Blog of Orbray Co., Ltd.

Industry first: Flexible zirconia film with surface roughness Ra 5 nm and thickness 20 μm

   Last Modified:    Published: 2024/04

Orbray Co., Ltd. (Headquarters: Adachi-ku, Tokyo; President: Riyako Namiki; hereinafter referred to as "Orbray") has successfully produced the industry's first 20 μm thick, flexible zirconia film with an exceptionally smooth surface.

Zirconia ceramic materials have excellent heat resistance, corrosion resistance, strength, wear resistance, and fracture toughness characteristics. Orbray has extended the potential applications for zirconia ceramics by using its ultra-thin polishing technology to create flexible zirconia film. In doing so, we also achieved surface roughness of Ra < 5 nm, a first in the industry.

This novel material is anticipated to find uses in various applications, such as circuit and sensor boards, flexible heaters, heat insulating films, and diaphragms. Additionally, the flexible zirconia film's high dielectric constant and low dielectric dissipation factor make it suitable for creating antennas, supporting their miniaturization and integration into IC card substrates. While zirconia ceramics is known for its high strength, its brittleness is a drawback, as it tends to break when bent. However, polishing the surface very evenly using Orbray's ultra-thin polishing technology gives the zirconia film flexibility.

Industry first: Zirconia film with a surface roughness of Ra < 5nm, and thickness of 20µm


  1. Industry first: Surface roughness of Ra < 5nm
  2. Film thickness: 20 μm
  3. Flexible
  4. Heat resistance, corrosion resistance, high strength, wear resistance, high fracture toughness


Thickness  20µm〜※1
Surface roughness (Ra)  <5nm
3-point bending strength  1,200MPa
Fracture toughness  5MPa・√m
Vickers' hardness  HV1,250
Coefficient of linear expansion  10.5✕10-6/K(40〜400℃)
Relative dielectric constant  32(25℃, 1MHz)
Dielectric dissipation factor  2.5✕10-3(25℃, 1MHz)
Heat resisting temperature  1,200℃
Thermal conductivity  3W/m・K(20℃)
※1 Sample ①: 15mm✕15mm✕15µm.  Sample ②: 55mm✕91mm✕30µm (business card size).

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