A Material Test Report (MTR) is more than just a piece of paper; it is the legal guarantee of your material's purity. However, in an industry where the price gap between 99.90% and 99.99% purity is significant, MTR fraud is a real risk.
If you are sourcing C10100 Oxygen-Free Electronic copper, you cannot simply glance at the "Total Copper" percentage. You must audit the specific impurity PPM (parts per million) limits that define "Electronic Grade."
What specific chemical elements prove a report is genuine C10100 (OFE)?
To qualify as C10100 under ASTM B170 Grade 1, the copper must not only be 99.99% pure but also strictly limit specific volatile elements. If these are missing from your MTR, the material is likely standard Oxygen-Free (C10200) or worse.
| Critical Impurity | C10100 (Grade 1) Limit | Why it matters |
| Oxygen (O) | < 5 ppm | Above 10 ppm causes hydrogen embrittlement. |
| Phosphorus (P) | < 3 ppm | Even 10 ppm kills electrical conductivity. |
| Sulfur (S) | < 15 ppm | Prevents "hot shortness" during welding. |
| Zinc (Zn) | < 1 ppm | Prevents outgassing in vacuum chambers. |
| Lead (Pb) | < 5 ppm | Ensures clean machining and ductility. |
If your report shows "Oxygen: 10 ppm," it is not C10100, regardless of what the header says. This is a common trap discussed in our C10100 vs. C11000 price guide, where low-cost suppliers cut corners on refining.
How do you cross-reference ASTM standards on a test report?
A valid MTR must state the specific execution standard. For high-reliability applications like Custom CNC Machined Parts, you should see two specific codes:
ASTM B170: This governs the chemical purity and electrical conductivity (101% IACS).
ASTM F68: This is the "Gold Standard" for electronic use, requiring the material to be free of microscopic cuprous oxide inclusions.
As we noted in our deep dive on ASTM F68 and B170 standards, a report that only mentions "ASTM B152" (general copper plate) is a red flag for electronic-grade procurement.
Submit Your MTR for Expert Verification
Red Flags: What does a suspicious C10100 MTR look like?
Fraudulent reports often share common characteristics. Use this checklist when reviewing batches of C10100 Round, Square & Flat Bar or tubes:
Generic "Typical" Values: If the report lists "Typical Analysis" instead of "Actual Batch Analysis," the supplier is likely using a single report for multiple different melts.
Missing Heat Number: Every batch must have a unique "Heat Number" or "Melt Number" that allows for traceability back to the furnace.
Impossible Conductivity: If the purity is listed as 99.95% but the conductivity is claimed as 101% IACS, the data is physically impossible.
| Feature | Genuine GNEE METAL MTR | Suspicious / Fake MTR |
| Trace Elements | Lists 15-18 specific elements in PPM | Only lists "Cu + Ag" percentage |
| Oxygen Measurement | Specifically tested (e.g., 2 ppm) | Often omitted or listed as "< 10 ppm" |
| Certification | Signed by a certified QC manager | Photocopy with blurry logos/stamps |
| Physical Testing | Includes Grain Size & Hardness (HB/HV) | Only lists chemical data |
Why a third-party SGS report is your final line of defense
For high-value projects, never rely solely on the mill's internal report. At GNEE METAL, we provide secondary verification through SGS or TUV upon request. This involves an independent lab taking a sample of the actual material and running an ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry) analysis.
This level of transparency is essential for industries where a material failure is not an option. Whether you are buying plates or C10100 Seamless Tube & Pipe, insisting on a verified MTR ensures your ROI and protects your equipment from catastrophic failure.
Request a Sample MTR and SGS Lab Report
GNEE METAL Product Range
| Product Type | Shapes Available | Common Grades | Diameter/Thickness Range | Length/Width Range | Applications |
|---|---|---|---|---|---|
| Copper Tubes | Round, Square, Rectangular, Coiled | C10100, C10200, C11000, C12200, C12000 | OD: 0.5mm - 300mm Wall: 0.1mm - 20mm | Up to 6000mm or custom | HVAC, Plumbing, Heat Exchangers, Refrigeration, Hydraulic Lines |
| Copper Plates & Sheets | Flat Sheets, Perforated, Embossed, Tread Plate | C10100, C11000, C12200, C23000, C26000 | Thickness: 0.1mm - 200mm | Width: Up to 2500mm Length: Up to 6000mm | Electrical Busbars, Roofing, Cladding, Gaskets, Transformers |
| Copper Bars & Rods | Round Bar, Square Bar, Hexagonal Bar, Flat Bar | C10100, C11000, C14500, C17200, C18200 | Diameter: 1mm - 300mm | Length: 1000mm - 4000mm | Machined Components, Electrical Contacts, Busbars, Fasteners |
| Copper Wires | Round Wire, Flat Wire, Square Wire, Stranded, Braided | C11000, C11600, C17200, C17510 | Diameter: 0.05mm - 12mm | Coil weights: 1kg - 500kg | Electrical Wiring, Cables, Springs, Mesh, Welding Wire |
| Copper Strips & Coils | Thin Strip, Foil, Slit Coil, Profile Strip | C11000, C12200, C19400, C26000, C26800 | Thickness: 0.03mm - 5mm | Width: 2mm - 1000mm Coil ID: 300mm - 600mm | Transformers, Radiators, Shielding, Terminals, Connectors |
About Our Factory
We operate a full range of production lines including extrusion presses, cold drawing benches, high-speed rolling mills, slitting lines, and precision CNC machining centers, enabling us to produce copper tubes, plates, bars, wires, and strips entirely in-house. For quality assurance, we maintain a dedicated inspection laboratory equipped with spectral analyzers, universal testing machines, hardness testers, surface roughness testers, and optical measuring instruments. Every batch is tested for chemical composition, mechanical properties, and dimensional accuracy before shipment. Our production capacity reaches 500+ tons per month, and we hold ISO 9001:2015 certification with full traceability from raw material to finished product. Whether you need standard mill stock or custom-processed components, we deliver precision copper products with short lead times and complete material certification.
Get Fast Quote & Logistics Plan
