; and Somerville , N. For more
information, visit, www. SmartSilver-enhanced fabrics and fibers are sold exclusively
under the E47(TM) brand name and are only available through ARC Technologies.com.

Media Contacts:
Nicolas A.

fothergill porvair

The transaction, which is subject to regulatory
approvals, is expected to close within the next 30 days. Black Clawson is owned by
Hamilton Robinson LLC, a private equity investor.cromptoncorp. These
statements are based on Crompton's estimates and assumptions and on
currently available information. SmartSilver permanently bonds
to host materials, ensuring "like new" anti-odor performance for the life of
the product.
Of utmost importance to fabric and apparel designers, SmartSilver does not
alter stretch, wicking, hand, or dyeability of fibers and fabrics, enabling
designers to add permanent and effective anti-odor properties to their
favorite fabrics and fibers.
For all other applications, call Dennis Schneider, NanoHorizons, 814-689 -
1578, dschneider@nanohorizons.com

fibermark shawmut

"
Robert Ackley, president of Davis-Standard, said , "The combination
with Black Clawson presents an excellent opportunity to increase the
productivity and profitability of our customers worldwide.; as well as in
Germany and the UK. SmartSilver-modified fibers can be used to create odor-
resistant shoe linings, T-shirts, socks, gloves, carpets and more . In addition, NanoHorizons plans to deploy SmartSilver 500
formulas for medical-grade applications later this year.com.

sude wovens

"This industry has not yet recovered from the worst cyclical
downturn in recent history. Some of the markets served include flexible
packaging, tapes, labels, marking films, imaging media, pre-coated
consumer and industrial products and resin production.Permanent, Effective and Safe Nanoscale Additives Include Nylon, Polyurethane,
Polyester, Cotton

STATE COLLEGE, Penn. Silver-coated
fibers are expensive, difficult to use, and shed silver flakes, reducing
effectiveness and creating potential effluent problems. So-called "nano-
silver " powders clog extruding spinnerets, do not bond to polymers or cotton,
and generate airborne silver dust.com.

vetex sude

, will combine
Crompton's Davis-Standard business and Hamilton Robinson's Black
Clawson Converting Machinery Company (BCCM) and will have approximate
annual revenues of $220 million with Crompton as the majority owner. NanoHorizons' Quality Assurance Program requires submission
of samples from every fiber and fabric batch -- each batch is laboratory
tested to ensure that it meets the required levels of performance.

scrim coating

D-S LLC, headquartered in Pawcatuck, Conn. It
employs approximately 150 people, substantially all of whom will also
become D-S LLC employees after closing.

About Crompton Corporation

Crompton Corporation, with annual sales of $2. Yet using silver has always
posed challenges of cost, permanence and manufacturability. Burlinson, NanoHorizons' President and CEO. Please call Bill Douglas, ARC, 877-974-
4353, bdouglas@arcoutdoors.com.

vetex laminating

The joint venture will be classified in Crompton's financials as an
equity investment. Given industry dynamics, we believe it is
in the best interests of our shareholders for us to partner with a
capable operator such as Black Clawson/Hamilton Robinson in order to
leverage the benefits of industry consolidation .Y. Davis-Standard extrusion machines are used primarily for the
packaging, automotive, construction and medical industries.
Customers also produce items such as medical tubing, plastic bags,
roof membranes, fencing and decking materials, footwear, sanitary
products and specific tire components .
"From sporting goods to carpets and upholstery, SmartSilver enables
manufacturers to safely and easily incorporate permanent anti-
odor/antimicrobial benefits at an exceptionally low cost."

For Further Information
SmartSilver for fiber and fabric applications is sold exclusively through
ARC, maker of E47 fibers and fabrics.

coating masureel

The business employs approximately 660 people,
substantially all of whom will become D-S LLC employees after closing.

