Industries
Metal Trading and Recycling
Umpire Assay and Referee Analysis
A disputed assay moves real money. From the BME House office in Mumbai's Gulalwadi market, TCR runs the umpire analysis: fire assay weighed to 0.0001 g resolution, classical wet chemistry, and a certificate carrying ILAC reciprocity.
Request a QuoteIn brief
TCR is the umpire laboratory for India’s bullion, base-metal and ferro-alloy trade: an ICCL/BSE-approved assayer since November 2018, empanelled by NSE Clearing Limited as an independent assayer for base metals since February 2021, and the preferred laboratory partner to the 2,500-plus member traders of Bharat Metal Exchange, settling disputed assays by fire assay, spectrometry and classical wet chemistry under NABL accreditation with ILAC MRA recognition.
Key takeaways
- Disputed bullion, base-metal and ferro-alloy assays are settled by fire assay and chemical analysis on spectrometers and a classical wet-chemistry bench, reported under NABL certificate NABLT0726MH18640.
- TCR has been an ICCL/BSE-approved assayer since November 2018 and an NSE Clearing-empanelled assayer for base metals since February 2021; both letters are published on this page.
- Copper-alloy, aluminium-alloy, nickel-alloy, ferro-alloy and zinc-coating work is reported against ASTM and IS methods; the full standards matrix is below.
Overview
TCR resolves disputed assays, off-specification consignments and contamination claims in the bullion, non-ferrous and ferro-alloy trade, as the neutral arbitration assayer for exchange-settled and physical-market consignments.
- Methods: fire assay, and chemical analysis by optical-emission and ICP spectrometry, atomic absorption and classical wet chemistry.
- Role: independent referee between buyer and seller.
Industry Context
Metal trading runs on assay trust. Every consignment of ferro-alloys, scrap, ingots, or finished product changes hands against a composition certificate, and a disputed assay moves real money between buyer and seller with no room for argument by opinion. The referee in that dispute must be independent, accredited, and fast.
- Exchange pool: the BSE and NSE bullion contracts, the Indian Clearing Corporation Limited settlement workflow, and Bharat Metal Exchange Ltd.
- Jewellery and refining pool: bullion refiners, jewellery houses, hallmarking centres, and gold and silver bar manufacturers.
- Non-precious pool: traders in copper, aluminium, lead, zinc, nickel, tin, brass, bronze and the ferro-alloys (FeV, FeMo, FeNi, FeSi, FeCr), pricing off the LME and Comex and settling physically through Bharat Metal Exchange.
- Differentiators: empanelment with BSE, NSE and ICCL, and the sample collection centre at Bharat Metal Exchange; a full classical wet-chemistry bench retained for arbitration and referee analysis; more than 700 PMI projects; and NABL accreditation to ISO/IEC 17025:2017 (NABLT0726MH18640), which gives every assay report ILAC MRA recognition abroad.
TCR has played that role for decades from its BME House metal market office in Mumbai's Gulalwadi trading district, backed by NABL-accredited spectrometry, classical wet chemistry and LECO analysis, and sampling protocols that stand up in commercial arbitration. For traders, the TCR certificate is not a formality; it is the instrument that settles the trade.
Materials We Inspect
| Material Class | Examples |
|---|---|
| Industrial non-ferrous | Copper (electrolytic, fire-refined), aluminium (alloy and wrought), lead, zinc, nickel, tin |
| Brass and bronze | C260, C272, C360, gunmetal, naval brass, manganese bronze |
| Ferro-alloys | FeV, FeMo, FeNi, FeNiMo, FeSi, FeCr, FeMn, FeTi, FeNb |
| Iron ore and concentrates | Hematite, magnetite, fines, sinter feed, pellet feed |
| Specialty alloys | Inconel scrap, monel scrap, hastelloy scrap; refractory-metal scrap (Ti, Mo, W, Ta, Nb) |
| Galvanised coatings | Radiator fins, sheet G.I., wire G.I. |
| Fasteners (commodity grade) | Screws and spring washers per IS 1573 |
Test Methods We Apply (Assay Vocabulary)
- Fire assay
- Cupellation method for gold and silver bullion; weighing on micro-balance to ±0.0001 g resolution. ASTM E1335 reference frameworks.
- Optical Emission Spectrometry (OES)
- Bulk compositional analysis of metals and alloys to ASTM E415 and E1086.
- Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES)
- Trace element scanning, multi-element capability, to ASTM E1479.
- Atomic Absorption Spectrometry (AAS)
- Trace and minor element quantification.
- Combustion Analysis (LECO)
- Carbon and sulphur in metals; IGA for nitrogen and oxygen; ASTM E1019.
- Classical wet chemistry
- Volumetric, gravimetric and titrimetric methods, including the ASTM E350 to E353 series, for verification, arbitration and reference-standard calibration, retained at full bench scale for arbitration and referee analysis.
- X-Ray Fluorescence (XRF)
- Hand-held and bench-top units for rapid bulk identification at field-level (PMI).
- Density and specific gravity
- Archimedes method for bullion verification.
