Benchmark Abrasives 4-1/2" silicon carbide resin fiber discs deliver fast cutting action and a consistent scratch pattern on non-ferrous metals, masonry, stone, glass, fiberglass, plastics, hard rubber, and selected wood applications. Silicon carbide is an extremely hard, sharp, and highly friable abrasive grain that fractures readily during use to expose fresh cutting edges, making it especially effective on hard, brittle materials and surfaces where conventional metal-grinding abrasives are not the best choice.
Each disc uses silicon carbide abrasive electrostatically bonded to a heavy-duty vulcanized fiber backing with heat-resistant phenolic resin. The rigid fiber backing provides strong support under grinding pressure and helps transfer power efficiently to the workpiece for controlled stock removal. Available from aggressive 16 grit through finer 120 grit, these discs can handle heavy material removal, shaping, deburring, blending, and surface preparation across a wide range of non-ferrous and non-metal applications.
These discs are designed for use on right-angle grinders with a compatible 4-1/2" backing pad. A backing pad is required and sold separately.
Quantity: 25 Discs
Dimensions & Specifications
Specification
Details
Disc Diameter
4-1/2"
Arbor / Center Hole
7/8"
Abrasive Grain
Silicon Carbide
Backing
Vulcanized Fiber
Available Grits
16, 24, 36, 50, 60, 80, 120
Maximum RPM
13,300
Use
Dry use only
Quantity
25 Discs
Product Features
Sharp silicon carbide abrasive for fast cutting and controlled material removal.
Highly friable grain continually fractures to expose fresh cutting edges.
Produces a consistent, uniform scratch pattern.
Excellent performance on masonry, stone, glass, and many non-ferrous materials.
Heat-resistant phenolic resin bond for durability during grinding and sanding.
Heavy-duty vulcanized fiber backing provides strong support under working pressure.
Resistant to heat, glazing, and loading.
Wide grit range for aggressive material removal through finer blending and surface preparation.
7/8" center hole for use with compatible right-angle grinder backing pads.
Use only with a grinder, guard, backing pad, and retaining hardware approved for the same disc diameter and attachment. The grinder's rated speed must not exceed the maximum RPM of the lowest-rated component in the system.
Applications
Ideal for grinding, sanding, deburring, and surface preparation applications including:
Stock removal
Surface leveling
Shaping and contouring
Edge preparation
Deburring
Cleaning and surface preparation
Blending and smoothing
Removing surface imperfections
Grinding masonry and stone
Glass edge deburring
Aggressive sanding on selected non-metal materials
Materials
Commonly used on:
Stone
Marble
Granite
Engineered Stone
Concrete
Glass
Copper
Other Non-Ferrous Metals
Fiberglass
Plastics and Composites
Hard Rubber
Wood
Not Recommended for Steel or Stainless Steel: While silicon carbide is extremely hard and sharp, it is highly friable and breaks down too quickly under the sustained grinding pressure typically used on steel. For carbon steel and stainless steel, Benchmark recommends Aluminum Oxide, Zirconia, or Ceramic resin fiber discs depending on the application and desired performance level.
Tip: Silicon carbide cuts quickly because its sharp grain fractures readily during use. Use controlled pressure and allow the abrasive to cut rather than forcing the grinder excessively, especially on brittle materials such as stone, glass, or composites.
Silicon Carbide vs. Aluminum Oxide, Zirconia & Ceramic
Silicon Carbide
Silicon Carbide is the preferred choice for masonry, stone, glass, many non-ferrous materials, and other hard or brittle surfaces. Its extremely sharp, friable grain cuts quickly and produces a consistent scratch pattern, but it wears too rapidly to be the best option for sustained steel grinding.
Aluminum Oxide
Aluminum oxide is the economical, versatile choice for general-purpose grinding on steel and a broad range of everyday shop applications.
Zirconia
Zirconia provides greater durability and longer life than Aluminum Oxide under sustained grinding pressure, making it an excellent choice for heavier steel fabrication, weld removal, and stock removal.
