Choosing between silicon carbide 88 (SiC 88) and silicon carbide 90 (SiC 90) is a common challenge for steel plants, foundries, and refractory manufacturers.
While both grades are widely used in metallurgical applications, the difference in purity directly affects performance, stability, and cost efficiency. In practice, the right choice depends not on which grade is "better," but on your specific production requirements.
What Is the Difference Between SiC 88 and SiC 90
The main difference lies in SiC content and impurity levels.
- SiC 88: around 88% silicon carbide, higher impurities, lower cost
- SiC 90: around 90% silicon carbide, lower impurities, better stability
Even a small difference in purity can significantly impact reaction behavior in high-temperature processes.
For a more detailed breakdown of composition and specifications, you can refer to our guide on silicon carbide grades and properties, which explains how different SiC levels influence industrial performance.
Why Purity Matters in Real Applications
In industrial environments, purity is not just a number-it directly affects process stability.
In our experience working with metallurgical applications:
- Higher impurity content may lead to unstable carbon recovery
- Increased slag formation is often linked to lower-grade material
- Reaction efficiency becomes less predictable
This is why some manufacturers switch from SiC 88 to SiC 90 when consistency becomes a priority, especially in more demanding production conditions.
Typical Applications of SiC 88 vs SiC 90
SiC 88 Applications
SiC 88 is widely used in:
- large-scale steelmaking
- cost-sensitive foundry operations
- general metallurgical applications
Its main advantage is cost efficiency, making it suitable for bulk production where slight variations are acceptable.
In foundry environments, SiC 88 is often used as a deoxidizer and carbon additive, especially when balancing performance and cost is important. If you're focusing specifically on casting applications, it's helpful to understand how this grade performs in real foundry conditions and typical usage scenarios.
SiC 90 Applications
SiC 90 is preferred in:
- high-quality steel production
- precision casting
- refractory applications requiring stability
Because of its lower impurity content, SiC 90 provides:
- more consistent reaction performance
- better control over chemical composition
- reduced process variability
In practice, many plants upgrade to SiC 90 when they face quality issues with lower grades.
SiC 88 vs SiC 90: Practical Comparison
| Factor | SiC 88 | SiC 90 |
|---|---|---|
| SiC Content | ~88% | ~90% |
| Cost | Lower | Higher |
| Stability | Moderate | Higher |
| Impurity Level | Higher | Lower |
| Typical Use | Bulk production | High-quality applications |
In real production environments:
- SiC 88 is used where cost efficiency is critical
- SiC 90 is used where performance consistency is required
This distinction becomes especially important in industries where small variations can affect final product quality.
Typical Dosage in Metallurgical Applications
In most steelmaking and foundry processes:
- Typical dosage: 1–3 kg per ton in steelmaking
- Typical dosage: 2–5 kg per ton in foundry
However, dosage varies depending on:
- furnace condition
- carbon requirement
- slag composition
In practice, adjusting dosage is often necessary when switching between SiC 88 and SiC 90, as their reaction behavior differs slightly.
Common Problems When Choosing the Wrong Grade
1. Unstable Carbon Recovery
Using lower-grade SiC in high-demand applications can result in inconsistent carbon absorption.
2. Increased Slag Formation
Higher impurity levels can contribute to excessive slag, affecting efficiency.
3. Inconsistent Production Results
Batch-to-batch variation becomes more noticeable when material quality is not stable.
These issues are often not caused by the material itself, but by choosing the wrong grade for the application.
How to Choose Between SiC 88 and SiC 90
Instead of asking "which is better," consider:
Choose SiC 88 if:
your priority is cost efficiency
you operate large-scale production
slight variation is acceptable
Choose SiC 90 if:
you require consistent performance
impurity control is critical
you produce higher-grade materials
In many real-world scenarios, the decision also depends on supplier reliability. Even the same grade can perform differently depending on production consistency and quality control.
If you're evaluating suppliers, it's worth understanding how to assess reliability, quality standards, and long-term consistency before making procurement decisions.
The Role of Supplier Consistency
One factor often overlooked is supplier consistency.
In practice, many production issues are not caused by the grade itself, but by:
- inconsistent chemical composition
- variation in particle size
- unstable batch quality
This is why experienced buyers focus not only on grade selection but also on supplier reliability and long-term consistency.
Practical Recommendation
Based on industry practices:
- Use SiC 88 for cost-effective bulk production
- Use SiC 90 for stable and high-quality applications
Always test samples before switching suppliers
Focus on consistency rather than lowest price
Understanding your application requirements is the key to making the right choice.
Frequently Asked Questions
Q:What is the main difference between SiC 88 and SiC 90?
A:The main difference is purity. SiC 90 has higher silicon carbide content and lower impurity levels, resulting in more stable performance.
Q:Is SiC 90 always better than SiC 88?
A:No. SiC 90 offers better stability, but SiC 88 is more cost-effective and suitable for many applications.
Q:Which grade is better for steelmaking?
A:Both can be used. SiC 88 is common in bulk production, while SiC 90 is preferred for higher consistency.
Q:What is the typical dosage difference?
A:Dosage is similar, but adjustments may be needed based on reaction performance and process conditions.
Q:How do I choose the right grade for my application?
A:Consider your cost requirements, performance expectations, and production conditions.
Looking for reliable silicon carbide supply for your application?
We provide:
- Stable SiC 88 and SiC 90 quality
- Consistent particle size and composition
- Bulk supply with fast delivery
- Full test reports for every batch
👉 Contact us today to request samples and quotations.
ZHEN AN INTERNATIONAL CO.,LIMITED
ZhenAn is an enterprise specializing in Metallurgical & Refractory products , integrating production, processing, sales and importing and exporting business.
We are focused on building a dedicated team of professionals across the globe. At ZhenAn, we are committed to provide complete solutions by delivering the "right quality & quantity" to suite our customer's processes.
Annual production and sales more than 150,000 tons. Our factory covering an area of 30,000 square meters, it has a complete set of modern production equipment, two large production bases including hydro-metallurgy, two key laboratories and a metallurgical materials testing center with dozens of senior researchers.
