Knives with TC Inserts: A practical guide for professional shredding

In the shredding industry—whether processing waste, plastics, wood, or tires—the quality of knives plays a critical role. Machine performance, component lifespan, and total operating costs often depend on one key decision: choosing the right knife.

One of the most effective solutions today is knives with TC inserts (tungsten carbide), combining exceptional durability, long service life, and consistent cutting performance.

 

What Are TC Inserts and Why Are They So Durable?

TC (tungsten carbide) is an extremely hard material used to reinforce the cutting edge of industrial knives.

Compared to standard steel knives, TC-insert knives offer:

• significantly longer service life
• higher resistance to wear
• stable cutting performance even on abrasive materials
• less frequent knife replacement
• lower maintenance and downtime costs

The result is higher productivity and reduced total operating costs.

 

What Is Tungsten Carbide Made Of?

Tungsten carbide (WC) is a composite material made primarily from:

1. Tungsten (W)

• A very dense, hard metal
• Extremely high melting point (~3,422°C)
• Provides hardness, strength, and heat resistance

 

2. Carbon (C)

• Chemically bonded with tungsten to form tungsten carbide crystals
• Creates an exceptionally hard ceramic-like compound

 

3. Binder Metal (usually Cobalt or Nickel)

• Acts as a glue that holds tungsten carbide grains together
• Adds toughness and impact resistance, preventing brittleness

👉 Typical industrial grades contain:

• 80–97% tungsten carbide (WC)
• 3–20% cobalt (Co) as a binder (or sometimes nickel)

 

Tungsten carbide is:

• 2–3× harder than steel
• Close to diamond in hardness
• Highly resistant to abrasion, wear, heat, and deformation

 

Practical Applications of TC Insert Knives

TC-insert knives are ideal for applications involving heavy wear and high load:

🔹 Tire Shredding

• highly abrasive rubber and steel reinforcements
• need for long-lasting cutting stability

🔹 Plastic Processing

• hard engineering plastics
• plastics with fillers and additives

🔹 Wood and Biomass Shredding

• reduced edge dulling
• extended lifespan in continuous operation

🔹 Municipal and Industrial Waste

• mixed materials
• increased resistance to damage and impact

 

OEM Manufacturers Using TC Technology

TC inserts are widely used by leading OEM shredder manufacturers, including:

• Lindner Recyclingtech – shredders for waste, plastics, and wood
• Jenz – professional biomass shredders
• Zerma – plastic granulation systems

These brands prioritize durability, efficiency, and reduced service downtime, which is why tungsten carbide knife technology is a proven standard.

 

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