• Pencils

• Battery electrodes

High-strength composites in:

• Helicopter blades
• Tennis rackets

• Golf club shafts
• Artificial heart valves
• Lubricants
• Moderators for nuclear reactors

Diamonds:

• Ornaments
• Cutting, grinding, and polishing tools
• Styluses in high-quality record players
• Anvils for creating GigaPascal pressures
• Scratch-resistant coating

Activated carbon:

• Filtration and purification filters for adsorption of impurities
• Fuel/energy

Coke:

• Reduction of metals from ores

Buckminster Fullerenes:

• Lubricants
• Catalysts
• Polymers
• Superconducting Materials

Carbon Black or Lampblack:

• Pigment in black ink

• Automobile tires
• Carbon rods in dry-cell battery