Ecoflex is a biodegradable aliphatic-aromatic copolyester which was developed using BASF polyester technology. Ecoflex was designed mainly for inflation and extrusion applications, and the mechanical properties are on par with low density polyethylene. Because Ecoflex has such high flexibility and high tear resistance, Ecoflex can be blended with other biodegradable resins to impart high flexibility, shock resistance and water resistance to these resins.

Unlike other biodegradable resins, because Ecoflex is resistant to hydrolysis, preliminary drying is unnecessary when molding. The density of Ecoflex is 1.25g/cm3 which is 35% more than LDPE, but it is about the same level as other polyester resins. The molding temperature is 140 -160°C in inflation and this is lower than LDPE (190 -220°C). The shore hardness and Vicat softening point are lower than those of LDPE. The melting point of both resins is 110 -115°C.

Even when no additives are included in Ecoflex, transparency is lower than LDPE. Tensile strength and elongation are higher than LDPE. Shock strength is much higher than LDPE. Tear strength and pierce strength are at a much higher level than LDPE.

Oxygen permeation rate in Ecoflex is about 60% of that of LDPE. However water vapor permeation rate is considerably higher than that of LDPE. One reason for this is that Ecoflex has higher polarity than LDPE.