Organic Impurities Test Set Manufacturer,Supplier and Exporter in India
Product Code : EL-CL-8854
Jlab Export is a leading Organic Impurities Test Set Manufacturer,and suppliers in India
Sand with too much organic matter can slow the setting of cement and weaken concrete. This set screens fine aggregate for it by colour. The sand is shaken with a 3% sodium hydroxide solution in a graduated bottle and left for 24 hours. The colour of the liquid is then compared with a five-colour reference chart.
Specifications
| Test | Organic compounds in fine aggregate, by colour comparison |
| Test bottles | Graduated in oz and ml, watertight screw-on caps |
| Reference | Five-colour reference chart |
| Reagent | Sodium hydroxide pellets, enough 3% solution for over 150 tests |
| Supply options | Complete set with or without sodium hydroxide, or single components |
| Standing time | 24 hours |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Reading the Colour Result
After standing, hold the bottle against the reference chart in good daylight and compare the liquid above the sand with the standard colour. If it is lighter than the standard, the sand passes this screening. If it is darker, organic compounds may be present and the sand needs further testing before it goes into concrete.
Sand Quality Practicals for Students
Students collect river sand, pit sand and crushed stone sand and test each one side by side in the graduated bottles. Comparing the colours against the chart shows at a glance which source carries more organic matter.
The same samples can be washed for silt content with the Dunagan Test Set and graded on Test Sieves for a basic sand report. A sand that fails the colour test can be compared with a clean sand by mixing mortar for both in a Cement Mortar Mixer and crushing the cubes.
Frequently Asked Questions
What does a dark colour mean?
A liquid darker than the standard colour means organic compounds may be present in the sand. It does not prove the sand unfit, but it should be tested further, for example by comparing mortar strength with a clean sand.
How many tests does the reagent cover?
The sodium hydroxide pellets make enough 3% solution for over 150 tests. Reagent-grade pellets can also be ordered on their own when the set runs low.
Why is the sample left for 24 hours?
The organic matter needs time to dissolve and colour the solution. Reading too early can make a sand look cleaner than it is, so the bottle stands for the full 24 hours before comparison.
Can I buy the set without the chemical?
Yes. The set comes complete with or without the sodium hydroxide reagent, and single components such as test bottles or the colour chart can be ordered separately.
How should the test be handled safely?
Sodium hydroxide solution is caustic. Wear gloves and eye protection, keep the screw caps tight while shaking, and rinse any splashes off skin with plenty of water.
Other Sand and Aggregate Test Apparatus
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Last updated: 6 November 2026
