Our Antioch plaster process was developed years ago and has been honed for decades by our company. It is suited to produce airflow impellers. Antioch plaster molds can be poured at a low temperature, which allows rapid solidification and leads to high mechanical properties. Once the mold is through processing, it becomes an insulator as opposed to a conductor, so we can fill thin cross-sections and vanes. Parts produced with our Antioch plaster process have a surface finish whose quality far exceeds that of parts produced by more common foundry molding techniques. You can expect 100RMS on most parts produced with this process.