Reliable Fly Ash Supplier & Exporter from China — Class F & Class C, ASTM C618 Compliant
Bulk and bagged fly ash, FGD gypsum and mineral powder for ready-mix concrete, cement plants and infrastructure projects worldwide. Direct group source, batch-tested quality, integrated river–sea logistics from southern China ports.
Why buyers choose SenkSource
- Direct source — long-term offtake with major power plants, year-round supply
- Spec-grade quality — LOI ≤ 5%, batch COA, third-party testing available
- Integrated logistics — 80+ tankers, 40 vessels, 3 wharves, ~50,000 t berths
- Export-ready — full documentation, quote within 24 hours
Green Building Materials for Concrete, Cement & Construction
Four core products, supplied to internationally recognized specifications with a Certificate of Analysis issued for every shipment.
Fly Ash — Class F
Low-calcium, purely pozzolanic fly ash from anthracite/bituminous coal combustion. The most widely traded grade internationally — ideal for durable concrete, cement blending and mass pours.
View SpecificationFly Ash — Class C
Fly ash from sub-bituminous/lignite coal with CaO 15–30%. Offers both pozzolanic and self-cementing properties — for soil stabilization, road base and cementitious applications.
View SpecificationFGD Gypsum
High-purity desulfurization gypsum — a sustainable alternative to natural gypsum for cement retarder, plasterboard production and soil conditioning.
View SpecificationGGBS / Mineral Powder
Ground granulated blast-furnace slag for high-performance and marine concrete — enhanced durability, lower heat of hydration, reduced carbon footprint.
View SpecificationClass F Fly Ash — Typical Values per ASTM C618 / GB/T 1596
| Parameter | Test Standard | Class F |
|---|---|---|
| SiO₂ + Al₂O₃ + Fe₂O₃ (min) | ASTM C618 | ≥ 70% |
| SiO₂ Content (typical) | XRF | 50 – 65% |
| CaO Content (max) | XRF | ≤ 8% |
| Loss on Ignition, LOI (max) | ASTM C618 / EN 196-2 | ≤ 5% |
| SO₃ Content (max) | ASTM C618 | ≤ 1.5% |
| Moisture Content (max) | ASTM C618 | ≤ 1% |
| Fineness — 45 µm sieve (max) | ASTM C618 / GB/T 1596 | ≤ 20% |
| Strength Activity Index, 28d (min) | ASTM C618 | ≥ 80% |
* Typical production values. A batch-specific Certificate of Analysis (COA) is issued with every shipment. GB/T 1596 Category I / II / III values available on request. Typical use: 15–30% cement replacement by weight; up to 40–50% in mass concrete.
Class C Fly Ash — Typical Values
| Parameter | Test Standard | Class C |
|---|---|---|
| SiO₂ + Al₂O₃ + Fe₂O₃ (min) | ASTM C618 | ≥ 50% |
| CaO Content | XRF | 15 – 30% |
| Loss on Ignition, LOI (max) | ASTM C618 | ≤ 5% |
| SO₃ Content (max) | ASTM C618 | ≤ 5% |
| Moisture Content (max) | ASTM C618 | ≤ 1% |
| Fineness — 45 µm sieve (max) | ASTM C618 | ≤ 20% |
| Strength Activity Index, 28d (min) | ASTM C618 | ≥ 80% |
* Typical production values. Typical applications: soil stabilization, road base, low-grade pavement and self-cementing mixes (common in North American specifications).
FGD Gypsum — Indicative Values (confirm with source COA)
| Parameter | Indicative Value |
|---|---|
| CaSO₄·2H₂O | ≥ 90% |
| SO₃ | ≥ 40% |
| Free Moisture | ≤ 10% |
| Fineness (200-mesh residue) | ≤ 5% |
| pH | 6 – 8 |
* Indicative values — batch-specific COA to be confirmed against your source at quotation. Applications: cement retarder, plasterboard, gypsum blocks, agricultural soil amendment.
GGBS / Mineral Powder — Indicative Values
| Parameter | Indicative Value |
|---|---|
| Specific Surface (Blaine) | ≥ 400 m²/kg |
| Activity Index, 7d (min) | ≥ 75% |
| Activity Index, 28d (min) | ≥ 95% |
| Loss on Ignition (max) | ≤ 1% |
| SO₃ (max) | ≤ 4% |
* Indicative values — batch-specific COA to be confirmed at quotation. Applications: high-performance concrete, marine structures, cement blending, precast elements.
Where Our Materials Are Used
From mass concrete pours in the Middle East to precast production in Southeast Asia — fly ash is the workhorse supplementary cementitious material for volume-driven concrete operations worldwide.
