THE "SECURAL" PROCESS FOR COLOUR PENCILS

By virtue of its composition and due to the lack of a firing process, a colour pencil lead is substantially softer than a pencil lead.

That is also why colour pencil leads have a larger diameter than pencil leads. (pencil lead diameter 2.0–2.8 mm; colour pencil lead diameter 3.0–3.3 mm)

For the purpose of enhancing breaking resistance, firm bonding of the colour pencil lead to the wood is even more important than in pencil manufacturing. Besides, this is the only way to prevent the lead from slipping out of the wood casing and to avoid tip breakage.