1. What Silicon Carbide Actually Is

Silicon carbide is a covalent chemical compound made of silicon (Si) and carbon (C) atoms in a 1:1 ratio. The chemical formula is SiC. It's classified as a ceramic — specifically, an advanced technical ceramic — because it's an inorganic, non-metallic solid with a crystalline structure.

The crystal structure is what gives SiC its remarkable properties. Each silicon atom bonds to four carbon atoms, and each carbon atom bonds to four silicon atoms, forming a tetrahedral lattice that extends in all directions. The result is what materials scientists call a giant covalent network — essentially one massive interlocked structure rather than discrete molecules. This is the same kind of structure found in diamond (which is a giant covalent network of carbon atoms), and it's the reason silicon carbide and diamond share many properties: extreme hardness, very high melting point, electrical insulation in pure form, and chemical inertness.

Where SiC comes from

Silicon carbide exists in nature as the mineral moissanite, named after French chemist Henri Moissan who first identified it in 1893 in samples from the Canyon Diablo meteorite in Arizona. Natural moissanite is extremely rare — most of it on Earth came from meteorites or formed under conditions like those near supernova explosions. As a natural mineral, it's far rarer than diamond.

Almost all silicon carbide used in industry today is produced synthetically. The dominant production method is the Acheson process, developed by American chemist Edward Acheson in 1891. Acheson was actually trying to synthesize diamond when he accidentally produced silicon carbide by heating silica sand and carbon (typically petroleum coke) to extreme temperatures — around 2,000-2,500°C. He named the resulting material "Carborundum," combining "carbo" from carbon and "-undum" from corundum (aluminum oxide). The name stuck for over a century, and "Carborundum" is still used today as a generic term for silicon carbide, particularly in older industrial contexts.

Modern silicon carbide production has evolved beyond the original Acheson process to include chemical vapor deposition (CVD), physical vapor transport (PVT), and other methods that produce purer, more controlled crystal structures. The exact production method depends on the application — semiconductor-grade SiC requires far purer crystals than abrasive-grade SiC.

2. The 4 Properties That Make SiC Unique

Silicon carbide is one of a small handful of materials that combines extreme hardness, extreme thermal stability, chemical inertness, and the ability to be engineered into specific particle sizes. Each of these properties matters for engine treatment, and the combination is what makes SiC viable where other ceramics or additives aren't.

The combination matters more than any individual property. Diamond is harder than SiC, but it can't be engineered into engine-treatment particles cost-effectively. Aluminum oxide (corundum) is a similar hardness but reactive with certain oils. PTFE (Teflon) is chemically inert but has very low hardness and breaks down at engine temperatures. Boron-based friction modifiers are non-reactive and effective but consumable — they get replaced at every oil change.

Silicon carbide is the only material that combines diamond-class hardness, refractory-class thermal stability, glass-class chemical inertness, and the engineering flexibility to be made into the specific nanoscale particle sizes needed for engine application. That's the foundation of Cerma STM-3's value proposition — the chemistry is unique to the application, not interchangeable with other treatments.

3. "Nano" SiC vs Bulk Silicon Carbide — What's Different

Bulk silicon carbide is what you'd find in industrial applications: grinding wheels, ceramic brake rotors, semiconductor wafers, ballistic armor plates. The material is the same SiC chemistry, but the form is solid pieces or coatings — millimeters or centimeters in dimension. Useful for those applications, but obviously not suitable for adding to engine oil.

Nano Silicon Carbide refers to silicon carbide that's been engineered into particles at the nanoscale — typically 50 to 300 nanometers (nm) in their largest dimension. For reference, a human hair is roughly 80,000 nm thick. Engine oil flow passages and bearing clearances are typically measured in microns (1 micron = 1,000 nm), which means nano-sized SiC particles are small enough to flow freely through every part of an engine's lubrication system.

Why size matters for engine treatment

The reason particle size is critical is simple: an engine has microscopic gaps and tolerances that the protective material has to fit through. Bearing clearances on a typical automotive crankshaft are around 0.001-0.003 inches (25-75 microns). Cylinder cross-hatch grooves are typically 0.5-2 microns deep. Oil control ring scraper edges have working clearances measured in microns.