Ceramic
Ceramic is the premium choice for demanding production grinding, stainless steel, hard alloys, and applications where maximum cutting speed and abrasive life are the priority.
Extremely sharp cutting action and uniform scratch pattern
Aluminum Oxide
General-purpose steel and everyday grinding
Economical and versatile
Zirconia
Steel fabrication and sustained heavy grinding
Longer life and strong cutting performance
Ceramic
Stainless steel, hard alloys, high-production grinding
Fastest cutting and longest life in demanding metal applications
Choosing the correct abrasive grain is just as important as choosing the correct grit. Silicon Carbide should be selected for the materials it excels on rather than simply as a more aggressive alternative to conventional metal-grinding abrasives.
Safety Tips & Techniques
Always use a compatible backing pad specifically designed for resin fiber discs.
Inspect the disc and backing pad before use. Do not use damaged, cracked, torn, or moisture-compromised discs.
Never operate the grinder above the maximum RPM marked for the disc or backing pad. The grinder's rated speed must not exceed the lowest accessory rating; follow all tool and accessory instructions.
Keep the grinder guard properly installed and positioned.
Use controlled working pressure and allow the sharp silicon carbide grain to cut.
Keep the grinder moving across the workpiece to prevent excessive localized heat or gouging.
Use extra care when grinding brittle materials such as stone, masonry, glass, or composites.
Store fiber discs in a clean, dry environment to protect the vulcanized fiber backing from moisture and damage.
Do not use these Silicon Carbide discs for steel or stainless steel applications where Aluminum Oxide, Zirconia, or Ceramic abrasives will provide better performance.
Frequently Asked Questions
Silicon carbide resin fiber discs are used for grinding, sanding, shaping, deburring, blending, and surface preparation on materials such as stone, marble, granite, concrete, glass, copper, fiberglass, plastics, composites, hard rubber, and selected wood applications.
Silicon carbide is an extremely hard and sharp abrasive grain. It is also highly friable, meaning the grain fractures readily during use and continually exposes fresh cutting edges. This gives silicon carbide fast cutting action and a consistent scratch pattern, particularly on hard, brittle, and non-ferrous materials.
Benchmark does not recommend these discs for steel or stainless steel. Silicon carbide breaks down too quickly under the sustained grinding pressure commonly used on steel, resulting in poor abrasive life and performance. Use Aluminum Oxide, Zirconia, or Ceramic resin fiber discs for steel applications instead.
Yes. Stone, marble, granite, concrete, and other masonry materials are among the primary applications for silicon carbide resin fiber discs. The sharp, hard abrasive grain cuts these materials effectively and provides a controlled scratch pattern.
Yes. Silicon carbide is commonly used for grinding and deburring glass because its sharp grain performs effectively on hard, brittle materials. Use controlled pressure and proper safety equipment when working with glass.
Yes. Benchmark lists copper and other non-ferrous materials among the recommended applications for these discs. Silicon carbide's sharp cutting action makes it a good option for many non-ferrous grinding and surface preparation applications.
Yes, for selected aggressive sanding and material-removal applications. Silicon carbide cuts quickly, so use controlled pressure and select the grit carefully to avoid removing more material than intended.
Yes. Resin fiber discs must be supported by a compatible backing pad during use. This 4-1/2" disc uses a matching 4-1/2" backing pad designed for a right-angle grinder. Backing pads are sold separately.
Use 16–36 grit for heavy stock removal, shaping, and aggressive grinding. Use 50–60 grit for general grinding, deburring, and blending. Use 80–120 grit for finer smoothing and surface preparation.
The maximum rated speed for these 4-1/2" Silicon Carbide Resin Fiber Discs is 13,300 RPM. Never exceed the rated speed of the disc, backing pad, or grinder. Always operate at the lowest maximum RPM specified among the components being used.
Choose Silicon Carbide when working on stone, masonry, glass, non-ferrous materials, or other hard and brittle surfaces. Choose Ceramic primarily for demanding metal grinding, especially stainless steel, titanium, hard alloys, and production applications where abrasive life and sustained cutting speed are the priority.
