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Pharmaceutical solutions


The EXPANSORB® PLA PEG are belonging to the EXPANSORB® bioresorbable polymers (PLA, PLGA, PCL) product line. In the case of PLA PEG, poly(lactic acid) chain termination is made of PEG 5000.
Such copolymers are used as functional excipients for controlled and slow drug release (weeks to months) with a single injection. Those copolymers are also used for bioresorbable medical materials and devices.
EXPANSORB® products show highly tunable properties within several parameters (monomer ratio, enantiomeric ratio, copolymers, chain termination, Inherent Viscosity/Mw...) that can be adjusted to your needs, even further existing catalog grades.
Seqens can provide small or bulk quantities for PLA/PLGA/PCL ± PEG polymers over 50 references & 2 grades : classic and ultrapure LMP (check our catalog for more details).
With a R&D team onsite dedicated to GMP polymers and a long term expertise, SEQENS will be your partner on each step of your EXPANSORB containing formulation development, from screening to manufacturing material enclosed into your commercial application, with finetuning capabilities up to taylormade solutions and regulatory support.

Technical characteristics

CAS N°:188360-48-7
Empirical formula: [C3H4O2]x[C2H4O]y
State: Solid
Grade(s): Classic, LMP
Sustained release formulations|Encapsulation|Medical devices



  • Poly(ethylene glycol)-block-poly(lactic acid)
  • Poly(ethylene glycol)-block-poly(lactide)
  • lactic acid polyester-block-poly(ethylene oxide)

Johan Rixte, PhD

Drug Delivery Solutions
Business Development Manager