Issued by Graphitegrade

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Screening Certificate USO-2026-0004 · PASS

Issued 04/27/2026 · Device USO-PP-003 · Pioneer 1 B Mine - Lab A

Pass

Lot Number

SHOP-LOT-P1B-001

Product

Pioneer 1 B Vein Graphite (Battery, Ultrafine (≤10 µm), ≥ 99.95 %)

Source Mine

Pioneer 1 B

Lot Status

Available

Internal Reference

P1B-2026-Q2-001

Origin Country

—

Certification Details

Certificate No.

USO-2026-0004

Test Date

04/27/2026 20:13:15

Device ID

USO-PP-003

Device Validation

CR2032 ✓ Pre-test

Location of Test

Pioneer 1 B Mine - Lab A

Lab

USO Independent Screening

Electrolyte

0.5 M H₂SO₄ (aqueous)

Reference Electrode

Ag/AgCl

Counter Electrode

Pt wire

Scan Rate

50.0 mV/s

Diagnostic Signatures

Quinone/HQ Peak

Detected

Carboxyl/Phenol Wave

Low — Acceptable

Capacitive Current Index

1.9

Peak Reversibility

Reversible

Performance Scores

Electrochemical Homogeneity 8.8/10

Surface Oxygen Loading 1.6/10

Defect Density Index 1.8/10

Peak Reversibility Score 9.3/10

Classification

FCE Estimate

93.0% (predicted)

Grade Classification

Battery Grade

Reference Standard

—

Reject Boundary Ref

—

Overall Result

PASS

Strong quinone peak, low capacitive current. FCE estimate 93%.

CV Trace

CV TRACE — 0.5M H₂SO₄ | Ag/AgCl ref | 50 mV/s

This lot

Known-good reference

Lot Specifications

Graphite Type

Vein

Material Grade

Battery

Carbon Purity

99.96%

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Certificate QR Code

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