Metabolix to Present Advances in Biopolymer Technology at ANTEC Conference

  Metabolix to Present Advances in Biopolymer Technology at ANTEC Conference

   Significant New Data Demonstrating that Biobased PHA Polymeric Modifiers
                      Improve Performance of PLA and PVC

Business Wire

CAMBRIDGE, Mass. -- April 22, 2013

Metabolix, Inc. (NASDAQ: MBLX), an innovation-driven bioscience company
focused on delivering sustainable solutions for plastics, chemicals and
energy, today announced that its researchers will make technical presentations
at the ANTEC Conference being held April 22-25 in Cincinnati, Ohio. Metabolix
researchers will present new data showing that its biobased PHA
(polyhydroxyalkanoate) copolymers significantly improve the mechanical,
performance and environmental characteristics of the commercially significant
polymers polylactide (PLA) and polyvinyl chloride (PVC).

“The demand for application specific products is an important trend in the
biopolymers market and we are actively working to capitalize on it,” said
Richard P. Eno, president and chief executive officer, Metabolix. “Metabolix
continues to drive innovation in the biopolymer market forward with technology
advances that deliver valuable market applications for established industries
across the globe.”

“We are excited to share these test results showcasing the broad applicability
of our PHA biopolymers for synergistically improving the characteristics of
PLA and PVC,” noted Bob Engle, vice president, business development,
biopolymers, Metabolix. “The results detailed in our presentations represent
the recent progression of our research and development activities, and have
the potential for broadening the market opportunity for our biopolymers
business.”

Overview of Metabolix Presentations at ANTEC:

“Impact Modification of PLA using Biobased, Biodegradable Mirel PHB
Copolymers”

Monday, April 22 at 9:00 a.m., Session M1 Bioplastics, Room 230

Allen Padwa will present data highlighting the use of Mirel PHB copolymers to
improve the impact toughness of PLA without compromising the biobased carbon
content and compostability of PLA. The results show that PHA can be blended
with PLA to achieve a 20-fold increase in impact strength with modest
decreases in tensile modulus. The balance of properties achieved with the
blend rivals the performance of established engineering resins. The phase
morphology and structure-property relationships of PLA/PHA blends will be
discussed in the presentation.

“Modification of PVC with Biobased PHA Rubber, Part 2”

Tuesday, April 23 at 9:30 a.m., Session T16, Room 202

Yelena Kann, Ph.D., will present new data on the use of PHA polymeric
modifiers to improve the mechanical and environmental performance of PVC. The
presentation will describe the miscibility of PHA polymeric modifiers and
their effect on plasticization, impact modification and flow promotion in
flexible and semi-rigid PVC. In addition, data showing the resistance of PHA
modified PVC to fungal growth, weatherization and biodegradation as compared
to controls will be presented. Dr. Kann will also provide an overview of
ongoing research in the use of PHA polymeric modifiers to improve rigid PVC
formulations.

You can find more information about Metabolix’s ANTEC presentations here.

About Metabolix

Metabolix, Inc. is an innovation-driven bioscience company delivering
sustainable solutions to the plastics, chemicals and energy industries.
Metabolix is developing and commercializing a family of high-performance
biopolymers targeted to the markets for film and bag applications, performance
additives and functional biodegradation. Metabolix’s biobased chemicals
platform utilizes its novel “FAST” recovery process to enable the production
of cost-effective, “drop-in” replacements for petroleum-based industrial
chemicals. Metabolix is also developing a platform for co-producing plastics,
chemicals and energy from crops. Metabolix has established an industry-leading
intellectual property portfolio that, together with its knowledge of advanced
industrial practice, provides a foundation for industry collaborations.

For more information, please visit www.metabolix.com. (MBLX-G)

Safe Harbor for Forward-Looking Statements

This press release contains forward-looking statements which are made pursuant
to the safe harbor provisions of Section 27A of the Securities Act of 1933, as
amended, and Section 21E of the Securities Exchange Act of 1934, as amended.
The forward-looking statements in this release do not constitute guarantees of
future performance. Investors are cautioned that statements in this press
release which are not strictly historical statements, including, without
limitation, statements regarding the market potential for Metabolix
biopolymers, constitute forward-looking statements. Such forward-looking
statements are subject to a number of risks and uncertainties that could cause
actual results to differ materially from those anticipated and are detailed in
Metabolix's filings with the Securities and Exchange Commission. Metabolix
assumes no obligation to update any forward-looking information contained in
this press release or with respect to the announcements described herein.

Contact:

Media, Investor and General Inquiries:
Lynne H. Brum, 617-682-4693
LBrum@metabolix.com
or
Media Inquiries:
Schwartz MSL Boston
Keith Giannini or Kirsten Swenson, 781-684-0770
metabolix@schwartzmsl.com