Question

Pen and it's refills are made of different plastics. Why?

Answer 1

Three kinds of plastics are used in Use and Throw Pens. The Pen Cap is made up of HIPS, Pen Body is made up of PS(Transparency nature), the Body top and bottom cap is made up of polyolefins.
All these plastics come under the category of Thermoplastics which make it recyclable.

Answer 2

A ballpoint pen is a writing instrument which
features a tip that is automatically refreshed
with ink. It consists of a precisely formed
metal ball seated in a socket below a reservoir
of ink. As the pen is moved along a writing