment, Ambala, Haryana, India |
What Is the Dean and Stark Apparatus Used For?
Water in bitumen and petroleum products affects their handling and the results of other tests, so its content is measured by distilling the sample with a solvent that does not mix with water. The sample and solvent are heated in the reaction flask with boiling chips; the water and solvent vapours condense in the reflux condenser and fall into the graduated trap, where the heavier water collects at the bottom and the solvent overflows back down the side-arm. When no more water appears, the volume read on the graduations is the water in the sample. The standards listed are ASTM D95, ASTM D244, EN 1428 and IP 74.
What to Specify When Ordering
- Quantity — the number of apparatus sets required.
Frequently Asked Questions
What is the Dean and Stark Apparatus used for in a bitumen laboratory?
It is used to measure the water held in bitumen and petroleum products, by distilling the sample with a solvent and collecting the water in a graduated trap.
How does the trap separate water from solvent?
Condensed liquid drips into the trap and forms two layers, water below and solvent above; once the level reaches the side-arm, the lighter solvent flows back to the reaction flask while the water stays.
How finely is the receiver graduated?
The apparatus includes a graduated 10 ml receiver marked at 0.1 intervals, from which the volume of water collected during distillation is read.
What glass is it made from?
The apparatus is made of transparent 3.3 borosilicate glass with a thickness of 0.5-5 mm, and the evenly distributed wall of the flask suits it to heating.
What happens when the trap is full?
When the water level reaches the side-arm, the trap is drained into the receiving flask, and distillation carries on until no further water is produced.
Which methods is the apparatus listed for?
The standards listed are ASTM D95, ASTM D244, EN 1428 and IP 74, each of which involves determining water by distillation.
OEM Manufacturer
The Dean and Stark Apparatus is made by Engineering Lab Equipment (Engineering Labs Equipment Pvt Ltd) at its works at Plot No. 43, Industrial Park, Sector 2, Growth Center, Saha, District Ambala, Haryana, India. The company designs, makes and tests bitumen and asphalt testing equipment for binder tests, mix preparation and specimen testing for engineering colleges, polytechnics, technical training institutes and research laboratories in India and overseas, and can build equipment to an institution's own requirements. Tender and OEM enquiries are handled through the Tenders/OEM page.
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See the full Bitumen/Asphalt Testing Lab Equipment range or all Civil Engineering Lab Equipment.
Request a Quote
For this and other bitumen and asphalt testing lab equipment, schools and colleges can contact Engineering Lab Equipment, a manufacturer, supplier and exporter based in Ambala, India. To ask for a quotation, send the number of apparatus sets required and your delivery location through the contact page, or use the Add To Cart enquiry button on this page.
Last updated: October 2026
