Nasdaq- and JSE-listed advanced materials company ASP Isotopes (ASPI) says oil and gas producer Tetra4 has entered into a contract for the sale of liquefied natural gas (LNG) to be produced at the Virginia gas project in the Free State. The LNG sale and purchase agreement is a five-year, take-or-pay contract with a South African food processor, and this offtake represents about 10% of the project's Phase 1 nameplate capacity.