Customer Background
The customer is a large precast concrete manufacturer in Brazil, specializing in railway sleepers and infrastructure concrete products. They serve long-term railway construction projects that require high-strength, durable concrete capable of withstanding heavy loads, vibration, and aggressive environments.
For a two-year railway sleeper supply contract, the customer needed a stable, long-term source of microsilica (silica fume) that strictly complies with ASTM C1240 and local import regulations.
Key requirements included:
- Consistent quality for monthly consumption of 60 MT
- Compatibility with precast railway sleeper concrete
- Reliable logistics to a Brazil port
- Support for letters of credit (L/C) payment terms
Technical Requirements & Challenges
The customer provided a detailed technical specification for microsilica used in concrete, including:
- SiO₂ ≥ 92%
- Moisture content ≤ 1%
- Loss on ignition ≤ 4%
- Pozzolanic activity index ≥ 110%
- Specific surface area ≥ 18 m²/g
- Retained on 325 mesh ≤ 10%
- Compliance with ASTM C1240
- Full quality certification and laboratory test reports
In addition, the customer requested:
- Export HS Code & CAS Code
- Complete Technical Data Sheet (TDS)
- Flexible packaging options (bulk bags and small bags)
- Clear container loading details
These requirements are typical for railway sleeper concrete, where strength consistency and durability are non-negotiable.
Test Order → Commercial Agreement
After technical evaluation, Henan Superior Abrasives proposed:
- Densified silica fume (SiO₂ > 92%)
- Stable gray powder with controlled moisture
- Full ASTM C1240 compliance
- Complete documentation for Chilean import clearance
Logistics Solution
- Packaging: Flexible (1 MT jumbo bags or 20–25 kg small bags)
- Container loading:
- 40HQ container: approx. 26–28 MT
- Port of loading: Tianjin, China
- Delivery: CIF Santos port
To verify performance, the customer placed an initial multi-container test order.
After laboratory testing and trial production of concrete sleepers, the material fully met strength, workability, and durability expectations.
Customer Feedback: Quality Consistency as the Key Advantage
Following several months of use, the customer highlighted one critical factor:
“The most important value is quality consistency from batch to batch.”
The microsilica supplied by Henan Superior Abrasives demonstrated:
- Stable pozzolanic reactivity
- Improved compressive strength
- Enhanced concrete density and durability
- Reliable performance in large-scale precast production
This consistency allowed the customer to confidently schedule monthly procurement aligned with their railway sleeper contract timeline.
Why the Customer Chose Henan Superior Abrasives
This cooperation succeeded because of several core strengths:
Strict Quality Control
- Raw material selection and densification control
- Batch-by-batch testing
- Full traceability and certification
Industry-Specific Experience
- Deep understanding of silica fume for concrete and precast applications
- Proven performance in infrastructure and railway projects
Flexible Packaging & Logistics
- Jumbo bags or small bags (20–25 kg)
- Optimized container loading
- Reliable international shipping support
Professional Export Support
- Complete TDS, COA, HS code, CAS code
- Responsive technical and commercial communication
Long-Term Cooperation Outlook
Today, this project has developed into a stable monthly supply relationship, supporting a multi-year railway sleeper program.
Henan Superior Abrasives continues to supply high-quality densified microsilica with consistent performance, ensuring uninterrupted production for the customer.
Contact Us
If you are looking for ASTM C1240–compliant microsilica for:
- Railway sleepers
- High-performance concrete
- Precast elements
- Infrastructure or marine projects
👉 Contact Henan Superior Abrasives today to receive:
- Technical data sheets & test reports
- Packaging & container loading plans
- Competitive pricing for long-term supply
Reliable quality. Consistent performance. Global supply.