Benchmark Abrasives 4-1/2" silicon carbide resin fiber discs deliver fast cutting action and a consistent scratch pattern on non-ferrous metals, masonry, stone, glass, fiberglass, plastics, hard rubber, and selected wood applications. Silicon carbide is an extremely hard, sharp, and highly friable abrasive grain that fractures readily during use to expose fresh cutting edges, making it especially effective on hard, brittle materials and surfaces where conventional metal-grinding abrasives are not the best choice.
Each disc uses silicon carbide abrasive electrostatically bonded to a heavy-duty vulcanized fiber backing with heat-resistant phenolic resin. The rigid fiber backing provides strong support under grinding pressure and helps transfer power efficiently to the workpiece for controlled stock removal. Available from aggressive 16 grit through finer 120 grit, these discs can handle heavy material removal, shaping, deburring, blending, and surface preparation across a wide range of non-ferrous and non-metal applications.
These discs are designed for use on right-angle grinders with a compatible 4-1/2" backing pad. A backing pad is required and sold separately.
Quantity: 25 Discs
Dimensions & Specifications
Specification
Details
Disc Diameter
4-1/2"
Arbor / Center Hole
7/8"
Abrasive Grain
Silicon Carbide
Backing
Vulcanized Fiber
Available Grits
16, 24, 36, 50, 60, 80, 120
Maximum RPM
13,300
Use
Dry use only
Quantity
25 Discs
Product Features
Sharp silicon carbide abrasive for fast cutting and controlled material removal.
Highly friable grain continually fractures to expose fresh cutting edges.
Produces a consistent, uniform scratch pattern.
Excellent performance on masonry, stone, glass, and many non-ferrous materials.
Heat-resistant phenolic resin bond for durability during grinding and sanding.
Heavy-duty vulcanized fiber backing provides strong support under working pressure.
Resistant to heat, glazing, and loading.
Wide grit range for aggressive material removal through finer blending and surface preparation.
7/8" center hole for use with compatible right-angle grinder backing pads.
Use only with a grinder, guard, backing pad, and retaining hardware approved for the same disc diameter and attachment. The grinder's rated speed must not exceed the maximum RPM of the lowest-rated component in the system.
Applications
Ideal for grinding, sanding, deburring, and surface preparation applications including:
Stock removal
Surface leveling
Shaping and contouring
Edge preparation
Deburring
Cleaning and surface preparation
Blending and smoothing
Removing surface imperfections
Grinding masonry and stone
Glass edge deburring
Aggressive sanding on selected non-metal materials
Materials
Commonly used on:
Stone
Marble
Granite
Engineered Stone
Concrete
Glass
Copper
Other Non-Ferrous Metals
Fiberglass
Plastics and Composites
Hard Rubber
Wood
Not Recommended for Steel or Stainless Steel: While silicon carbide is extremely hard and sharp, it is highly friable and breaks down too quickly under the sustained grinding pressure typically used on steel. For carbon steel and stainless steel, Benchmark recommends Aluminum Oxide, Zirconia, or Ceramic resin fiber discs depending on the application and desired performance level.
Tip: Silicon carbide cuts quickly because its sharp grain fractures readily during use. Use controlled pressure and allow the abrasive to cut rather than forcing the grinder excessively, especially on brittle materials such as stone, glass, or composites.
Silicon Carbide vs. Aluminum Oxide, Zirconia & Ceramic
Silicon Carbide
Silicon Carbide is the preferred choice for masonry, stone, glass, many non-ferrous materials, and other hard or brittle surfaces. Its extremely sharp, friable grain cuts quickly and produces a consistent scratch pattern, but it wears too rapidly to be the best option for sustained steel grinding.
Aluminum Oxide
Aluminum oxide is the economical, versatile choice for general-purpose grinding on steel and a broad range of everyday shop applications.
Zirconia
Zirconia provides greater durability and longer life than Aluminum Oxide under sustained grinding pressure, making it an excellent choice for heavier steel fabrication, weld removal, and stock removal.
