Chlorine and Plastic: Part Two
PVC from China is some of the worst in the world, but it’s being imported into the U.S. at astounding rates. This and other interesting facts are covered in depth in a new study from the Healthy Building Network (HBN).
Chlorine is one of the most common industrial chemicals and is one of the key ingredients used to manufacture PVC, polyurethane, epoxies, and other plastics. But chlorine is extremely reactive and readily forms persistent, bioaccumulative toxic chemicals (PBTs) in the environment, making materials such as PVC—which is approximately 57% chlorine by weight—pariahs in the green building community (see The PVC Debate: A Fresh Look).
HBN detailed the impacts of chlorine production in Africa, the Americas, and Europe in a 2018 report Chlorine and Building Materials: A Global Inventory of Production Technologies, Markets, and Pollution, and has now expanded that research into Asia. With continued financial support from Carnegie, Designtex, Interface, Humanscale, Metroflor, and Tarkett, phase two of HBN’s research covers “an estimated 56% of Asia’s chlorine capacity and 67% of its PVC production capacity in 2017.”
Some of the key findings:
- Chlorine production and consumption via PVC is rising rapidly in Asia, due primarily to China’s urbanization.
- Approximately 94% of Asia’s chlor-alkali facilities (which produce chlorine and sodium hydroxide) use more modern technologies that incorporate per- and polyfluoroalkyl membranes/coatings rather than older asbestos or mercury cell technologies.
- Approximately 83% of the vinyl chloride monomer (the building block of PVC) produced in China uses an acetylene process that consumes coal and a mercury catalyst.
- Approximately 85% of the PVC floor, wall, and ceiling coverings entering the United States in 2017 came from China.
BuildingGreen noted back in 2014 that China’s acetylene VCM process is the world’s largest consumer of mercury. This, combined with the use of coal—the most polluting fossil fuel with the highest carbon output—as fuel and feedstock makes China’s PVC the least environmentally responsible PVC available. HBN’s phase two report explains how PVC products made using this process are being imported into the U.S. It also provides a factory-by-factory assessment of Asia’s chlorine and PVC supply chain, giving manufacturers and building professionals further guidance on the environmental impacts of chlorinated plastics.
More on chlorine and plastics
For more information:
Healthy Building Network
Published April 2, 2019