Nippon Sanso Corporation, Parent Company of Matheson Tri-Gas, Inc., To Merge with Taiyo Toyo Sanso Corporation

Parsippany, New Jersey USA… Nippon Sanso Corporation, parent Company of
Matheson Tri-Gas, Inc., and Taiyo Toyo Sanso, both of Japan, have decided to
effect a merger between the two companies on an equal footing, subject to approval
by the shareholders of both companies and the relevant public authorities. The
date of the planned merger is October 1, 2004.

The English name of the new Company will be Nissan Taiyo Corporation. The
current Chairman from Taiyo Toyo, Mr. Konosuke Ose, will assume the position
of Chairman of the new Company, and Hiroshi Taguchi, current President and CEO
of Nippon Sanso Corporation, will be President of the new Company.

Mr. Taguchi states, “Nippon Sanso has tremendous synergies with Taiyo Toyo,
from both a technology and market standpoint, and this can be seen as an ‘ideal’
merger. We will strengthen our company through this merger and generate the
cash flow to make capital and R&D investments in our core business areas, such
as electronics and gas plants. The top managers of both Companies agree that
this merger is the most efficient and effective course of action to accurately
respond to the needs of our users.”

According to Mr. William J. Kroll, President and CEO of Matheson Tri-Gas, Inc.,
“This is a very important event for Matheson Tri-Gas, Inc. This merger will
create a new entity that will help us compete much more effectively on the global
stage. Matheson Tri-Gas, Inc., is Nippon Sanso’s largest subsidiary and we will
play a significant role in the consolidated management of this new Company,
contributing a strong brand name, technology and products. We will have new
opportunities to expand our product portfolio, as well as become a significant
supplier of products to the new Nissan Taiyo Corporation.”

About Nippon Sanso Corporation
Founded in 1910, Nippon Sanso is a pioneer in the supply of industrial gases
in Japan, and has made a valuable contribution to the development of many industries,
constantly remaining at the forefront of its own industrial sector. Nippon Sanso
Corporation purchased Matheson Gas Products (now Matheson Tri-Gas, Inc.) in
1983. For more information, please visit: http://www.sanso.co.jp/jp/index.html.

About Taiyo Toyo Sanso Co., Ltd.
Taiyo Toyo Sanso was established in 1946 under the name of Taiyo Sanso Co.,
Ltd., since when it has expanded its business in line with the growth in demand
for industrial gases. The present company came into being in 1995 with the merger
with Toyo Sanso Co., Ltd. The Company has recently achieved rapid growth through
the takeover of the industrial gas operations carried out by subsidiaries of
Mitsubishi Chemical Corporation. For more information, please visit: http://www.saan.co.jp/english/index.html

About Matheson Tri-Gas, Inc.
Matheson Tri-Gas, Inc., is a single source provider of specialty gases,
bulk gases, gas handling equipment, and high performance purification systems.
The Company also provides support services, engineering services, and systems
management services to analytical laboratories and semiconductor manufacturers
worldwide. As a member of the Nippon Sanso Corporation Group, Matheson Tri-Gas,
Inc., is part of a worldwide industrial gas organization focusing on being the
single source provider for global customer requirements. Nissan is a trademark
of Nippon Sanso Corporation. Nissan Motors has a royalty free license from Nippon
Sanso Corporation to use the Nissan name. Visit our Web site @ www.mathesontrigas.com;
email: info@matheson-trigas.com or call 215-648-4000.

Press Contacts:
Beth Sullivan, Marketing Communication Specialist
Matheson Tri-Gas, Inc. Matheson Tri-Gas, Inc.
bsullivan@matheson-trigas.com
+1 215 648-4026

Christine K. Scully, Marketing Communications Manager
Matheson Tri-Gas, Inc.
christine.scully@verizon.net
+1 201 825-1331