Sample Certificate of Analysis (COA)
This is a representative COA for our gold-grade coconut shell activated carbon (6×12 mesh, CIP/CIL). Every shipment is tested and accompanied by a COA for that exact lot — tested to GB/T methods in our own QC laboratory.
Test laboratory: YELI in-house QC laboratory, Longyan plant (Fujian).
Sample COA — Gold Recovery Grade Coconut Shell GAC
| Parameter | Result | Test Method |
|---|---|---|
| Iodine adsorption value | 1050 g/kg | GB/T 12496.8-2015 |
| Strength (hardness) | 98.4% | GB/T 12496.6-1999 |
| Moisture (H₂O) | 4.8% | GB/T 12496.4-1999 |
| Particle size 6×12 mesh (1.70–3.35 mm) | 95% min | GB/T 12496.2-1999 |
| Apparent density | 0.51 g/mL | GB/T 12496.1-1999 |
| Ash content | ≤ 5% | GB/T 12496.3 |
| Abrasion resistance | ≥ 98.2% retention, 30 min | ASTM D3802 |
| R-value (2-hour gold adsorption rate) | 52–58% of equilibrium loading in 2 h | GB/T 32992—2016 |
| K-value (equilibrium gold loading capacity) | 8–12 kg Au/t in high-grade circuits | GB/T 32992—2016 |
Note: Values shown are representative of our standard gold-grade spec. The COA shipped with each order reflects that exact batch. Iodine can be tailored from 1000 to 1300 g/kg, hardness up to 98%+, mesh 6×12 / 8×16 / 3×6 mm.
Download the blank COA template (PDF) →
The template shows the format and the full parameter list — including the R-value and K-value gold adsorption indicators (GB/T 32992—2016) — of the batch certificate that ships with every order.
Why an Independent COA Matters
Buyers trust test results because they verify the carbon before it ships — and we encourage re-testing on delivery. A genuine factory has nothing to hide: ask for the COA of your exact lot, send a sample to your own lab, and compare. That is the verification standard we work to.
Request the COA for Your Lot
Every YELI Carbon shipment includes a COA for the exact batch. Tell us your target spec (iodine, hardness, mesh) and we will send a sample plus its COA for your lab to verify.
Request a Sample & COA →