Plastic Limit Testing Lab Tamil Nadu | Jancy Labs
NABL Accredited Laboratory (Certificate No. TC-12176) as per ISO/IEC 17025:2017
Submitting a soil report without a valid Plastic Limit means your Plasticity Index is incomplete — and your DPR gets returned on day one. Jancy Labs provides accurate plastic limit testing as per IS 2720 Part 5, with NABL-certified reports ready for NHAI, PWD, and PMGSY submissions.
Jancy Labs provides accurate plastic limit testing as per IS 2720 Part 5 — with NABL-certified reports ready for NHAI, PWD, and PMGSY submissions.
Moreover, every test is conducted by a qualified Materials Engineer on calibrated apparatus. Your report carries NABL stamp TC-12176, accepted at every site approval desk. Get your Plastic Limit test done today →
Page Contents — Quick Links
What Is a Plastic Limit (Atterberg Limit) Test?
The Plastic Limit test tells you the minimum moisture content at which your soil can be rolled into a 3 mm thread without crumbling — critical for calculating Plasticity Index and classifying cohesive soils for road and foundation design.
Your soil sample is rolled by hand on a glass plate, and the moisture content at the crumbling point is recorded as the Plastic Limit per IS 2720 Part 5.
However, skip this test and your Plasticity Index calculation is impossible — consequently, your entire soil classification report becomes invalid for DPR submission.
Plasticity Index — Why Plastic Limit Is Non-Negotiable
Plasticity Index (PI) is derived by subtracting the Plastic Limit (PL) from the Liquid Limit (LL). Without a valid PL value, PI cannot be computed — and no highway or building soil classification report is complete without PI.
Applicable Standards
IS 2720 (Part 5): 1985
Methods of Test for Soils — Determination of Liquid and Plastic Limit. IS 2720 Part 5 standardises the thread rolling procedure, moisture content determination, and result reporting — therefore ensuring your Plastic Limit value is consistent and defensible at any approval authority.
Strict Compliance — No Omissions
At Jancy Labs, every Plastic Limit test is conducted strictly as per IS 2720 (Part 5): 1985 — no shortcuts, no omissions. Our accreditation scope and calibration status are verifiable on the NABL India portal → under Certificate TC-12176.
Why the Plastic Limit Test Matters
- NHAI / PWD Road Projects: Plastic Limit is mandatory for computing Plasticity Index — consequently, your subgrade soil classification report cannot be finalised without it.
- PMGSY Rural Roads: Atterberg limits including Plastic Limit are required for all PMGSY soil investigation reports in cohesive soil zones. Furthermore, field engineers verify these values before approving earthwork stages.
- Embankment Design: Plastic Limit defines the lower workability boundary of your fill soil. As a result, earthwork contractors use this value to plan compaction moisture conditioning.
- Foundation Engineering: Structural engineers use Plasticity Index — derived from Liquid Limit minus Plastic Limit — to classify clay soils and design appropriate foundations.
- Soil Stabilisation: Lime stabilisation dosage for black cotton soil depends directly on Plasticity Index. Therefore, an incorrect Plastic Limit value leads to wrong treatment quantities and wasted budget.
- Project Compliance: NHAI and PWD field engineers routinely cross-check Atterberg limit data in NABL-certified reports before clearing construction stage payments.
⚠️ Skipping the Plastic Limit test makes Plasticity Index calculation impossible — and without PI, no highway or building soil report is complete. View all Soil Testing Services →
Why Choose Jancy Labs for Plastic Limit Testing?
When your soil classification depends on Plasticity Index, an inaccurate Plastic Limit value invalidates every downstream calculation in your report.
- Calibrated ground glass plate and standardised rolling rod — dedicated to IS 2720 Part 5 Plastic Limit thread rolling procedure.
- Both Plastic Limit and Liquid Limit conducted together as per IS 2720 (Part 5): 1985 — complete Atterberg limit report available.
