Polyamides and Intermediates

Ultramid® Flex F38


BASF’s New Bio-based Copolyamide Creates New Opportunities for a Circular Economy


Ultramid® Flex F38 is an entirely new bio-based copolyamide. Parts of the raw materials for the monomer are sourced from locally grown rapeseed oil. It has an average bio-based carbon content of 34 %*. Therefore, has lower product carbon footprint compared to PA6 and PA6/6.6.


* Determined by measuring of the 14C/12C and 13C/12C isotopic ratios using accelerator mass spectrometry as described by ASTM D6866. 


The Swiss packaging manufacturer O. Kleiner AG, in collaboration with BASF, has developed an aluminum-free sustainable coffee packaging that uses not only a bio-polyethylene but also the bio-based copolyamide Ultramid® Flex F38. BASF’s polyamide ensures the mechanical stability and puncture resistance of the packaging. The amount of fossil raw materials for the innovative packaging was significantly reduced, thereby significantly reducing CO2 emissions. Ultramid® Flex F 38 makes an important contribution with its high bio-based content of up to 34% canola oil from regional sources. With the help of compensation measures and the use of a bio-polyethylene, the coffee packaging is completely CO2-neutral.



Added Value Solution Combining Sustainability and Performance in Packaging Industry

Thanks to its softness, transparency and excellent impact resistance at lower temperatures, Ultramid® Flex F38 is ideally suited for various food packaging applications, for example, soft vacuum, shrink bags, and low temperature packaging.

Ultramid® Flex F38 film is very soft and flexible, even before conditioning. Due to this increased softness, Ultramid® Flex F38 exhibits outstanding dynamic tear strength without lowering the high puncture resistance, typical of polyamides.


Ultramid® Flex F38 is very clear and transparent even at high thicknesses.


Ultramid® Flex F38 has an increased toughness even at low temperatures (-30 °C). This feature makes it a suitable polyamide to be used in food packaging, kept at low temperatures.


With a CO2 and O2 permeability 15 times higher than in conventional polyamide 6, the new Ultramid® Flex F38 owns considerably changed barrier properties. For example, Ultramid® Flex F38 is ideally suited for use as cheese ripening bags. 


Ultramid® Flex F38 Ideal Solution for a Wide Array of Technical Films


Due to the new comonomer Ultramid® Flex F38 is different from PA 6 or PA6/6.6 in many aspects. For example, it has much lower water uptake, and offers superior HNO3 resistance, compared to PA6 and PA6/6.6. These advantages along with other properties, like excellent zinc chloride resistance, makes it a cost-efficient alternative to long chain aliphatic polyamides, e.g., PA6/12, PA11, PA12.




Ultramid® Flex F38 has a considerably higher melt stability than conventional polyamides, allowing for outstanding bubble stability or higher blow-up ratios. These processing properties enable users to optimize the entire film structure. The material is very soft immediately after processing, even without conditioning, which allows great advantages for film processing at low temperatures and low humidity.