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Why Plastics 12 | Clean Production Action The Plastics Scorecard (Version 1.0) chapter 2 Why Plastics he image of plastics and the environ- into the tissues of aquatic organisms. As one ment and human health is a complex scientist has stated “One of the most ubiquitous one. On its surface, the immediate per- and long-lasting recent changes to the surface spective is one of plastic waste. Images of our planet is the accumulation and fragmen- Tof plastic bags caught in trees and vegetation tation of plastics” (Barnes, et al., 2009). across the landscape, gyres of plastics in the It is more challenging to see the role of oceans, whales caught in plastic netting, beaches plastics in polluting people and the planet littered with plastic debris disgorged from the with chemicals of high concern (CoHCs). Much ocean, and skeletal seagull remains filled with smaller than the smallest particles of plastics plastic beads. Plastic waste is a story of the per- found in aquatic organisms, chemicals such as sistence of plastic—powerful polymers resisting phthalates, Bisphenol A (BPA), and brominated the degradation powers of the environment, flame retardants are invisible to the naked eye. enabling them to travel the globe and to wreak Yet plastics play the largest singular role of havoc on humans and wildlife. Increasingly the any material in the global use of hazardous image of plastic waste in aquatic environments chemicals, with sizable impact on human is growing more complex as plastic fragments health and the global environment. collect toxic chemicals onto their surface and This chapter starts by tracking the material as finely degraded bits of plastics find their way flows of fossil fuels into chemicals and on into Photo: © Thinkstockphoto/raeva Figure 2. World Plastics Production, 1950-2012 Evaluating the Chemical Footprint of Plastics | 13 Plastics Scorecard plastics, documenting the sheer volume of raw materials, chemicals, and CoHCs consumed by plastics. The chapter then turns to the human FIGURE 2 World Plastics Production 1950–2012 health and environmental implications of 300 CoHCs in plastics across their life cycle and finishes with leading business initiatives to advance safer chemicals in plastic products. 250 Material Flows—from Fossil Fuels 200 to Chemicals to Plastics Plastics drive the chemicals economy. To the extent that green chemistry is a goal for the 150 chemicals economy, its achievement will only Mtonne occur if plastics are made from inherently less hazardous chemicals. 100 Synthetic plastics are a newcomer to the family of materials manufactured and used by humans. Over the past 70 years, plastics grew 50 from a bit player in the material economy—with less than a million pounds produced globally in 1944—to a material behemoth, with global production at 288 million metric tons or 634 1950 1960 1970 1980 1990 2000 2010 2020 billion pounds in 2012. Figure 2 depicts the Year rapid growth of plastics in the global economy Includes thermoplastics, polyurethanes, thermosets, elastomers, adhesives, following World War II. coatings and sealants and PP-fibers. Not included PET-, PA- and polyacryl-fibers. Producing those 634 billion pounds of plas- Source: Plastics Europe, 2013. tics requires a huge input of resources beginning with fossil fuels. Around 4% of world oil and gas production is used as a feedstock for plastic TABLE 1 Primary Chemicals Consumed by Plastics production and a further 3–4% is used as energy in their manufacture (Hopewell, et al., 2009). Total Global Consumed Consumption— Consumed by Plastics From the crude oil and natural gas come chemi- Primary All End Uses by Plastics (million metric cals, many of which are CoHCs to human health Chemicals (million metric tons) (%) tons) or the environment. These chemicals in turn a are converted into plastics. The material flow Ethylene 113.18 84% 95.13 for plastics, from crude oil and natural gas, Propylenea 74.90 82% 61.66 to chemicals, to final product is huge (see Xylenesb 42.89 88% 37.62 Table 1 and Figure 3). The plastics manufactured in the greatest Benzenea 39.67 85% 33.52 volume globally are polyethylene,4 polypropylene, Chlorinec 56.21 42% 23.55 polyvinyl chloride (PVC), polyethylene tere- phthalate (PET), polystyrene, acrylonitrile Butadienea 9.28 94% 8.75 butadiene styrene (ABS), and polycarbonate. Methanola 41.86 10% 4.19 Together these seven different plastics accounted for 77% of total global production in 2012 or Total 377.99 70% 264.41 “Primary chemicals” are the building block chemicals used to manufacture plastics and other chemicals. a. 2008 data, b. 2009 data, c. 2010 data 4 Plastics manufacturers produce three different grades Source: Chemical Economics Handbook, articles (a), (d), (e), (i), (j), (r), (s). of polyethylene: high density polyethylene (HDPE), linear low density polyethylene (LLDPE), and low density polyethylene (LDPE). 