Ceramic
Ceramic is the premium choice for demanding production grinding, stainless steel, hard alloys, and applications where maximum cutting speed and abrasive life are the priority.
Extremely sharp cutting action and uniform scratch pattern
Aluminum Oxide
General-purpose steel and everyday grinding
Economical and versatile
Zirconia
Steel fabrication and sustained heavy grinding
Longer life and strong cutting performance
Ceramic
Stainless steel, hard alloys, high-production grinding
Fastest cutting and longest life in demanding metal applications
Choosing the correct abrasive grain is just as important as choosing the correct grit. Silicon Carbide should be selected for the materials it excels on rather than simply as a more aggressive alternative to conventional metal-grinding abrasives.
Safety Tips & Techniques
Always use a compatible backing pad specifically designed for resin fiber discs.
Inspect the disc and backing pad before use. Do not use damaged, cracked, torn, or moisture-compromised discs.
Never operate the grinder above the maximum RPM marked for the disc or backing pad. The grinder's rated speed must not exceed the lowest accessory rating; follow all tool and accessory instructions.
Keep the grinder guard properly installed and positioned.
Use controlled working pressure and allow the sharp silicon carbide grain to cut.
Keep the grinder moving across the workpiece to prevent excessive localized heat or gouging.
Use extra care when grinding brittle materials such as stone, masonry, glass, or composites.
Store fiber discs in a clean, dry environment to protect the vulcanized fiber backing from moisture and damage.
Do not use these Silicon Carbide discs for steel or stainless steel applications where Aluminum Oxide, Zirconia, or Ceramic abrasives will provide better performance.
Frequently Asked Questions
Silicon carbide resin fiber discs are used for grinding, sanding, shaping, deburring, blending, and surface preparation on materials such as stone, marble, granite, concrete, glass, copper, fiberglass, plastics, composites, hard rubber, and selected wood applications.
Silicon carbide is an extremely hard and sharp abrasive grain. It is also highly friable, meaning the grain fractures readily during use and continually exposes fresh cutting edges. This gives silicon carbide fast cutting action and a consistent scratch pattern, particularly on hard, brittle, and non-ferrous materials.
Benchmark does not recommend these discs for steel or stainless steel. Silicon carbide breaks down too quickly under the sustained grinding pressure commonly used on steel, resulting in poor abrasive life and performance. Use Aluminum Oxide, Zirconia, or Ceramic resin fiber discs for steel applications instead.
Yes. Stone, marble, granite, concrete, and other masonry materials are among the primary applications for silicon carbide resin fiber discs. The sharp, hard abrasive grain cuts these materials effectively and provides a controlled scratch pattern.
Yes. Silicon carbide is commonly used for grinding and deburring glass because its sharp grain performs effectively on hard, brittle materials. Use controlled pressure and proper safety equipment when working with glass.
Yes. Benchmark lists copper and other non-ferrous materials among the recommended applications for these discs. Silicon carbide's sharp cutting action makes it a good option for many non-ferrous grinding and surface preparation applications.
Yes, for selected aggressive sanding and material-removal applications. Silicon carbide cuts quickly, so use controlled pressure and select the grit carefully to avoid removing more material than intended.
Yes. Resin fiber discs must be supported by a compatible backing pad during use. This 4-1/2" disc uses a matching 4-1/2" backing pad designed for a right-angle grinder. Backing pads are sold separately.
Use 16–36 grit for heavy stock removal, shaping, and aggressive grinding. Use 50–60 grit for general grinding, deburring, and blending. Use 80–120 grit for finer smoothing and surface preparation.
The maximum rated speed for these 4-1/2" Silicon Carbide Resin Fiber Discs is 13,300 RPM. Never exceed the rated speed of the disc, backing pad, or grinder. Always operate at the lowest maximum RPM specified among the components being used.
Choose Silicon Carbide when working on stone, masonry, glass, non-ferrous materials, or other hard and brittle surfaces. Choose Ceramic primarily for demanding metal grinding, especially stainless steel, titanium, hard alloys, and production applications where abrasive life and sustained cutting speed are the priority.
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