An eraser is a common stationery tool, but few people know how it actually removes pencil marks.

The basic principle

An eraser does not “erase” pencil marks in a chemical way.
Instead, it removes graphite through friction.

When you rub an eraser on paper:

• The rubber material creates friction

• Tiny pieces of the eraser break off

• These fragments stick to graphite particles

• The graphite is lifted away from the paper surface

Why pencil marks can be erased

Pencil marks are made of graphite, which:

• Stays on the surface of paper fibers

• Does not deeply penetrate the paper

• Can be removed through physical rubbing

This is why pencils are erasable.

Why ink cannot be erased

Ink from pens behaves differently:

• It absorbs into paper fibers

• Becomes part of the paper structure

• Cannot be removed by friction alone

That’s why pen writing is permanent.

What erasers are made of

Modern erasers are usually made from:

• Natural rubber

• PVC or PVC-free synthetic materials

• Thermoplastic elastomers (TPE)

Each material affects softness, cleanliness, and erasing performance.

Fun fact

The small debris you see after erasing is a mix of:

• Eraser particles

• Graphite dust

These particles help “carry away” the pencil marks.

In short:
An eraser works by lifting graphite off the paper, not by wiping it away.