Alternative MINERV PHA - bio-based plastics MINERV-PHA is a high-performance PHA biopolymer. Polyhydroxyalkanoate (PHA), a linear polyester naturally occurring as a result of bacterial fermentation of sugar. This family can bring together more than 100 differing monomers to produce materials whose properties vary very greatly. Thermoplastic or elastomeric materials can be created with melting points ranging from 40 to more than 180°C.