Fly Ash Supplier — Class F & Class C
Fly ash for concrete, cement blending, mass pours and infrastructure. Confirm the required ASTM C618 class, loss on ignition, fineness and activity before comparing shipment prices.
- Standards
- ASTM C618 / EN 450-1
- Grades
- Class F and Class C options
- MOQ
- FCL recommended; trial quantity by grade
- Packaging
- Jumbo bags, bulk loading or container liner
- Lead time
- 15-25 days after grade confirmation
- Trade terms
- FOB · CIF · CFR
Fly ash classes and low-LOI selection
Class, loss on ignition and fineness should be fixed before price comparison. Per-batch LOI matters because excess unburned carbon can disrupt air entrainment and increase mix variability.
Class F Fly Ash (ASTM C618, low calcium)
SiO2 + Al2O3 + Fe2O3 ≥ 70%, CaO ≤ 8%, LOI ≤ 5%, fineness retained on 45 µm ≤ 20% and strength activity index ≥ 80%. The durability grade for sulfate resistance, ASR mitigation, mass concrete and marine work.
Class C Fly Ash (ASTM C618, high calcium)
SiO2 + Al2O3 + Fe2O3 ≥ 50%, CaO 15–30%, LOI ≤ 5% and SO3 ≤ 5%. A self-cementing option from sub-bituminous or lignite coal where faster setting and higher early strength matter more than maximum sulfate resistance.
| Class | SiO2 + Al2O3 + Fe2O3 | CaO | LOI | Typical selection |
|---|---|---|---|---|
| Class F | ≥ 70% | ≤ 8% | ≤ 5% | Durability, mass concrete and marine work |
| Class C | ≥ 50% | 15–30% | ≤ 5% | Earlier strength and self-cementing behavior |
Where buyers use Fly Ash
Cement blending, concrete, mass concrete and infrastructure projects.
Ready-mix concrete
Improved workability and later-age strength in optimized mixes.
Cement blending
Pozzolanic addition for blended cement production.
Mass concrete
Reduced heat development in foundations and large pours.
Infrastructure
Durability-focused concrete for roads, bridges and utilities.
Packaging, logistics and documents
Confirm the grade, quantity, destination and required document set before comparing delivered prices.
Supply details
- Packaging
- Jumbo bags, bulk loading or container liner
- MOQ
- FCL recommended; trial quantity by grade
- Loading
- FOB Tianjin, Qingdao or Shanghai
- Lead time
- 15-25 days after grade confirmation
- Incoterms
- FOB · CIF · CFR
Quality documents
4 public PDFsSGS report MSRQD2600152-01A covers sample MS3096 and reports water requirement, LOI and fineness against ASTM C618-25a. The COA and TDS are supplier-issued samples.
COA1 file
MSDS1 file
Buyer questions
Do you support third-party inspection?
SGS, BV, CCIC or buyer-appointed inspection can be arranged before loading.
Which fly ash class should I request?
Send application, target standard and dosage range so the export team can match the grade.
What is required for an accurate quote?
Send the grade or application, quantity, destination port, packing preference, governing standard and required documents.
Send the grade, quantity and destination port.
We will confirm price, packing, lead time and available batch documents for Fly Ash.