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SCMost conversations about BPA focus on plastics and ingestion, but one of the most significant and overlooked exposure routes is skin contact.
When BPA is used in plastics it is typically bound within a polymer matrix, meaning it doesn’t readily transfer unless the plastic is heated, degraded, or stressed over time.
Thermal receipts on the other hand are a different story.
Receipt paper doesn’t use traditional liquid ink. It relies on a heat-activated chemical coating, where BPA (or BPS) acts as a colour developer. In this case, the BPA is unbound and present on the surface of the paper, making it easily transferable to skin.
Human studies show that handling thermal receipts transfers measurable amounts of BPA to skin, and it can penetrate into deeper skin layers where it is not easily removed by washing. (Mendum et al., 2010)
In a controlled human study, participants who used hand sanitiser before handling receipts experienced a rapid and significant rise in bioactive BPA in blood and urine within 90 minutes. (Hormann et al., 2014)
The same study demonstrated that ingredients in sanitisers and lotions act as dermal penetration enhancers, increasing BPA absorption by up to 100-fold compared to dry hands. (Hormann et al., 2014)
Occupational research has also shown that cashiers and frequent receipt handlers have higher BPA levels than the general population, highlighting cumulative exposure risk. (Ehrlich et al., 2014)
BPA and its substitutes are classified as endocrine-disrupting chemicals. They interfere with hormone signalling and have been associated with reproductive, metabolic, and hormonal effects.
This isn’t fear-mongering. It’s about understanding exposure pathways, frequency, and context. An occasional receipt is unlikely to be a major concern.
But repeated daily handling is where awareness and taking steps to mitigate exposure matters.
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