What is BPA and why is it used in packaging coatings?
Packaging coating for cans is usually based on epoxy or polyester. Both have excellent barrier performance and chemical resistance. The latest formula’s avoid current materials of concern (BPA, melamine, styrene). Bisphenol-A (BPA) is a chemical that has a questionable reputation. Research shows that BPA may pose risks to hormones, human development, prostate effects and even breast cancer. From a technical standpoint, it is challenging to find the right alternatives due to the rigorous performance requirements for the coatings as well as the low price of BPA-epoxy resins. But that does not mean it can’t be done!
BPA coating alternatives
Among all the new resin technologies today, polyesters with a balance of key performance attributes have emerged as one of the most promising alternative solutions. Also a new coating technology derived from soybean oil provides a BPA alternative for beverage and food applications. Tetramethyl bisphenol F (TMBPF) and its final polymer product developed by Valspar (a major paint and resin company), has also shown promising results.
BPA free packaging coating is not always safe
Coating makers have scrambled for BPA alternatives, which quickly made their way into products sporting “BPA free” labels. But, the alternatives can have flaws. Some substitutes—often related chemicals in the bisphenol family—appear to have similar hormone-mimicking properties. Can linings made from other plastics have a shorter shelf life, work only for particular foods and drinks, or require more coatings in the factory.
It can be hard to find a BPA free coating for your packaging. But we we can help you find the right coating specialist to manufacture a resin specifically for your product and budget.
BPA free regulations
Consumer and regulatory pressure to replace bisphenol-A (BPA)-based materials in food contact metal packaging coatings has increased in recent years. BPA is nowadays banned from more and more products and even countries. From baby bottles and toddler cups in Canada, Europe, and the United States to BPA in all food containers in France. Other countries require warning labels or signs for food and drink cans with BPA.