Beyond BPA-Free: Phthalates, Nitrosamines & Other Substances to Check

“BPA-free” has become the most common claim on baby feeding products — and one of the least informative. It answers a single question about a single substance, while telling you nothing about the others that regulators, retailers and testing laboratories actually look at.

This guide explains what the claim does and does not cover, which substances belong on a buyer’s checklist, and how to ask for documentation that means something.

What “BPA-Free” Actually Claims

Bisphenol A is a monomer used in polycarbonate and some epoxy resins. A BPA-free declaration says one thing: the material does not use BPA in its formulation.

It does not say:

• that the material contains no other substance of concern;
• that migration testing has been performed on your specific part and colour;
• that the product meets the food-contact regulations of your target market;
• that the declaration applies to accessories, decoration or packaging.

That gap is where compliance risk lives — and it is why the broader framework in safety certifications explained matters more than any single claim.

The Substances on a Buyer’s Checklist

Phthalates

Phthalates are plasticisers, historically used to make PVC soft and flexible. They are among the most heavily restricted substance families in children’s products, and in many markets their presence in feeding items is either banned or tightly limited.

Why buyers overlook them: a product can be BPA-free and still contain a phthalate in a soft component, a decoration ink or a packaging film. The honest question is not “is it BPA-free?” but “which plasticisers are present, and in which parts?”

Bisphenol substitutes

When BPA was removed from many formulations, some manufacturers moved to related compounds such as BPS or BPF. These are different substances with their own regulatory status — and they are not covered by a “BPA-free” claim.

The practical point: ask which bisphenol family a material uses, not merely whether BPA is absent.

Nitrosamines and N-nitrosatable substances

This family of substances is particularly relevant to natural rubber and latex components such as latex nipples and soothers. Their formation is linked to the rubber formulation and vulcanisation process, which is precisely why they are regulated for infant feeding items in several markets.

For buyers, this means a latex nipple requires a different and additional set of questions than a silicone one — the material comparison is covered in silicone vs latex nipples.

Heavy metals and pigments

Lead, cadmium and other heavy metals can appear through pigments and colourants. This is the reason a natural-colour declaration does not cover a deeply pigmented part: the risk sits in the colour, not only in the polymer.

The practical rule: test the colour you ship.

Additives, antioxidants and processing aids

Polymers contain more than base resin: stabilisers, antioxidants, lubricants, release agents and colourants. Each is a formulation decision, and each can be subject to migration limits. This is why “food-grade material” is a starting point, not a conclusion.

Printing inks and adhesives

Decoration sits in the food-contact chain. Inks and adhesives used on the bottle or on labels are formulation decisions that belong in your compliance file — see custom colours, logos and decoration options.

Why Migration Testing Is the Real Question

Substance restrictions are enforced through migration testing: measuring how much of a substance transfers from the material under defined conditions of temperature, time and simulant (water, acidic, fatty or alcoholic) that approximate real use.

Three consequences follow:

1. A material declaration is not a test result. One describes a formulation; the other measures behaviour under use conditions.
2. Conditions matter. A bottle used with hot milk and sterilised repeatedly is not the same test as a room-temperature cold-fill.
3. The result attaches to the part, grade and colour tested. Change any of them and the conclusion may no longer hold.

The testing framework, simulants and documentation to request are set out in food-contact testing explained.

The Legal Landscape Varies by Market

Because the exact limits and lists differ, work from your destination market’s requirements rather than a generic “non-toxic” claim.

How to Ask Suppliers the Right Question

For latex parts, add the nitrosamine question explicitly. For decorated parts, ask about inks and adhesives.

What Good Practice Looks Like on the Factory Side

• Grades are frozen by name rather than described generically, so a declaration can be matched to a part.
• Colour changes trigger re-testing, because pigment loading is a formulation change.
• Supplier relationships are stable enough to hold grades to specification — substitution is where declarations and reality diverge.
• Records are traceable from finished carton back to material batch, so a question can be answered with evidence rather than recollection.

These are operational habits rather than paperwork, which is why they sit inside quality control as much as inside compliance.

Frequently Asked Questions

Is BPA-free enough?

No. It addresses one substance. Buyers should ask about restricted substance families, migration testing for the specific part and colour, and the requirements of the destination market.

Are BPS and BPF safer than BPA?

They are different substances with their own regulatory evaluations. The useful question is which one a formulation uses and what testing supports it, rather than assuming a substitution is automatically better.

Do silicone products need the same checks?

Silicone is a different chemistry, so the specific substance risks differ — but the principle is identical: formulate by grade, test the part as used, document it. Nitrosamine concerns are associated mainly with rubber-based components.

Why does colour matter so much?

Pigments and colourants are part of the formulation, and heavy metals can enter through them. A declaration for natural-colour resin does not automatically cover a dark, heavily pigmented part.

What if our supplier only provides a declaration letter?

Ask for the full test report for your specification. A letter summarising that a material is “compliant” tells you less than a report showing a method, conditions and results.

The Bottom Line

BPA-free is a starting line, not a finish line. The substance families that actually drive compliance — phthalates, bisphenol substitutes, nitrosamines in rubber parts, heavy metals in pigments, additives and inks — are addressed by testing the specific part, in the colour you ship, under conditions that resemble real use. Ask for those reports, and read them; the next step is knowing how, which is covered in how to read third-party test reports.

BebeFree manufactures feeding products across PP, PPSU, glass, silicone and rubber-based components, with material declarations and test documentation available per part and colour. See our product range or request documentation for your specification.

Related reading: Safety certifications explained · Food-contact testing: migration & lab reports · Silicone vs latex nipples · Compliance & certifications guide