- Hallmarking-grade testing
- BIS-aligned hallmarking workflow for jewellery centres.
Standards Coverage Matrix
- Non-Ferrous and Specialty
- ASTM E478 (copper alloys); ASTM E607 (aluminium alloys, by spark emission); ASTM E536 (zinc and zinc alloys); ASTM E76 (nickel and nickel alloys); IS 191, IS 21, IS 1944, IS 8492, IS 1366 (Indian non-ferrous specs); SAE/ASTM Unified Numbering System (UNS) per Casti Metals Red Book and Metals Black Book references.
- Ferro-alloys
- IS 1170, IS 1559, IS 4226, IS 4225 series; FeV, FeMo, FeNi compositional standards.
- Coating and Plating
- IS 1573 (electroplated zinc coatings, applied to screws and spring washers); IS 4759 (galvanising); ASTM A123, ASTM A153 (galvanising).
- Reference Materials
- Certified reference materials bought from ARMI (USA) and MBH (UK) for calibration and verification.
Service Applications Across the Assay and Trade Cycle
For metal traders TCR's work follows the trade cycle rather than the life of a plant: pre-shipment sampling, assay, umpire analysis and settlement support, with TCR as the neutral laboratory signature that both sides of a trade can accept.
The recurring problems are sampling integrity on heterogeneous scrap and ferroalloy lots, assay disputes between buyer and seller certificates, and the settlement risk that follows, which is why the BSE and NSE empanelment and the bullion fire-assay operation anchor this work.
- Pre-Shipment Sampling
- Representative sampling of scrap, ferroalloy, ingot, and concentrate lots at yards, ports, and warehouses, with sample splitting and chain-of-custody discipline, supported by the TCR-BME Metal Market office serving the Mumbai ferroalloy catchment.
- Assay and Analysis
- Chemical analysis by classical wet chemistry, optical emission spectrometry and X-ray fluorescence across ferrous, non-ferrous and precious metals, including bullion fire assay, under NABL certificate NABLT0726MH18640.
- Umpire and Dispute Analysis
- Where buyer and seller certificates diverge, TCR acts as the umpire laboratory, retesting retained splits under agreed protocols and issuing the neutral certificate that settles the trade.
- Settlement and Exchange Support
- Assay certification supporting exchange-linked settlement, including the BSE and NSE empanelment scope, and periodic verification programmes for recurring trade counterparties.
Named Clients
- Statutory
- Bombay Stock Exchange (BSE), National Stock Exchange (NSE), Indian Clearing Corporation Limited (ICCL; ICCL/BSE Approved Assayer since November 2018), Bharat Metal Exchange Ltd (BME, formerly Bombay Metal Exchange Ltd), Chamber of Commerce.
- Industrial non-ferrous traders
- BME House catchment of approximately 2,500+ traders; ferro-alloy traders supplying steel and foundry buyers; copper and aluminium traders supplying construction, automotive, and electrical buyers.
Congratulations from the metal trade
TCR Engineering completed fifty years in 2023. Five organisations in the metal and fastener trade wrote to mark it, across four documents: HEM Industries, the Indian Clearing Corporation Limited, J. J. Industries, Metal Gems and Mehta Tubes Limited. All are published here in full.
Documents
Download the reference documents for this page. Every file is hosted on this domain and is also listed in the site document library.
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Approved Assayer for ICCL / BSE
TCR will perform the functions of assaying / testing commodities in accordance with the ICCL/BSE norm
Frequently asked questions
Is TCR an approved assayer for Indian exchanges?
Yes. TCR has been an ICCL/BSE Approved Assayer since November 2018, serves the BSE and NSE bullion contract workflow, has been empanelled by NSE Clearing Limited as an independent assayer for base metals since February 2021, and operates the BME House physical assay operation in Mumbai's Gulalwadi trading district.
How does TCR assay gold and silver bullion?
Bullion runs by fire assay using the cupellation method, weighed on a micro-balance to ±0.0001 g resolution against ASTM E1335 reference frameworks, supported by density verification by the Archimedes method and a BIS-aligned hallmarking workflow for jewellery centres.
What happens when buyer and seller assay certificates diverge?
TCR acts as the umpire laboratory. Retained splits are retested under agreed protocols with sample splitting and chain-of-custody discipline, and the neutral certificate that results settles the trade, backed by NABL NABLT0726MH18640 accreditation and ILAC MRA reciprocity that both sides can accept.
Which analysis methods back the assay certificate?
Optical emission spectrometry per ASTM E415 and E1086, wet chemical analysis per the ASTM E350 to E353 series, ICP-OES trace scanning, atomic absorption spectrometry, LECO combustion analysis for carbon and sulphur, X-ray fluorescence for rapid identification, and a full classical wet-chemistry bench retained for arbitration and referee analysis.
Can TCR sample consignments before shipment?
Yes. Representative sampling of scrap, ferroalloy, ingot and concentrate lots runs at yards, ports and warehouses with sample splitting and chain-of-custody discipline, supported by the TCR-BME Metal Market office serving the Mumbai ferroalloy catchment of approximately 2,500-plus traders.