Sealant Transfer System (STS):
Here, the workload is loaded into the autoclave with the sealant in an adjacent tank. After the vacuum has been drawn on the autoclave, a valve is opened and the sealant transfers into the autoclave, immersing the components. The vacuum is then released, forcing the sealant into the porosity, after which unused sealant returns to its original tank under vacuum. STS machines are simpler to automate and benefit from well-conditioned sealant due to the length of time the sealant is held under vacuum. For critical applications, a pressure autoclave can be supplied, enabling a pressure cycle to be incorporated following the vacuum phase.