Bisphenol A
A widely used industrial chemical with debated health effects.
Bisphenol A (BPA) is a synthetic compound best known for its role in plastic production. This colorless solid dissolves easily in many organic solvents but barely mixes with water. It is made industrially by reacting phenol with acetone, a process that generated roughly 10 million tonnes worldwide in 2022. The majority of BPA—between 65 and 70 percent—goes into making polycarbonate plastics as a co-monomer. Another 25 to 30 percent is used to produce epoxy resins and vinyl ester resins. The remaining 5 percent appears in high-performance plastics and as a minor additive in materials like PVC, polyurethane, and thermal paper. Though often mistaken for one, BPA is not a plasticizer.
BPA’s health effects have sparked long-running debate among scientists and the public. It acts as a xenoestrogen, meaning it can weakly mimic the hormone estrogen in the body. While this effect is faint, the widespread presence of BPA in everyday items means people are exposed throughout their lives. Many of these items are not obvious: linings inside food cans, clothing components, store receipts, dental fillings, and coatings for water pipe repairs. Public health agencies worldwide, including the World Health Organization, have investigated it. Typical exposure levels fall below what is currently considered risky, but some governments have taken precautionary steps—notably banning BPA from baby bottles. Evidence suggests this has lowered infant exposure. So-called BPA-free plastics, made with alternatives like bisphenol S or bisphenol F, have emerged, though their safety is also debated.
The compound was first described in 1891 by Russian chemist Aleksandr Dianin. In 1934, researchers at I.G. Farbenindustrie combined BPA with epichlorohydrin, and over the next decade, companies in Switzerland and the United States developed related coatings and resins. This work led to epoxy resins, which boosted BPA production. Later, discoveries at Bayer and General Electric produced polycarbonate plastics, which first hit the market in 1958 through Mobay, General Electric, and Bayer. In the early 1930s, British biochemist Edward Charles Dodds tested BPA as an artificial estrogen, finding it bound to estrogen receptors tens of thousands of times more weakly than estradiol. He later created a similar compound, diethylstilbestrol (DES), used as a synthetic estrogen until it was banned in humans
- first_reported
- 1891
- first_reported_by
- Aleksandr Dianin
- global_production_2022
- 10 million tonnes
- major_use
- Polycarbonate production (65–70%)
- chemical_class
- Xenoestrogen
- common_alternatives
- Bisphenol S, Bisphenol F
Lore & Background
Bisphenol A was first reported in 1891 by the Russian chemist Aleksandr Dianin. In 1934, workers at I.G. Farbenindustrie reported the coupling of BPA and epichlorohydrin. Over the following decade, coatings and resins derived from similar materials were described by workers at the companies of DeTrey Freres in Switzerland and DeVoe and Raynolds in the US. This early work underpinned the development of epoxy resins, which in turn motivated production of BPA. The utilization of BPA further expanded with discoveries at Bayer and General Electric on polycarbonate plastics, which first appeared in 1958, being produced by Mobay, General Electric, and Bayer. The British biochemist Edward Charles Dodds tested BPA as an artificial estrogen in the early 1930s, finding it bound to estrogen receptors tens of thousands of times more weakly than estradiol. Dodds eventually developed a structurally similar compound, diethylstilbestrol (DES), which was used as a synthetic estrogen drug until banned due to cancer risk; BPA was never used as a drug.
Reader's Guide
Bisphenol A is significant as one of the highest-volume chemicals produced globally, with an estimated 10 million tonnes manufactured in 2022. Its primary use in polycarbonate plastics and epoxy resins makes it pervasive in modern life, appearing in items such as food can linings, dental fillings, shop receipts, and water pipe linings. The health debate surrounding BPA stems from its weak estrogenic activity, raising concerns about lifelong exposure. While normal exposure is below levels currently associated with risk, several jurisdictions have banned BPA from baby bottles on a precautionary basis, with some evidence of reduced infant exposure. BPA-free alternatives using bisphenol S or bisphenol F have been introduced, but their safety remains controversial. The compound's synthesis, still following Dianin's original method, is considered an example of green chemistry due to high atom economy and water as the only by-product. Its legacy is thus a tension between industrial utility and public health precaution.
Did You Know?
- Bisphenol A was first reported in 1891 by Russian chemist Aleksandr Dianin.
- BPA is not a plasticizer, although it is often wrongly labelled as such.
- BPA has been investigated by public health agencies in many countries, as well as by the World Health Organization.
- BPA-free plastics are manufactured using alternative bisphenols such as bisphenol S and bisphenol F, but there is controversy around whether these are actually safer.
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