The Bielefeld, Germany-based speciality paper manufacturer is making the adjustment in response to increased costs of raw materials and logistics.
Thermoscript is used for a variety of applications including point-of-sale, labels and tickets.
The company said customers would be contacted on an individual basis with further information.
It last increased the price of Thermoscript five months ago.
Mitsubishi HiTec Paper Europe produces high-quality direct thermal, inkjet, carbonless, and barrier papers for flexible packaging.
Its brands include Giroform, Jetscript and Barricote.