SmartSilver 100 is designed to
offer 100% of the performance of any comparable permanent silver-based
solution. The company's research
and development team addresses real-world problems with applied nanoscale
engineering .

polycom retardent

The forward-looking statements
include information concerning our possible or assumed future results
of operations, and Crompton's actual results may differ significantly
from the results discussed .
SmartSilver material modifications are permanent, safe, exceptionally low-cost
and fully compatible with existing manufacturing processes for fiber, fabric,
and coated products.
Coating and solids applications of SmartSilver are available directly from
NanoHorizons.
Existing manufacturing processes adapt easily and reliably to SmartSilver
-- and its fundamental design virtually eliminates the potential for
manufacturing safety and effluent problems. To learn more about NanoHorizons,
please visit http://www.nanohorizons.

lintec scrim

Product lines include equipment for extrusion
coating and laminating , cast film production, liquid coating and
laminating, unwinding and winding and pelletizing; all supported by BC
Encompass services. NanoHorizons' products and application introductions include:
SmartSilver(TM) and other commercially available nanoparticle-based additives;
E47(TM) antimicrobial fibers; QuickMass(TM), which addresses the need for more
cost-effective pharmaceutical research and increased drug discovery capacity;
the Postflex process for flexible displays, circuits and sensors on plastic;
and, nano-materials for sensors for environmental control and medical
applications and solar cell technology.

breathable tortella

"
Mark Panozzo, president of Black Clawson, added, "Our objective
for the new company is to focus on increasing customer value through
improved product technology, global reach and enhanced local service
and support., facility.com

About Davis-Standard

Davis -Standard is a world leader in the manufacture and supply of
rubber and plastics extrusion equipment and industrial blow-molding
machines.
814-689-1578
dschneider@nanohorizons.

fothergill flocking

Forward -looking information is intended to
reflect opinions as of the date this release was issued and such
information will not necessarily be updated by Crompton. Boillot
Hart-Boillot, LLC
781-893-0053
nboillot@hartboillot.

breathable vetex

Business Editors/Chemicals Writers

MIDDLEBURY , Conn.com

About Black Clawson

Black Clawson Converting Machinery, Inc. Providing a natural and far safer alternative, silver has been
the ideal permanent antimicrobial since antiquity.
"SmartSilver's mandatory laboratory testing ensures consistent anti-odor
performance.

compensators fothergill

"
"Our SmartSilver nanoscale-engineered antimicrobial additives enable a new
generation of consumer and industrial products with permanent, effective anti-
odor properties," said Robert F. For inquiries related to E47(TM)
antimicrobial fibers and fabrics based on nanoscale-engineered additives from
NanoHorizons, please contact ARC Outdoors at 877-974-4353 or
http://www.

liong windproof

designs and manufactures
a wide range of equipment for the flexible web converting and plastics
processing industries.

NanoHorizons(TM) Expands SmartSilver(TM) Anti-Odor/Antimicrobial Additives Line and Introduces Quality Assurance Program

Three Strengths for a Wide Range of Applications
NanoHorizons provides manufacturers with specific formulas for achieving
their desired level of anti-odor performance .

compensators tortella

+ STAMFORD, Conn., NanoHorizons(TM), Inc.

SmartSilver Quality Assurance Program
NanoHorizons requires all manufacturers using SmartSilver to utilize
authorized formulas that deliver assured levels of anti-odor effectiveness in
the end product.

About NanoHorizons, Inc .com

Dennis I.

retardent fibermark

"Our interests are very aligned with those of our partner -
combining resources to capture synergies and achieve immediate
performance improvement," said Crompton Chairman and CEO Robert L. NanoHorizons is the only manufacturer of antimicrobial additives to
define standards of performance and mandatory ongoing manufacturer quality
monitoring. Schneider
NanoHorizons , Inc.

breathable saturation

Included in the joint venture are
facilities in Pawcatuck, Conn. For more information, visit
www.

