User Manual

Product information
Erasers - Sharpeners
1.5 Synthetic rubber eraser tips
STAEDTLER eraser tips are made out of thermoplastic elastomeres (TPE), i.e. synthetic rubber.
A key advantage of TPE is that it can be processed using heat only, no other treatment is
necessary. It is ready for use immediately after cooling.
However, in the case of natural rubber identical synthetic rubber – and natural rubber too for
that matter – the material has to vulcanised in order to bind the polymers together to create the
required elastic characteristics.
The vulcanisation process requires the employment of chemicals and additional energy – this is
not the case when TPE is used.
Illustration 2: Eraser tips for pencils
TPE erasers are particularly suitable for use as eraser cores
thanks to their high level of elasticity.
They are also used for eraser tips for pencils and
mechanical pencils as well as in Mars rasor, an eraser pencil
which can be used for erasing typewriter, ballpoint pen,
writing and drawing inks.
Eraser tip composition
 Thermoplastic elastomere
 Fillers such as chalk, pumice or glass powder
 Colour pigments (heavy metal pigments are not used)
 Softening agents, e.g. paraffin oil
Note
 STAEDTLER eraser tips are latex-free
 2002 STAEDTLER MARS GmbH & Co. Page 5 of 13
version 07. 2002 subject to change