Ready-Mix Concrete
Consistent 15–25% cement replacement. Improves workability, reduces heat of hydration and extends pump time.
Precast & Prestressed Concrete
Smoother surface finish, reduced efflorescence, earlier stripping with accelerated curing.
Mass Concrete & Dams
Significantly reduced heat of hydration — critical for large pours, dam structures and raft slabs (replacement up to 40–50%).
Cement Blending & Grinding Plants
Direct bulk supply for PPC / PSC blending — lower clinker factor, lower carbon footprint per tonne of cement.
Road, Paving & Soil Stabilization
Long-term strength gain and enhanced sulfate resistance for roads, runways and pavement slabs.
Bricks, Blocks & Geopolymer
Lower raw-material cost for fly-ash bricks and aerated blocks; feedstock for next-generation geopolymer concrete.
CLSM / Flowable Fill
High fly-ash-content mixes for trench backfill, utility bedding and void-filling applications.
Not sure which grade fits your mix?
Send your application, target standard and dosage range — our team matches the right grade and provides mix-design guidance.
Ask Our TeamFive Reasons Buyers Choose SenkSource
Direct Source, Year-Round Supply
Long-term cooperation with major coal-fired power plants across northern and southern China — a "north-ash-south-supply" procurement network. No off-season, no supply disruption.
Spec-Grade Quality, Batch-Tested
ASTM C618 / GB/T 1596 compliant material with a Certificate of Analysis for every shipment. SGS / BV / CCIC pre-shipment inspection can be arranged.
Integrated Logistics
80+ bulk tanker trucks, 25 river vessels, 15 sea vessels and 3 wharves with ~50,000 t berth capacity. Bulk, container, or bagged — flexible for any project scale.
Export-Ready Documentation
Commercial Invoice, Packing List, B/L, COA, MTC, Certificate of Origin (Form A / E) and MSDS — all handled by our bilingual export team.
Flexible Terms for New Buyers
Trial orders welcome (bagged from 1 MT). 30% T/T + 70% against B/L, L/C and D/P negotiable. Quarterly fixed-price contracts for repeat buyers.
Quote Response
Send your grade, quantity, destination port and packaging — we reply with FOB/CIF pricing and available documents within 24 hours.
Request a QuoteConsistent Quality Is Our First Promise
Every batch is tested against internationally recognized specifications — ASTM C618, GB/T 1596 and EN 450-1 — with a Certificate of Analysis issued per shipment. Third-party inspection (SGS / BV / CCIC) can be arranged before loading.
Tested parameters per batch
- Chemical composition — SiO₂ / Al₂O₃ / Fe₂O₃ / CaO / SO₃ / LOI by XRF
- Physical properties — fineness (45 µm sieve residue), water demand ratio, density
- Strength activity index — 7d / 28d SAI
- Soundness & harmful substances — alkalis, free CaO, chloride (per destination requirements)
- Radiation & environmental indicators where required by importing country
From power plant to your port
- Sampling at source power plant
- Incoming inspection and testing
- Homogenized storage at wharf warehouses (30,000 t capacity)
- Pre-shipment re-testing of the loaded batch
- Batch COA issued with the shipment
- Optional SGS / BV / CCIC third-party inspection
Flexible Packaging, Ports & Payment Terms
An integrated river–sea logistics system moves your material from northern power plants to southern China ports and on to your destination.
Packaging options
- 25 kg PP woven bags, palletized & shrink-wrapped (container stuffing 20' / 40')
- 1,000 / 1,500 kg jumbo bags (FIBC) with PE liner, custom printing available
- Bulk loading into vessel holds (500+ MT per vessel)
- Private-label / custom bagging on request
Loading ports
- Pearl River Delta: Guangzhou, Shenzhen, Nansha, Zhanjiang (adjacent to Foshan production base)
- Northern hub: Tianjin Port (rail-fed from Shanxi & northern procurement bases)
Trade terms & payment
- Incoterms: FOB / CIF / CFR — destination port negotiable
- Payment: 30% T/T deposit, 70% against B/L copy; L/C at sight accepted; D/P for established buyers
- MOQ: 1 MT bagged (trial orders welcome) · 500 MT bulk vessel
- Lead time: 15–25 days after PO confirmation
- Fleet: 80+ tanker trucks · 25 river vessels · 15 sea vessels · 3 wharves (~50,000 t berths) · 30,000 t warehouse
Documentation provided
- Commercial Invoice · Packing List · Bill of Lading
- Certificate of Origin (CO / Form A / Form E)
- Mill Test Certificate (MTC) & COA per shipment
- MSDS · Fumigation certificate (as required) · SGS / BV inspection reports
SenkSource — Your Trusted Fly Ash Export Partner
SenkSource (Shenzhen Mingtuhaichuang Technology and Trade Co., Ltd.) is a member company of a group with more than a decade of operations in China's fly ash distribution industry — a professional exporter of green building materials including fly ash, desulfurization (FGD) gypsum and mineral powder.