fibermark shawmut

Wood."
Crompton's Davis-Standard business had 2004 revenues of
approximately $180 million .5 billion, is a
producer and marketer of specialty chemicals and polymer products and
equipment . SmartSilver standards for
effectiveness and a comprehensive Quality Assurance Program were also
announced. SmartSilver 200 is targeted at applications demanding far stronger
anti-odor properties , such as sock-less running shoe liners, skates or ski-
boot linings.

compensators tortella

Black Clawson will contribute its Fulton, N. For more information, visit
www.e47nano.

fothergill reactivated

today
announced new additives for urethane and nylon, adding new nanoscale materials
to its existing SmartSilver(TM) line of permanent anti -odor/antimicrobial
additives for polyester and 100% cotton. From the manufacturing perspective, SmartSilver requires no
alteration to equipment or processes.
NanoHorizons, Inc.

This category lists companies involved with industrial coating and lamination of textile and nonwoven fabrics.

fibermark fothergill

Joining
forces will enable both companies to more efficiently allocate
resources with regard to technology, delivery , commissioning,
emergency service, customer support, research and development.davis-standard.bcconverting .com

Forward-Looking Statement

Certain statements made in this release are forward-looking
statements that involve risks and uncertainties, including, but not
limited to, general economic conditions, the outcome and timing of
antitrust investigations and related civil lawsuits to which Crompton
is subject, the ability to obtain selling price increases, pension and
other post-retirement benefit plan assumptions, energy and raw
material prices and availability, production capacity, changes in
interest rates and foreign currency exchange rates, changes in
technology, market demand and customer requirements, the enactment of
more stringent environmental laws and regulations, the ability to
realize expected cost savings under Crompton's cost reduction
initiatives, the amount of any additional earn-out payments from GE,
the ability to successfully integrate Davis-Standard and Black Clawson
into a joint venture, the success of the management group from Black
Clawson in managing the joint venture, the ability to reduce
Crompton's debt levels, and other risks and uncertainties detailed in
Crompton's filings with the Securities and Exchange Commission.
SmartSilver imparts new anti-odor/antimicrobial capabilities to target
materials through enhancements that take place at the molecular level. Urethane
applications include rainwear, upholstery, paints, caulks and other coatings
for which SmartSilver adds odor-resistance as well as resistance to mildew and
mold growth .
"With SmartSilver, we now can offer permanent, integrated anti-odor
properties for nearly any fabric," said JT Griffin, President and CEO, ARC.

polycom masureel

----March 31,
2005--Crompton Corporation (NYSE: CK) and Hamilton Robinson LLC, a
private equity firm, today announced that they have signed a
definitive agreement to form a joint venture called Davis-Standard LLC
(D-S LLC), combining their respective polymer processing equipment
businesses.com

About Hamilton Robinson LLC

Hamilton Robinson LLC is a leading middle-market private equity
investor which since 1984 has successfully backed independent
management teams in manufacturing, service, and media businesses
throughout North American and Europe. ARC
will be exhibiting at the Outdoor Retailer Winter Market (Booth 4107), January
28 -31, in Salt Lake City.
Engineered at the nanoscale to overcome these challenges, SmartSilver
enables manufacturers to immediately and inexpensively add permanent anti-
odor/antimicrobial properties to their products.

scrim flocking

Crompton and Hamilton Robinson to Form Polymer Processing Equipment Joint Venture

J.hrco.

SmartSilver Solves Real Market Challenges
Many non-permanent antimicrobial chemicals require special handling due to
their toxicity. focuses on nanotechnology applications in the fiber and
textile, healthcare and microelectronics industries.

coating shawmut

Additional information concerning Crompton Corporation is
available at www. Its
customers are processors of extruded products, including plastic sheet
and profiles used in appliances, cars, sports equipment and furniture.
ARC's E47 is available in a wide range of standard and custom fabrics, and is
supported by a comprehensive branding, marketing, and licensing program.

windproof reactivated

---

- - kjjkjk

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