|1957 –||Dow Corning Corporation implements technology
|1960 –||Hemlock Semiconductor’s Michigan site is
selected for the first fully integrated
polycrystalline silicon plant.
|1961 –||Polycrystalline silicon production
|1969 –||The end of a decade in which the site doubles
its manufacturing capabilities
three times, largely due to the growth of the electronics industry.
|1979 –||Hemlock Semiconductor Corporation is formed
as a wholly-owned subsidiary
of Dow Corning Corporation.
|1984 –||Hemlock Semiconductor Corporation becomes a
joint venture of Dow Corning
and two of Japan’s largest single-crystal wafer manufacturers, Shin-Etsu
Handotai Co., Ltd. and Mitsubishi Materials Corporation.
|1986 –||Hemlock Semiconductor Corporation triples its
previous capacity, focusing on
leading-edge processing technology, advanced chemical purification, and
parts-per-trillion analysis techniques.
|1989 –||The use of cleanroom processing for
polycrystalline silicon finishing operations
was improved and expanded.
|1992 –||Hemlock Semiconductor Corporation expands its
production capacity by 20 percent and achieves ISO 9002 registration.
|1994 –||Hemlock Semiconductor Corporation becomes one
of the world’s largest
producers/suppliers of polycrystalline silicon.
|1995 –||A major expansion results in a total site
capacity of 4,000 MT per year of
polycrystalline silicon production.
|1997 –||Another significant expansion results in an
additional 40 percent polycrystalline
silicon production capacity.
|1999 –||The site increases production to 6,200 MT.
Technology advancements provide
an ultra-clean polycrystalline silicon product in anticipation of future
mm wafer supply requirements.
|2002 –||ISO 9001:2000 certification achieved. Hemlock
enters the market as a manufacturer of solar-grade polysilicon.
|2005 –||$500 million expansion that will increase
capacity by 100 percent announced;
|2006 –||The Michigan site increases production to
10,0000 MT. “Solar 2” production
capacity expansion is approved and contracted for up to 19,000 MT, starting
2009 a global “Green Site” search for a second production location is
|2007 –||$1 billion expansion to increase the
company’s total annual output of
polysilicon to 36,000 metric tons announced.
|2008 –||A $1 billion expansion in Michigan and $1.2
billion investment in a new plant in
Tennessee are announced.
|2009 –||Site construction begins at a new plant in
Tennessee; new capacity is brought
on line in Michigan.
|2010 –||Vice President Joe Biden tours Michigan site;
Tennessee site project team
moves into the first on-site building.
|2011 –||Hemlock Semiconductor celebrates 50th