- Test reports signed by a qualified Materials Engineer — not a technician.
- NABL accredited laboratory — Certificate TC-12176 | ISO 17025:2017.
- Reports accepted by NHAI, Tamil Nadu PWD, and PMGSY field offices.
- Trusted for Plastic Limit and Atterberg limit testing by highway and infrastructure project engineers across Tamil Nadu.
Furthermore, Jancy Labs has been built on one principle: every result must hold up at a DPR review, site inspection, or client audit. Our NABL accreditation guarantees that. See our NABL accreditation → · Talk to our team today →
How to Get Your Plastic Limit Test Done
Send Your Sample
Courier, transport, or direct delivery with a covering letter. Seal your soil immediately after collection in an airtight container or double zip-lock bag to preserve moisture.
We Test It
Our Materials Engineer performs the thread rolling procedure per IS 2720 Part 5 — a minimum of 3 trials for reliable averaging — then reviews and certifies the result.
You Get Your Certified Report
Receive your NABL-stamped Plastic Limit report by courier or direct collection — ready for NHAI, PWD, and PMGSY submission.
Our Plastic Limit Test Process — as per IS 2720 (Part 5): 1985
- Air-dry the soil sample and pulverise. Sieve through 425 micron IS sieve.
- Mix sieved soil with distilled water. Condition to a moisture level above the expected Plastic Limit.
- Take a small ball of conditioned soil (approximately 8 g). Place it on the ground glass plate.
- Roll the soil ball into a thread using steady hand pressure — target diameter: 3 mm.
- Observe the thread carefully. Continue rolling until the thread crumbles at exactly 3 mm diameter.
- Collect crumbled thread pieces immediately. Determine moisture content as per IS 2720 Part 2.
- Repeat the procedure with fresh soil portions — minimum 3 trials required for reliable averaging.
- Calculate Plastic Limit as the average moisture content (%) at the crumbling point across all trials.
Frequently Asked Questions
How long does a Plastic Limit test take at Jancy Labs?
Can I send soil samples by courier to Jancy Labs for Plastic Limit testing?
Is your Plastic Limit test report accepted by NHAI and PWD?
Can Jancy Labs test Plastic Limit and Liquid Limit together in one submission?
How much soil sample do I need to send for a Plastic Limit test?
Request Your Plastic Limit Test Today
Your Plastic Limit result is the missing piece that completes your Plasticity Index — don't let an incomplete Atterberg report delay your project approval. Submit your sample today and receive a NABL-certified Plastic Limit report that NHAI, PWD, and PMGSY will accept, first time.
| Contact Method | Details |
|---|---|
| 📞 Phone | +91-8680049004 / +91-9994421275 |
| +91-8680049004 | |
| ✉️ Email | jancylabsmdu@gmail.com |
| 📍 Address | No.6, Ganesh Nagar 3rd Street, Surya Nagar, Alagar Kovil Main Road, K.Pudur, Madurai — 625007 |
| 🕐 Hours | Monday to Saturday | 10:00 AM – 6:00 PM |
Request Your Plastic Limit Test
Leave your details and our team will call you back to confirm sample dispatch and turnaround.
Standards & Reference Sources
- Bureau of Indian Standards (BIS) — official publisher of IS 2720 (Part 5): 1985, Methods of Test for Soils: Determination of Liquid and Plastic Limit.
- National Accreditation Board for Testing and Calibration Laboratories (NABL) — verify Jancy Labs' accreditation scope under Certificate TC-12176.
- Indian Roads Congress (IRC) — IRC:37 flexible pavement design guidelines referencing subgrade soil classification and Plasticity Index.
- Ministry of Road Transport & Highways (MoRTH) — Specifications for Road and Bridge Works governing subgrade and embankment acceptance criteria.
- PMGSY — Pradhan Mantri Gram Sadak Yojana — rural road quality control requirements including Atterberg limit parameters.