Asahi KaseiAsahi Kasei Corporation


Microporous Membrane



HIPORE™ is Asahi Kasei's polyolefin film, used in a wide range of high-technology fields, such as lithium ion battery separators.

The membranes look like plastic films, but are actually filled with microscopic pores. HIPORE™ is high-performance microporous membrane with wide range of thickness and highly uniform pores.

Micrograph of small pore diameter HIPORE™

Features of HIPORE™

1 Made of polyolefin, does not emit harmful gases when incinerated.
2 Available in a wide range of thicknesses with excellent uniformity of membrane thickness.
3 Available with uniform submicron pores.
4 High porosity, for outstanding liquid holding capacity.
5 High puncture strength, for improved safety and reliability.

Applications of HIPORE™

On the Intellectual Property Rights Relating to HIPORE™

Our company is the proprietor of multiple domestic and international patent rights covering a particular separator for use in a lithium ion secondary battery(HiporeTM). If it is your intention to produce, offer, put on the market, use, or import or possess for one or more of these purposes a separator for a lithium ion secondary battery, a lithium ion secondary battery making use of said separator or a final product making use of said battery, please pay special care and attention such that, in doing so, you do not violate any of Asahi Kasei's intellectual property rights.

OfficeHIPORE™ Intellectual–Property Policy

Asahi Kasei Corporation, Environmental Solutions SBU, Battery Materials Division
Hibiya Mitsui Tower 1-1-2 Yurakucho, Chiyoda-ku, Tokyo 100-0006
TEL +81-3-6699-3233 FAX +81-3-6699-3370