Oki Develops a Flexible and Eco-friendly Heat Radiation Sticker, "Stick-it Flexible"
- With only 0.3mm Thick, Dissipating up to 20% of Heat Generated by Electronic Equipment -

"The development of Stick-it Flexible and heat-radiating liquid ceramic paint are epoch-making because they can replace heat sinks, which occupies spaces in electronic equipment. I believe these products match the market requirements for efficient downsizing and power-saving of electronic equipment," said Harushige Sugimoto, President of Manufacturing Service Company at Oki Electric.

The new jointly-developed Stick-it Flexible is an inorganic sticker coated with liquid ceramic paint. This paint is environmentally-friendly inorganic liquid, which dissipates the heat generated by electronic equipment using the excellent radiation characteristics of ceramics. By painting a 50µm to 150µm thin coating on electronic devices and parts at room temperature, it realizes a high radiation ratio of between 0.9 and 0.95 at around 80°C, which reduces the heat of an operating electrical device by 5% to 20%.

The heat radiation sticker offers the same characteristics as those of the liquid ceramic paint. It contains none of the chemicals required to register to a local government under the Pollutant Release and Transfer Register (PRTR) regulation. The sticker is only 0.3 mm thick, so can be easily cut with scissors and stuck to even curved surfaces. It can be stuck on aluminum, stainless steel, or even copper, nickel-plated steel sheet, and epoxy resin, surfaces which do not easily coated with liquid ceramic paint. It has a heat resistance of 120°C, which is compliant with UL 510 Flame Retardancy (FR), the flameproof standard for insulating tape.

The Stick-it Flexible and the ceramic paint can be used for wide range of devices, including power supplies, lighting equipment, and automobiles, replacing existing metal-plate heat sinks. As a result, they minimize the size, extend the life cycle, and reduce the noise and power consumption in electronic equipment.

Oki initially plans to market these products to the electronics equipment market, then expand the business into, for example, EMS service. This service means the painting of the liquid ceramic onto heat-generating parts. The company has set a sales target of 1 billion yen by the end of March 31, 2004, for heat-radiation liquid ceramic paint and related products, including Stick-it Flexible.

Sales plan for heat radiation sticker, Stick-it Flexible:

Major characteristics of the heat radiation sticker, Stick-it Flexible:

Major characteristics of the liquid ceramic paint:

1. High heat radiation characteristics:
   Heat dissipation using heat radiation transfer. Radiation ratio is between 0.9 and 0.95, and heat release effect marks from 5% to 20%.
2. Reduces heat loss by cooling operation heat from parts
3. Thinness of the heat sink enables compact and light design for electronic equipment:
   Reduces device footprint by approximately 30%
4. High usability:
   Can be painted in a thickness of 50µm and 150µm at room temperature, enabling use of various application methods, such as spraying, printing, and dipping
5. Flexible application
   Can be painted on almost any kinds of material
6. High reliability:
   Passed the high reliability tests required for telecommunications equipment

Mechanism of heat dissipation:

Current method: Heat conduction + heat convection	New method: Heat radiation

Outline of alliance:

Glossary:

- Heat sink

A device that releases the heat generated from an LSI package or electronic device. Generally, it diffuses the heat into the air (air-cooling). When natural convection is inadequate, forced-cooling using fans must be resorted to.

- Heat radiation

Release of heat by converting heat energy into electromagnetic waves

- Heat radiation ratio

The amount of infrared rays generated by a hated object, which varies according to material and surface type. Ideal black-body radiation (having a ratio of 1.0) is used as the comparison unit.
  Heat radiation ratio examples:

	Aluminum (polished surface)	0.04
	403 stainless-steel (processed surface)	0.07
	Molded plastic	0.85

Notes:

• Names of companies and products are trademarks or registered trademarks of the respective companies.

About Oki Electric Industry Co., Ltd.
Founded more than a century ago in 1881, Oki Electric Industry Co., Ltd. is Japan's first telecommunications manufacturer, with its headquarter in Tokyo, Japan. With the corporate vision, "Oki, Network Solutions for a Global Society," Oki Electric provides top-quality products, technologies and solutions to its customers through its telecommunications systems, information systems and electronic devices segments. All three segments are integrated into one effective organization that functions as a collective force to create exciting new products and technologies, including information and telecom converged solutions. Through its business activities, Oki Electric satisfies a spectrum of customer needs in various markets.