Keyphrase: What Is the Difference Between BPA and BPA-Free

Written by Jota Machinery | Bruce Zhou

Introduction

Every time you receive a printed receipt from a store, café, or ATM, you’re touching a piece of thermal paper. This type of paper doesn’t rely on ink — instead, it’s coated with special chemicals that react to heat. For decades, one of the most common chemicals used in these coatings was Bisphenol A (BPA).

But as concerns about BPA’s health effects grew, more businesses began advertising “BPA-free” receipts. At first glance, this sounds reassuring. Yet the question remains: Is BPA-free paper truly safer, or is it simply replacing one problem with another?

To answer this, we need to look at how thermal paper works, what role BPA plays, and what actually replaces it in BPA-free products.

How Thermal Paper Works

Thermal paper has a coating that includes three components:

• A color developer (traditionally BPA).
• A leuco dye (a colorless dye that darkens when activated).
• A sensitizer (helps the reaction occur at lower heat).

When heat from a printer head applies pressure and warmth, the developer donates a proton to the dye, making it turn dark and form letters or images.

The key point is that the developer (whether BPA or something else) is usually applied in a free, unbound form on the surface of the paper. That means it can easily transfer to skin during handling.

Why BPA Was Used

BPA became the standard developer because it was:

• Highly effective at producing sharp, dark text.
• Low-cost compared to other options.
• Compatible with existing printing systems.

However, because BPA is free on the paper’s surface, people handling receipts can absorb measurable amounts through their skin. This led to increasing scrutiny of BPA’s health risks.

The Rise of “BPA-Free” Paper

As evidence mounted about BPA’s toxicity, manufacturers began offering receipts labeled BPA-free. This doesn’t mean the paper is chemical-free. It simply means BPA itself is not used.

Instead, most BPA-free receipts substitute other chemicals as developers. The most common are:

• BPS (Bisphenol S): A near twin of BPA, used in ~80% of U.S. receipts today.
• Pergafast 201: A non-phenolic developer designed to avoid endocrine activity.
• Vitamin C-based formulas: Using ascorbic acid and other compounds.
• Blue4est® technology: Developer-free paper that changes color physically.

So, “BPA-free” could mean a much safer paper — or it could mean BPA was simply swapped with another bisphenol like BPS.

Comparing Alternatives

1. BPS (Bisphenol S)

• Chemically very similar to BPA.
• Performs almost identically in receipts.
• Unfortunately, research shows it can disrupt hormones much like BPA.
• Found in the majority of BPA-free receipts today.

2. Pergafast 201

• A urea-based developer (non-phenolic).
• Shows no estrogenic activity in lab tests.
• Considered safer for cashiers and consumers.
• More expensive, limiting adoption.

3. Vitamin C (Ascorbate-based) Systems

• Marketed as “phenol-free.”
• Avoids bisphenols entirely.
• Early studies suggest lower risk, though more research is needed.

4. Blue4est® Technology

• Uses a layered structure with no chemical developers.
• Fully recyclable and approved for food contact.
• Slightly more expensive and has a distinct bluish tint.

Health Impacts

• BPA: Proven endocrine disruptor, linked to reproductive, developmental, and metabolic problems. Easily absorbed through skin, especially by cashiers.
• BPS: Once thought safer, now shown to cause similar hormone disruption. Widely present in human urine samples due to receipt exposure.
• Non-bisphenol developers: Do not mimic estrogen. Safer for skin contact, though some carry other moderate toxicities.
• Developer-free papers: Essentially eliminate hormone-related risks.

Environmental Concerns

• BPA & BPS receipts: Not recyclable, contaminate recycled paper products, and persist in soil and water.
• Phenol-free alternatives: More biodegradable and less polluting. Blue4est receipts are fully recyclable.
• Caution: Even non-phenol chemicals may have ecological toxicity (e.g., Pergafast can be harmful to aquatic life).

Regulations

• European Union: Banned BPA in receipts (2020).
• California (U.S.): Will ban BPA in receipts in 2025, and all bisphenols in 2026.
• Washington State (U.S.): Similar ban on all bisphenols starting 2026.
• Switzerland: Banned BPA and BPS in thermal paper in 2020.
• Other regions: Moving toward restrictions, encouraging “phenol-free” options.

Is “BPA-Free” Really Safer?

The answer depends.

• If “BPA-free” = BPS-based, then no — the risks are nearly the same.
• If “BPA-free” = phenol-free (e.g., Pergafast, Vitamin C, Blue4est), then yes — these papers represent real progress in reducing health and environmental hazards.

Final Takeaway for Businesses & Consumers

For consumers: minimize receipt handling where possible (choose e-receipts, fold receipts printed side inward, or decline them).

For businesses: “BPA-free” isn’t enough. To truly protect workers and customers, move toward phenol-free or developer-free thermal papers. This aligns with upcoming regulations and demonstrates commitment to safety and sustainability.