For a ceramic protection system to work at all of these contact points, the particles have to be:

• Small enough to flow through every passage — bearings, oil control rings, hydraulic lifters, turbocharger bearings, valve guides.
• Small enough to fit into surface microstructure — the microscopic grooves, scratches, and surface irregularities that exist on every engine metal surface even when new.
• Large enough to provide measurable mechanical protection — too small, and the particles can't form a continuous matrix on the metal surface.

The 50-300 nm range hits all three criteria. Smaller than oil control ring clearances, larger than the molecular scale where the particles would behave more like dissolved species than solid ceramic. This is also small enough to remain suspended in oil indefinitely — large particles would settle out at the bottom of the oil pan; nanoscale particles are kept in suspension by the natural Brownian motion of oil molecules.

4. How Nano Silicon Carbide Bonds to Engine Metal

This is the part of the story that drives the most curiosity — and reasonable skepticism. How does a ceramic particle suspended in oil end up bonded permanently to engine metal in a way that survives every future oil change?

The answer is that the bonding is mechanical, not chemical. There's no chemical reaction between SiC and steel, aluminum, or other engine metals. Instead, the bond comes from the conditions present in every running engine and the way nanoscale ceramic particles behave under those conditions.

The conditions that drive bonding

Three things happen continuously in every operating engine:

• Heat: Oil temperatures typically reach 200-260°F under normal operation, and surface temperatures at metal-on-metal contact points (cylinder walls during combustion, bearing journals under load) can be much higher locally.
• Pressure: Bearing zones experience hydrodynamic oil film pressures of thousands of PSI. Cam-on-lifter contact and piston-on-cylinder-wall contact involve momentary pressure spikes of similar magnitude.
• Friction: Every metal-on-metal contact in the engine creates microscopic surface deformation as the metals slide against each other. This is the wear that engines accumulate over time.

When Nano SiC particles are present in the oil and encounter these conditions, the particles get mechanically pressed and embedded into the microscopic surface irregularities of the engine metal. The ceramic is harder than the metal, so the metal surface deforms slightly to accommodate the particle while the particle itself stays intact. Over the first 3,000-5,000 miles of driving, this process accumulates particles into the surface texture of bearing journals, cylinder walls, cam lobes, and every other oil-lubricated wear surface.

Why the bond is permanent

Once the particles are embedded in the metal surface microstructure, they stay there. Three reasons:

• Mechanical anchoring: The particles are physically lodged into surface features — there's no chemical bond holding them in, but there's also no force trying to dislodge them in routine operation.
• Chemical inertness: SiC doesn't react with engine oil, fuel, combustion byproducts, oil additives, detergents, or anything else inside the engine. Oil changes don't dissolve it or wash it away.
• Hardness mismatch: Once SiC is on the metal surface, future friction occurs against the SiC rather than against the metal underneath. The ceramic is harder than anything it encounters, so it doesn't wear off — it acts as a sacrificial layer that protects the metal beneath it.

This is why Cerma STM-3 is described as a "one-time, permanent" treatment. The first 3,000-5,000 miles do the work of bonding the ceramic. After that, you have ceramic protection for the life of the engine — through every oil change, every towing season, every cold start. There's nothing to reapply because there's nothing being consumed.

5. Why SiC Outperforms Other Engine Treatment Chemistries

Engine oil additives have been around for decades, and several distinct chemistries have been tried. Each has its purpose, but most are designed for temporary effects rather than permanent protection. Understanding the chemistry differences explains why Cerma STM-3 sits in a different category from most products labeled "engine treatment."

Each of these chemistries solves a real problem. ZDDP restoration matters for older flat-tappet engines. Solvents matter for cleaning carbon buildup. Friction modifiers matter for stiction and short-term wear reduction. Synthetic base oils matter for high-stress operation. None of them is "wrong."

