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Efflux Index Apparatus
Efflux Index Apparatus (Product Code: SLE/AG/09) is a funnel-and-hopper flow tester used to measure the flow coefficient of fine aggregates, which gives information on grain shape and angularity, in concrete and highway laboratories. The result is simply the time in seconds for a specified volume of sand to pass a given opening, and the set includes two funnels with different openings. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM science apparatus manufacturer in India, at its own factory in Ambala.
Specifications
| Parameter | Detail |
|---|---|
| Purpose | Flow coefficient (efflux index) of fine aggregates; information on grain shape and angularity |
| Components | Two funnels with different openings, cylindrical hopper, metal stand with a shutter, metal container |
| Result expressed as | Time in seconds for a specified volume of aggregate to flow through a given opening |
| Weight capacity | 5 kg |
| Dimensions | 150 x 180 x 410 mm |
| Product code | SLE/AG/09 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Efflux Index Apparatus Used For?
The apparatus is set up on a level bench with the chosen funnel fitted below the cylindrical hopper and the metal container placed underneath. With the shutter closed, dry fine aggregate is poured into the hopper; the shutter is then opened and a stopwatch started at the same moment, and timing stops when the flow finishes. The time recorded is the flow coefficient, and repeat runs on the same sample should agree closely before a result is reported. Comparing sands from different pits, or natural sand with manufactured sand, shows at a glance which will give a more workable mix.
As low-cost engineering lab equipment in India's concrete technology courses, the test is quick and needs no power, so many samples can be run in one session. Always use completely dry sand, because damp grains clump and give a falsely long time, and wipe the funnels and shutter after each run.
OEM Manufacturer
Jain Scientific Equipments Private Limited, known by its brand ScienceLab, is the OEM (original equipment manufacturer) of the Efflux Index Apparatus. The complete set is made at the company's own licensed factory at Saha, Ambala, Haryana, India, and dispatched factory-direct to concrete laboratories, colleges, dealers and importers. Should a funnel or container need replacing, ask us: spares and repeat orders are dealt with by the manufacturer, not a reseller. The company profile explains who we are and what we make.
Related Civil Engineering Lab Equipment
To prepare and time a fine aggregate sample properly you will also need:
- Stopwatch, Digital — measures to the nearest 1/100th second for timing each flow.
- Oven, 43 litre — dries the sand fully so moisture does not slow the flow.
- Riffle Sample Divider — divides the sand into representative portions for repeat runs.
- Test Sieves — separate the fine fraction before it is tested.
- Sand Absorption Cone And Tamper — another fine aggregate test, used to judge the saturated surface-dry condition of sand.
You can view the complete range in the Civil Engineering Lab Equipment category.
Frequently Asked Questions
What parts make up the Efflux Index Apparatus?
The Efflux Index Apparatus consists of two funnels with different openings, a cylindrical hopper, a metal stand with a shutter and a metal container that receives the sand as it flows out of the funnel.
What does the result from the Efflux Index Apparatus tell me?
The Efflux Index Apparatus gives the flow time in seconds for a set volume of fine aggregate. A longer time points to more angular or rougher grains, and a shorter time to more rounded grains that flow freely.
Why does the Efflux Index Apparatus have two funnels?
The two funnels of the Efflux Index Apparatus have different openings, so the apparatus can be set up as your test method requires for the particular fine aggregate being examined.
Is a stopwatch included with the Efflux Index Apparatus?
A stopwatch is not listed among the parts of the Efflux Index Apparatus. A separate digital stopwatch is recommended for timing each flow, and you can add one to the same enquiry.
How much sand can the Efflux Index Apparatus take, and how big is it?
The Efflux Index Apparatus has a weight capacity of 5 kg and measures 150 x 180 x 410 mm, so it fits easily on a standard laboratory bench beside the balance and stopwatch.
Who manufactures the Efflux Index Apparatus?
The Efflux Index Apparatus is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory at Saha, Ambala, Haryana, India, and supplied factory-direct to laboratories, colleges, dealers and importers.
Can you supply several Efflux Index Apparatus sets for a teaching lab?
Yes. Classroom quantities of the Efflux Index Apparatus are quoted for institutions in India and international markets; include the number of sets and the delivery address, and the quotation comes straight from the manufacturer.
Request a Quote
Send an enquiry for the Efflux Index Apparatus via our contact page, or add it and a stopwatch to the enquiry cart. ScienceLab quotes you directly as the manufacturer.
Last updated: 24 September 2026
