Pioneer 3 R Refractory Graphite

Independent Screening Certificates

• SHOP-LOT-P3R-001 Pass Tested 04/27/2026
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  Screening Certificate

  Issued by Graphitegrade

  ✅

  Screening Certificate USO-2026-0006 · PASS

  Issued 04/27/2026 · Device USO-PP-007 · Pioneer 3 R Mine - Lab C

  Pass

  Lot Number

  SHOP-LOT-P3R-001

  Product

  Pioneer 3 R Refractory Graphite (Refractory, Coarse (-50 mesh, ≤300 µm), < 85.00 %)

  Source Mine

  Pioneer 3 R

  Lot Status

  Available

  Internal Reference

  P3R-2026-Q2-001

  Origin Country

  —

  Certification Details

  Certificate No.

  USO-2026-0006

  Test Date

  04/27/2026 20:13:15

  Device ID

  USO-PP-007

  Device Validation

  CR2032 ✓ Pre-test

  Location of Test

  Pioneer 3 R Mine - Lab C

  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

  Not Detected

  Carboxyl/Phenol Wave

  High

  Capacitive Current Index

  6.8

  Peak Reversibility

  Irreversible

  Performance Scores

  Electrochemical Homogeneity 4.2/10

  Surface Oxygen Loading 6.9/10

  Defect Density Index 7.1/10

  Peak Reversibility Score 3.0/10

  Classification

  FCE Estimate

  71.0% (predicted)

  Grade Classification

  Refractory Grade

  Reference Standard

  —

  Reject Boundary Ref

  —

  Overall Result

  PASS

  Refractory-grade coarse vein graphite; meets ISO refractory specs.

  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

  Refractory

  Carbon Purity

  82.50%

  ⬛

  Certificate QR Code

  Scan to verify authenticity online
  graphitegrade.com/shop/cert/6