What's distinctive about Nano Silicon Carbide is that it's the only chemistry on this list that creates a permanent change to the engine itself. Every other chemistry above lives in the oil and gets replaced at every oil change. Cerma's ceramic lives in the engine metal and stays there — which is why it has a different cost structure (one-time purchase vs recurring) and a different value proposition (long-term protection vs short-term effect).

6. Where Else Silicon Carbide Is Used

Silicon carbide isn't a niche material invented for engine treatment. It's been an industrial staple for over 130 years, and its widespread use in demanding applications is part of what gives it credibility as engine protection. If a material is reliable enough for semiconductor manufacturing and ballistic armor, it's reliable enough for an engine.

Industrial abrasives

Silicon carbide was originally developed (and named "Carborundum") for use as an industrial abrasive. Today it's still one of the most widely used materials in grinding wheels, sandpaper, sanding belts, and high-pressure waterjet cutting. The hardness that makes SiC valuable as an abrasive is the same property that makes it valuable as an engine wear layer.

Refractory materials

The high melting point and thermal stability of SiC make it ideal for furnace linings, kiln furniture, and crucibles. Industrial smelting and ceramic firing operations rely on SiC components to handle temperatures that would destroy most other materials.

Ceramic brake rotors

High-end performance vehicles — Porsche, Ferrari, McLaren, Bugatti, Corvette ZR1 — use carbon-ceramic brake rotors that incorporate silicon carbide. The same hardness and thermal stability that protect engines protect brake systems from extreme heat and friction during high-performance driving.

Power semiconductors

One of the fastest-growing applications for SiC is in power electronics. Silicon carbide semiconductors can operate at higher temperatures, voltages, and switching frequencies than traditional silicon. They're used in electric vehicle inverters (Tesla's drivetrain electronics, for example), solar inverters, and high-power industrial equipment. This is a very different SiC application than engine treatment, but it underlines how versatile the base material is.

Ballistic armor

Silicon carbide ceramic plates are used in body armor and vehicle armor for military and law enforcement applications. The hardness and low density of SiC make it effective at stopping high-velocity projectiles while remaining lighter than equivalent steel armor.

Aerospace components

SiC composites are used in aerospace applications where heat-resistant, lightweight ceramic components are needed — engine components, heat shields, and structural elements in next-generation aircraft and spacecraft.

7. How Cerma Engineers Silicon Carbide for Engine Application

Taking raw silicon carbide and turning it into a consumer engine treatment requires solving a few engineering problems that don't apply to industrial SiC users. Cerma's STM-3 product is the result of how those problems get solved.

Particle size engineering

Industrial SiC abrasive grain sizes range from #16 (very coarse, ~1.2 mm) to #1200 and finer (~5-10 microns). Even the finest standard abrasive grades are far too large for engine application. Cerma's SiC is engineered to nanoscale dimensions — small enough to flow through bearing clearances and embed into surface microstructure, large enough to provide structural protection.

Suspension stability

Nanoscale particles need to remain evenly suspended in the carrier oil rather than settling out before they have a chance to bond to engine metal. This requires careful engineering of particle surface chemistry and carrier fluid composition.

Compatibility with engine oil chemistry

Modern engine oils contain complex additive packages — detergents, dispersants, anti-wear additives (ZDDP), viscosity modifiers, antioxidants. The SiC treatment has to be inert to all of these so it doesn't disrupt the oil's intended chemistry. Silicon carbide's chemical inertness is what makes this possible.

EPA ETV verification

Cerma STM-3 is one of the only ceramic engine treatments to hold EPA Environmental Technology Verification (ETV) certification. The ETV process is independent third-party testing that verifies specific performance claims — fuel economy, emissions, engine temperature reduction — under controlled conditions. This is a meaningful credential that distinguishes Cerma from products that rely on internal testing alone.

The result is a consumer-installable engine treatment that delivers the protective benefits of industrial-grade silicon carbide ceramics through a simple oil-fill application. Pour the bottle in at your next oil change. Drive normally. The first 3,000-5,000 miles do the bonding work. After that, you have permanent ceramic protection for the life of the engine.

Why the Chemistry Matters

Frequently Asked Questions