Introduction
When buyers ask for a "standard COA" for FeSi 75% and FeSi 72%, they usually mean one thing: what values should normally appear on a Certificate of Analysis, and what's considered acceptable in trade?
There isn't a single global COA template that fits every country, because standards can vary (GB, ASTM, ISO-related practices, and also buyer-specific specs). Still, most export deals follow a pretty consistent pattern: Si is the headline, and Al/C/P/S are the usual "must-show" items. Below is a practical, commonly used reference.
Products Description
Q1: What does a typical COA for FeSi75 and FeSi72 include?
A COA is basically a batch report. It normally contains:
Product name & grade (FeSi75 / FeSi72)
Batch/Lot number
Test method or lab note (sometimes listed, sometimes not)
Chemical composition results (the key table)
Date and inspector/lab stamp (depends on supplier)
For the chemical table, most buyers expect at least: Si, Al, C, P, S. Some buyers additionally request Mn, Ca, Ti, Cr (often optional unless a special application requires it).
Q2: What are the "common market ranges" shown on COAs for FeSi75?
In many export shipments, FeSi75 is reported with a silicon range like:
Si: ≥ 75% (or commonly 74–76% in practice)
Then you'll see impurity limits. Typical "standard" trade expectations are often around:
Al: ≤ 2.0% (often lower if requested)
C: ≤ 0.2% (some markets accept higher, but many prefer low C)
P: ≤ 0.04%
S: ≤ 0.02%
You'll notice something: buyers rarely care if Si is 75.1 or 75.4. What they do care about is whether Al/P/S swing wildly from lot to lot.
Q3: What are the "common market ranges" shown on COAs for FeSi72?
FeSi72 COAs often show:
Si: ≥ 72% (often 72–73% on the report)
Impurity items are similar, but sometimes the accepted tolerance is slightly wider depending on the deal:
Al: ≤ 2.0% (or buyer-specified)
C: ≤ 0.2%
P: ≤ 0.04%
S: ≤ 0.02%
In reality, a lot of buyers accept FeSi72 because it's economical. But if they are producing cleaner steel, they may still demand the same low P/S targets as FeSi75.
Q4: If there isn't one "global standard," how should buyers request a COA clearly?
A good approach is to request the COA as a format + limits package. For example:
"Please show Si, Al, C, P, S on every COA"
"Si must be ≥75% (or ≥72%)"
"P ≤0.04%, S ≤0.02%"
"Confirm Al limit (1.5% or 2.0%) based on our process"
If you want to be extra safe, ask for 2–3 recent COAs from the supplier. One COA can look nice; consistency across multiple lots is what tells the truth.
Q5: What extra items might appear on a COA for stricter applications?
For higher-end uses (clean steel, certain alloy steels, sometimes electrical steel processes), buyers may add:
Lower Al (like ≤1.0% or even tighter)
Trace elements (Ti, Ca, Mn)
Size distribution note (especially if buying 1–5mm or 0–3mm)
Moisture/packing notes (mainly for fine sizes)
Those aren't always "standard," but they are common upgrades in serious long-term supply contracts.
About Our Products
We supply FeSi75 and FeSi72 with stable composition and regular COA support for export shipments. If you tell us your application (steelmaking, foundry, or more impurity-sensitive production), we can share recent COA samples, discuss suitable impurity limits, and suggest an appropriate size range as well. If you're comparing offers, we can also provide updated FOB pricing from major Chinese ports.
