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Vietnam Oil and Gas Group (Vietnamese: Tập đoàn Dầu khí Việt Nam), commonly known as PetroVietnam (PVN; alternatively stylized Petrovietnam or PETROVIETNAM), is the state-owned national oil and gas corporation of Vietnam.
HDPE is known for its high strength-to-density ratio. [4] The density of HDPE ranges from 930 to 970 kg/m 3. [5] Although the density of HDPE is only marginally higher than that of low-density polyethylene, HDPE has little branching, giving it stronger intermolecular forces and tensile strength (38 MPa versus 21 MPa) than LDPE. [6]