14 | Clean Production Action The Plastics Scorecard (Version 1.0) FIGURE 3 Global Production of Plastics (2012) Polyethylene (PE) 78.07 million metric tons Polyvinyl Chloride (PVC) 27% 37.98 million metric tons Polyethylene 13% Terephthalate (PET) 18.99 million metric tons Acrylonitrile 7% Butadiene Styrene (ABS) 8.44 million metric tons 3% Polypropylene (PP) 52.75 million metric tons Polycarbonate (PC) 18% 4.22 million metric tons 1% Polystyrene (PS) Miscellaneous Other Plastics 10.55 million metric tons 77.00 million metric tons 4% 27% Total = 288 Million Metric Tons Sources: Plastics Europe, 2013; Sagel, 2012. 211 million metric tons; with the remaining FIGURE 4 Steps in Manufacturing 23% or 77 million metric tons spread across a Plastic Product miscellaneous other plastics such as nylon, polyurethane, silicone, and styrene butadiene Polymer Manufacturing rubber (see Figure 3). The production of plastics involves a series of steps that begin with fossil fuels (see Figure 4). Primary While fossil fuels are the dominant raw material Chemicals Production resource for plastics, manufacturers can also use biobased resources to produce plastics including Intermediate Chemicals Production corn, sugar cane, algae, waste methane from landfills, etc. The potential of using various bio- Monomer(s) Production based resources for manufacturing chemicals for plastics are as diverse as our ecosystems. From fossil fuels the next step on the manu- Polymerization facturing journey to plastics is primary chemi- cals—building block chemicals from which many other chemicals are derived. Table 1 lists the Additives primary chemicals as well as the percent con- sumed by plastics. Ethylene, propylene, xylenes, benzene, chlorine, butadiene, and methanol are Polymer building block chemicals. Roughly 70% of annual primary chemical production, or approximately 264 million metric tons of primary chemicals,5 eventually finds its way into plastics. Compounded Plastic Product 5 Note that the data points are for multiple years, thus 264 million metric tons is a rough approximation of chemicals consumed per year in 2008 and 2009. Product Manufacturing Evaluating the Chemical Footprint of Plastics | 15 Plastics Scorecard The next steps in plastics production after Table 3.7 Among those CoHCs are well known, primary chemical production (depicted in Figure highly hazardous chemicals, including benzene, 4), are the manufacture of intermediate chemicals, Bisphenol A (BPA), styrene, and vinyl chloride which are converted into monomers, which are monomer (VCM). Note the 244 million metric then linked together into long molecular chains tons or 536 billion pounds is a minimal estimate called polymers. In Figure 4 these steps are as it does not include all the CoHCs used in the rolled up into the circle labeled “polymer manu- manufacture of all plastics, including additives, facturing.” Table 2 details the primary chemicals, as well as the fact that the data are from 2008 intermediate chemicals, and monomers used to and 2009, in the midst of the great recession. manufacture the plastics produced in the great- See Appendix 1 for a detailed list of the health est volumes and highlights in red those chemi- hazards of the chemicals listed in Table 3. cals that are CoHCs.6 Polymers are then mixed (called “compound- Similar to the primary chemicals listed in ing”) with additives to impart the unique proper- Table 1, the volume of chemicals consumed at ties needed in specific products (see Figure 4). each of the other steps in polymer manufactur- Typical additives include flame retardants, ing—intermediate chemicals and monomers— plasticizers, antioxidants, antistatic agents, and is hundreds of millions of metric tons per year colorants. Plastic compounding is the process globally. Of the CoHCs consumed in the steps of mixing or blending polymers and additives of polymer manufacturing, plastics consume in a molten state to achieve desired properties. 90% of those chemical markets or approximately Once all processing steps are complete, the 244 million metric tons per year as detailed in material is cooled and extruded into pellets, 6 The Plastics Scorecard uses the same criteria as BizNGO (2008) for defining chemicals of high concern. 7 Note that the data points are for multiple years, thus 244 million metric tons is a rough approximation of chemicals consumed per year in 2008 and 2009. Given those were recession years, this is a lower estimate of total consumption of CoHCs by plastics. Photo: © Thinkstockphoto/06photo 16 | Clean Production Action The Plastics Scorecard (Version 1.0) TABLE 2 Plastics and the Chemicals they Consume Steps in Polymer Manufacturing
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