By Zhen An International Technical Team
Direct Answer
Black silicon carbide with SiC content of 90%, 88%, 85%, and 75% is a cost-effective industrial abrasive and refractory material widely used in sandblasting, refractory fillers, metallurgical deoxidation, general grinding tools, and anti-skid construction. These low-grade grades provide stable hardness and wear resistance at a much lower cost than high-purity 97%–99% SiC, making them the preferred choice for bulk industrial buyers focused on cost efficiency and heavy-duty performance.
We specialize in low-grade black silicon carbide with 90%, 88%, 85%, 75% SiC grades, providing full grit sizes, factory-direct pricing, bulk supply, and free samples for testing. Contact us today to receive a customized quote within 24 hours.
What Are 90/88/85/75 Grade Black Silicon Carbide?
Black silicon carbide with SiC content of 90%, 88%, 85%, and 75% is a cost-effective industrial abrasive and refractory material widely used in sandblasting, refractory fillers, metallurgical deoxidation, general grinding tools, and anti-skid construction. These low-grade grades provide stable hardness and wear resistance at a much lower cost than high-purity 97%–99% SiC, making them the preferred choice for bulk industrial buyers focused on cost efficiency and heavy-duty performance.
What Properties Do These Low-Grade SiC Grades Have?
Low-grade black silicon carbide refers to products with SiC purity at 90%, 88%, 85%, and 75%, produced for non-precision, high-volume industrial scenarios. Unlike high-purity SiC used in precision polishing or semiconductor fields, these grades retain appropriate impurities to reduce production costs while maintaining basic hardness and heat resistance.
They appear dark black or gray-black crystalline particles, with good toughness and impact resistance. Although their purity is lower, they fully meet the requirements of most heavy industrial applications and are widely recognized in the global market for their high cost-performance ratio.
What Is 90/88/85/75 Black Silicon Carbide Mainly Used For?
Sandblasting & Surface Treatment
This is the largest application for 85% and 88% SiC grades. They are widely used for rust removal, paint stripping, surface roughening of steel structures, and pre-treatment before welding or coating. Their moderate hardness and low cost make them more economical than high-purity SiC for large-scale sandblasting projects.
Refractory Materials & Fillers
75%, 85%, and 88% grades are commonly added to refractory bricks, castables, furnace linings, and kiln furniture. They improve heat conductivity, thermal shock resistance, and overall structural strength while greatly reducing raw material costs for refractory manufacturers.
Metallurgy & Steelmaking Additives
In steel mills and foundries, 75%–90% SiC serves as an effective deoxidizer and metallurgical modifier. It removes oxygen from molten steel, optimizes casting structure, and enhances metal strength, all at a lower cost than high-purity alternatives.
General Grinding & Abrasive Tools
Low-grade SiC is widely used in economical grinding wheels, rough polishing discs, sandpaper, and coated abrasives for cast iron, non-ferrous metals, stone, and glass. It provides sufficient cutting ability for non-precision machining and helps abrasive manufacturers control production costs.
Anti-Skid & Construction Materials
Coarse particles of 75% and 85% SiC are used in road anti-skid layers, wear-resistant floors, and construction surface treatment. They offer high friction and durability, extending the service life of public roads and industrial floors.
How to Choose Between 90, 88, 85, and 75 SiC Grades?
- 90% SiC: Best balance of performance and cost; suitable for general abrasives and refractories
- 88% SiC: Most popular for sandblasting and refractory fillers
- 85% SiC: Ideal for metallurgical additives and high-volume blasting projects
- 75% SiC: Ultra-low-cost option for basic refractory mixes and construction materials
Buyers can select the appropriate grade based on usage, budget, and required performance.
FAQ
Q: What is 90/88/85/75 black silicon carbide used for?
A: It is mainly used for sandblasting, refractory fillers, metallurgical deoxidation, general grinding tools, and anti-skid construction materials.
Q: What is the difference between these low-grade SiC products?
A: Higher SiC content means better hardness and durability; lower grades offer greater cost advantages for bulk use.
Q: Which grade is best for sandblasting?
A: 88% and 85% SiC are the most cost-effective choices for sandblasting and surface treatment.
Q: Can these grades be used for precision polishing?
A: No. They are designed for heavy industry and not suitable for high-precision or high-purity applications.
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.
