Independent laboratory test reports, published whole. Start with the latest lot — August 2026, the chemical and physical halves of NBML report 1070, covering IS 3812 Part 1 and Part 2 between them. Previously tested lots follow, kept separate so no specification is assembled out of the best figure from each.
The numbers buyers check first, each shown with the report number and date it came from. Latest test result on the left of every pair, applicable requirement on the right — the two are never the same claim.
| Parameter | Latest test result | Applicable requirement | Report |
|---|---|---|---|
| SiO₂ + Al₂O₃ + Fe₂O₃ | 93.08% | ≥ 70% IS 3812 P1 | NBML-CHEM-107004 Aug 2026 |
| Silica (SiO₂) | 51.08% | ≥ 35% IS 3812 P1 | NBML-CHEM-107004 Aug 2026 |
| Loss on ignition | 0.74% | ≤ 5.0% IS 3812 P1 | NBML-CHEM-107004 Aug 2026 |
| Sulphur trioxide (SO₃) | 1.83% | ≤ 3.0% IS 3812 P1 | NBML-CHEM-107004 Aug 2026 |
| Magnesium oxide (MgO) | 1.22% | ≤ 5.0% IS 3812 P1 | NBML-CHEM-107004 Aug 2026 |
| Available alkalis | 0.98% | ≤ 1.5% IS 3812 P1 | NBML-CHEM-107004 Aug 2026 |
| Fineness — Blaine air permeability | 382 m²/kg | ≥ 320 m²/kg IS 3812 | NBML-NN-107004 Aug 2026 |
| Retained on 45 µm sieve | 30.12% | ≤ 34% IS 3812 | NBML-NN-107004 Aug 2026 |
| Soundness — autoclave expansion | 0.09% | ≤ 0.8% IS 3812 | NBML-NN-107004 Aug 2026 |
| Lime reactivity | Awaited | ≥ 4.5 N/mm² IS 3812 | NBML-NN-1070under test |
| Compressive strength — 28 day, % of control | Awaited | ≥ 80% IS 3812 | NBML-NN-1070under test |
Latest tested results available — remaining tests pending. Lime reactivity and 28-day compressive strength were still under test when NBML-NN-1070-2026 was issued. Until those figures are released this lot is not presented as a completed pass against IS 3812; we send them with the lot certificate on request.
| Parameter | Test result | Applicable requirement | Report |
|---|---|---|---|
| SiO₂ + Al₂O₃ + Fe₂O₃ | 94.72% | ≥ 50% ASTM C618 | SGS CG26-014360.00113 Jul 2026 |
| Loss on ignition | 0.34% | ≤ 6.0% ASTM C618 | SGS CG26-014360.00113 Jul 2026 |
| Sulphur trioxide (SO₃) | 0.061% | ≤ 5.0% ASTM C618 | SGS CG26-014360.00113 Jul 2026 |
| Moisture content | 0.04% | ≤ 3.0% ASTM C618 | SGS CG26-014360.00113 Jul 2026 |
| Retained on 45 µm sieve — silo C10 | 20.40% | ≤ 34% IS 3812 | NBML-NN-0978-0113 Jul 2026 |
| Retained on 45 µm sieve — silo C04 | 21.00% | ≤ 34% IS 3812 | NBML-NN-0978-0213 Jul 2026 |
Each row is reproduced verbatim from the signed report named beside it, and belongs to that sample alone — these are separate lots and separate samples, and no specification should be assembled by taking the best figure from each. Requirement columns follow IS 3812 (Part 1):2013 for use as pozzolana and (Part 2):2013 for use as admixture. The SGS rows are a partial chemistry cross-check against ASTM C311 methods on a separately supplied, unclassified sample — full ASTM C618 Class F qualification is still in progress and is not claimed here.
The latest lot leads — chemistry to IS 3812 Part 1, physicals to Part 1 & Part 2, both from the same August 2026 lot. Previously tested lots follow below. Click any report to open the original PDF exactly as the laboratory issued it — letterhead, QR verification code, stamp and authorised signature intact. These are test reports on the samples named in them, not a certification of the product.
Both halves of NBML report 1070 — the full chemical analysis and the physical results, drawn from the same lot on the same date, 04 Aug 2026. Between them they cover the requirements of IS 3812 Part 1 and Part 2, except lime reactivity and 28-day compressive strength, which were still under test when the report was issued.
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Latest tested results available — remaining tests pending. Lime reactivity and 28-day compressive strength were still under test when this report was issued, so this lot is not presented as a completed pass against IS 3812. The completed figures are shared with the lot certificate on request.
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As stated on the report, the sample was supplied by us and not drawn by SGS. It is an unclassified dry fly ash sample: at 49.46% passing 45 µm it sits outside the 34%-retained fineness limit, and it is not representative of the classified Grade I material covered by the NBML reports above, which measured 20.40–30.12% retained. This report is a chemistry cross-check only — it does not establish ASTM C618 Class F conformity, which also needs strength activity index and fineness on a classified sample.
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Open PDF
Part of SGS SA — the world's largest inspection, verification and testing group. Chemistry run at their Ambattur, Chennai multi-laboratory against ASTM C311 methods, on a sample supplied by us. A cross-check on chemistry, not a Class F qualification.
A BIS-approved, Government of India certified laboratory at Raipur (ISO 9001:2015, 14001:2015 and 45001:2018). Physical and chemical testing to IS 3812 Parts 1 & 2 and IS 1727, with a QR-verifiable report.
A signed test certificate for the tested lot you receive — not a generic brochure figure — so your QA engineer can match the paperwork to the load.
The reports on this page, supplied as originals with your quotation for tender and pre-qualification submissions.
Need a parameter this page doesn't cover — lime reactivity, 28-day strength, a particular grading? Say so with your enquiry and we'll have it tested.
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