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 — 10 day | 5.3 N/mm² | ≥ 4.5 N/mm² IS 3812 | NBML-NN-107004 Aug 2026 |
| Strength activity index — 7 day, % of control | 83.25% | ≥ 75% ASTM C311 | NBML-NN-107004 Aug 2026 |
| Strength activity index — 28 day, % of control | 87.33% | ≥ 80% IS 3812 | NBML-NN-107004 Aug 2026 |
| Moisture content | 0.68% | ≤ 3.0% IS 3812 | NBML-NN-107004 Aug 2026 |
| Water requirement — % of control | 97.25% | ≤ 105% ASTM C618 | NBML-NN-107004 Aug 2026 |
Every parameter above was tested on this lot and meets its requirement. The chemical and physical reports together cover IS 3812 Part 1 and Part 2 in full, and between them every ASTM C618 Class F requirement. Results are lot-specific and are not a guarantee of future lots — a signed test certificate accompanies every tested lot.
| 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 an independent chemistry cross-check against ASTM C311 methods on a separately supplied, unclassified sample; the ASTM C618 Class F position is established by the latest lot above, not by these earlier samples.
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 in full — chemistry, fineness, soundness, lime reactivity and strength activity index.
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All eight physical parameters are reported and each meets its requirement, so this lot is a completed pass on the physical side of IS 3812 Part 1 and Part 2. A signed copy of this report accompanies the lot.
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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. The ASTM C618 Class F position rests on the classified August lot above, where the strength activity index and fineness were measured — 83.25% at 7 days and 30.12% retained on 45 µm.
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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.
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