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A water bottle. Worldwide, 480 billions of plastic drinking bottles were sold in 2017 (and fewer than half were recycled).
Plastic was invented in the 19th century and was originally used to replace common materials such as ivory, rubber, and shellac. They were first used commercially in 1947 but remained relatively expensive until the early 1950s when high-density polyethylene was introduced. They quickly became popular with both manufacturers and customers because of their lightweight nature, relatively low production, and transportation costs compared to glass bottles. However, the biggest advantage plastic bottles have over their glass counterparts is their superior resistance to breakage, in both production and transportation. Except for wine and beer, the food industry has almost completely replaced glass bottles with plastic bottles.
HDPE is the most widely used resin for plastic bottles. This material is economical, impact resistant, and provides a good moisture barrier. HDPE is compatible with a wide range of products including acids and caustics but is not compatible with solvents. It is supplied in FDA-approved food grade. HDPE is naturally translucent and flexible. The addition of color will make HDPE opaque, but not glossy. HDPE lends itself to silk screen decoration. While HDPE provides good protection at below freezing temperatures, it cannot be used with products filled above 190 °F (88 °C) or products requiring a hermetic (vacuum) seal.
These bottles are exposed to fluorine gas in a secondary operation, are similar in appearance to HDPE, and serve as a barrier to hydrocarbons and aromatic solvents. Fluorine-treated bottles may contain insecticides, pesticides, herbicides, photographic chemicals, agricultural chemicals, household and industrial cleaners, electronic chemicals, medical cleaners and solvents, citrus products, d-limonene, flavors, fragrances, essential oils, surfactants, polishes, additives, graffiti cleaning products, pre-emergents, stone and tile care products, waxes, paint thinner, gasoline, biodiesel, xylene, acetone, kerosene and more.
LDPE is similar in composition to HDPE. It is less rigid and generally less chemically resistant than HDPE, but is more translucent. LDPE is used primarily for squeeze applications. LDPE is significantly more expensive than HDPE.
This resin is commonly used for carbonated beverages, water bottles, and food packaging. PET provides very good alcohol and essential oil barrier properties, generally good chemical resistance (although acetones and ketones will attack PET), and a high degree of impact resistance and tensile strength. The orienting process serves to improve gas and moisture barrier properties and impact strength. This material is not resistant at high temperature. Its maximum temperature is 200 °F (93 °C).
PP is used primarily for jars and closures. It is rigid and is a barrier to moisture. Polypropylene is stable at temperatures up to 220 °F (104 °C). It is autoclavable and offers the potential for steam sterilization. The compatibility of PP with high filling temperatures is responsible for its use with hot fill products. PP has excellent chemical resistance, but provides poor impact resistance in cold temperatures.
PS is transparent and rigid. It is commonly used with dry products, including vitamins, petroleum jellies, and spices. Styrene does not provide good barrier properties, and exhibits poor impact resistance.
PVC is naturally clear. It has high resistance to oils, and has transmits very little oxygen. It provides a strong barrier to most gases, and its drop-impact resistance is also very good. This material is chemically resistant, but it is vulnerable to some solvents. PVC has poor resistance to high temperatures and will distort at 160 °F (71 °C), making it incompatible with hot-filled products. It has attained notoriety in recent years due to potential health risks.
Post-consumer resin (PCR)
PCR is a blend of reclaimed natural HDPE (primarily from milk and water containers) and virgin resin. The recycled material is cleaned, ground and recompounded into uniform pellets along with prime virgin material especially designed to build up environmental stress crack resistance. PCR has no odor but exhibits a slight yellow tint in its natural state. This tint can be hidden by the addition of color. PCR is easily processed and inexpensive. However, it cannot come into direct contact with food or pharmaceutical products. PCR can be produced in a variety of recycled content percentages up to 100%.
SBC is a highly transparent, high-gloss, impact-resistance resin. K-Resin, a styrene derivative, is processed on polyethylene equipment. It is specifically incompatible with fats and unsaturated oils or solvents. This material is frequently used for display and point-of-purchase packaging.
A bioplastic is a polymer structure based on processed biological materials rather than petrochemicals. Bioplastics are commonly made from renewable sources like starch, vegetable oil, and less commonly, chicken feathers. The idea behind bioplastic is to create a plastic that has the ability to biodegrade.
BPA is a synthetic compound that serves as a raw material in the manufacturing of such plastics as polycarbonates and epoxy resins. It is commonly found in reusable drink containers, food storage containers, canned foods, children's toys and cash register receipts. BPA can seep into food or beverages from containers that are made with BPA.
In the United States, plastic water bottles are regulated by the FDA which also inspects and samples bottled water plants periodically. Plastic water bottle plants hold a low priority for inspection due to a continuously good safety record. In the past, the FDA maintained that there was a lack of human data showing plastics pose health problems. However, in January 2010, the FDA reversed its opinion saying they now have concerns about health risks. An article published on 6 November 2017 in Water Research reported on the content of microplastics in mineral waters packed in plastic or glass bottles, or beverage cartons. In 2018, research conducted by Sherri Mason from the State University of New York in Fredonia revealed the presence of polypropylene, polystyrene, nylon and polyethylene terephthalate microparticles in plastic bottles. Polypropylene was hereby found to be the most common polymeric material (54%) and nylon the second most abundant (16%) polymeric material. The study also mentioned that polypropylene and polyethylene are polymers that are often used to make plastic bottle caps. Also, 4% of retrieved plastic particles were found to have signatures of industrial lubricants coating the polymer. The research was reviewed by Andrew Mayes of the University of East Anglia (UEA) School of ChemistryThe European Food Safety Authority suggested most microplastics are excreted by the body, however the UN Food and Agriculture Organization warned that it is possible that the smallest particles (< 1.5 ?m) could enter the bloodstream and organs, via the intestinal wall.
^Schymanski, Darena; Goldbeck, Christophe; Humpf, Hans-Ulrich; Fürst, Peter (2018). "Analysis of microplastics in water by micro-Raman spectroscopy: Release of plastic particles from different packaging into mineral water". Water Research. 129: 154-162. doi:10.1016/j.watres.2017.11.011. ISSN0043-1354. PMID29145085.