Sublime Systems | 21,088 followers on LinkedIn. Clean cement for a resilient future | Sublime Systems is leading a swift and massive transition to a clean cement manufacturing future. Sublime’s breakthrough electrochemical process avoids the pollution caused by ordinary portland cement’s use of fossil-fueled kilns and limestone feedstock. Sublime instead extracts reactive calcium and silicates from abundant raw materials at ambient temperature, to make ASTM C1157-compliant Sublime Cement™, a 1:1 replacement for OPC in concrete.