BioSpan® Segmented Polyether Urethane
BioSpan© materials are available in dimethylacetamide (DMAc) solution, suitable for fabrication processes such as casting, dipping, spinning, and spraying. When preparing films or components from BioSpan® solution, PTG recommends heating the immediate work area to 30-35 °C (86-95 °F) with HEPA-filtered air and adequate ventilation. The elevated temperature is required because DMAc is a hygroscopic solvent and will pick up moisture at room temperature, resulting in a poor quality part. Dry the part in an oven at 60 °C (140 °F) to remove the remaining solvent after the bulk of the solvent has evaporated (20-60 minutes). The oven drying time will vary depending on the dimensions of the part. A final water extraction or multiple extractions may remove trace DMAc. Perform this water extraction at 60 °C for 24 hours or longer, depending on sample thickness. If possible, the entire contents of a container should be used at one time. If less than the entire contents of a container are used, make sure the solution is handled in a clean environment and the remainder is stored properly after each usage. The remainder should be stored in a sealed container at < 4°C and could be reused. Alternatively, PTG has the clean room facilities to fabricate devices and device components from BioSpan, according to your specifications.
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