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Newsletter "SEI NEWS" 2012

Home > Company Information > SEI WORLD > Back number > Vol.423

[Newsletter "SEI NEWS" Vol.423]


Sumitomo Electric patented its polytetrafluoroethylene (PTFE) expanding technology in 1963, promoted its R&D in the 1970s and began manufacture and sales in 1982. Poreflon is presently manufactured by Sumitomo Electric Fine Polymer, Inc.

■Product Data

Start of production 1982
Production base Japan

What Is Poreflon?

Poreflon is the trade name for a porous material produced by Sumitomo Electric from 100% polytetrafluoroethylene (PTFE). The material exhibits excellent chemical resistance, high strength, high water permeability, and high heat resistance.

What Is Poreflon Used for?

Alkaline water purifier (contains membranes from Sumitomo Electric)(Courtesy: Nihon Trim Co., Ltd.)

Poreflon is used as filter membrane in many areas such as the semiconductor, liquid crystal, pharmaceutical and food industries.

In addition to filtration applications, Poreflon is used as a waterproof film for electronic components in automobiles and home electrical products, wire coverings, battery membranes, and electrolytic membranes in alkaline water purifiers, due to its water repellency, weather resistance and low dielectric properties.

■Interview with engineer in charge
What are the difficulties in manufacturing Poreflon?

Hiroyuki Tsujiwaki Functional Fluororesin Products General Planning Unit Sumitomo Electric Fine Polymer, Inc.

A vitally important quality element with Poreflon products is pore diameter, considering their applications. Pore diameter control parameters are involved in all processes from mixing fine PTFE powder with lubrication aids, molding, extrusion, rolling and expansion, to heat fixation. Pore diameter requirements range from a few nanometers to 10 μm. We use our proprietary processing technology to control pore diameters with precision.

What features of Sumitomo Electric’s products are well received by customers?

Poreflon products are used in various applications. It is common that even in the same application, form, pore diameter and membrane thickness requirements differ with the operating environment. We offer an extensive line of products and services to meet diverse customer needs, which has been the key to the high level of customer satisfaction we have achieved.

What is a new product you have recently developed?

We have developed and put into mass production a high-flow rate membrane, which features a flow rate double that of conventional products of the same pore diameter. Offering normally contradictory properties of small pore diameter and high flow rate, this membrane has been well accepted by customers and is used principally in the semiconductor industry.


・Poreflon is a trademark or registered trademark of Sumitomo Electric Industries, Ltd.

2012 Index
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