2. Manufacturing
High-density polyethylene is obtained by low-pressure ethylene polymerization processes, either alone or with comonomers.
The first production units date back to the mid-1950s. In 1955, Hoechst started up the first unit based on Ziegler-Natta catalysis, followed in 1956 by Phillips Petroleum and its industrial reactor employing a chromium catalyst.
In the 1960s, improvements were made to the Ziegler process with the use of super-active catalysts, eliminating the need for costly catalytic residue removal. Subsequently, new processes were developed, such as gas-phase polymerization and particle-form processes.
In the 1990s, the use of serial polymerization reactors enabled the synthesis of bimodal PE-HD,...
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NF 388 mark – Plastic tanks used for unburied storage of domestic heating oil.
NF 114 mark – Polyethylene pipes for combustible gas distribution networks, drinking water distribution networks, irrigation and industrial applications, non-drinking water and pressurized wastewater systems.
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