Our supply network covers power plants across northern and southern China, supported by an integrated logistics system of 80+ specialized bulk tankers, 25 inland river vessels, 15 sea vessels and 3 wharves with a total berth capacity of about 50,000 tonnes. With a 3-million-tonne (3 Mt) class annual fly ash throughput, the group is one of the largest single fly ash distributors in Guangdong Province, serving batching plants, cement producers and construction material manufacturers across the Pearl River Delta and beyond.
We operate on the principle of "integrity first, customer first" — providing point-to-point vertical supply, stable quality and complete export documentation for buyers worldwide.
Group milestones
- 2012 — Company established with registered capital of RMB 10 million
- 2016 — Acquired the largest fly ash distributor in Foshan; storage +50,000 t; coverage of Foshan / Jiangmen / Zhongshan
- 2019 — Invested RMB 15 million in the Zhaoqing wharf warehouse; storage capacity of 30,000 t
- 2021 — Standing Director Unit of the Asia Fly Ash Association
- 2023 — Named "Outstanding Enterprise in China's Fly Ash Commercial Circulation"; annual throughput reached 3 million tonnes
Supply & cooperation network
- Power plants: Changhai, Nanhai, Hengyi, Zhaoqing Guodian (Pearl River Delta); Dalian Guodian, Dalian Huaneng, Zhuanghe Guodian, Changshu China Resources (northern procurement base)
- Downstream: 2 own batching plants, 21 allied batching plants, 86 customer batching plants; 1 own brick plant, 2 allied cement plants
- Coverage: Pearl River Delta (Foshan, Jiangmen, Zhongshan, Zhanjiang) and Guangxi; inland provinces (Shanxi, Guizhou, Hunan, Jiangxi) via rail-to-sea routing through Tianjin Port
Mission · Vision · Values
- Mission: Help reduce emissions and advance the green mission through resource recycling
- Vision: Lighting up a green future with professional service
Every tonne of fly ash we move is a tonne of industrial by-product converted into green resource — resources born in one cycle and ready for the next. We exist to make that cycle safe, efficient and global.
Frequently Asked Questions
Class F fly ash comes from anthracite or bituminous coal combustion and has a low CaO content (≤ 8%). It is purely pozzolanic — it requires water and calcium hydroxide from cement hydration to react. Class C fly ash (from sub-bituminous/lignite coal, CaO 15–30%) has self-cementing properties in addition to pozzolanic activity. Class F is the most widely traded grade internationally and is preferred for durability-critical applications such as marine structures and sulfate-exposed concrete.
Typically 15–30% replacement by weight of total cementitious material for most structural concrete. Up to 40–50% is used in mass concrete (dams, large foundations) where heat-of-hydration reduction is the priority. Higher replacement slows early strength gain — mix design and curing should be adjusted accordingly, with a superplasticizer generally recommended above 25%.
LOI (Loss on Ignition) measures the unburned carbon content. High LOI causes variability in water demand, air-entrainment performance and color consistency. ASTM C618 sets a maximum of 6% for Class F; our standard specification is ≤ 5%, ensuring consistent performance in admixture-sensitive and architectural concrete.
1 metric ton for bagged orders (25 kg bags or jumbo bags), typically as a full container load. For bulk vessel loading, minimum 500 MT. Trial container orders are accepted for new buyers conducting mix-design qualification.
Yes. Class F fly ash at 20–30% replacement is highly effective at suppressing ASR — the low calcium and high silica content dilutes alkali concentration. This makes Class F a preferred mitigation strategy for projects using alkali-reactive aggregates, particularly roads, dam concrete and long-life infrastructure.
Yes. SGS, BV, CCIC or buyer-appointed inspection can be arranged before loading. Costs are passed through at actuals, and inspection reports are provided with the shipment documents.
Commercial Invoice, Packing List, Bill of Lading, Certificate of Analysis (COA), Mill Test Certificate (MTC), Certificate of Origin (CO / Form A / Form E) and MSDS. Fumigation and third-party inspection reports are provided per destination requirements.
Send us your required grade (Class F / Class C), quantity, destination port, packaging, target standard and expected shipping window — we reply with FOB/CIF pricing and available documents within 24 hours via email or WhatsApp.
Request a Quote or Sample
Tell us the required grade, quantity, destination port, packaging and target shipment date — we respond with FOB/CIF pricing and available documents within 24 hours.
Prefer to chat? Message us directly on WhatsApp with your product, quantity and destination port for a faster response.