Benzyl butyl phthalate (BBP) in food: ingestion safety
Moderate risk(People-specific data is limited; this page draws from human adult context.) Benzyl butyl phthalate (BBP) is a di-ester phthalate plasticizer most commonly used in vinyl tile flooring, artificial leather, traffic cones, and food packaging materials. IARC Group 3 (insufficient carcinogenicity evidence); primary concern is reproductive toxicity via the same anti-androgenic mechanism as DEHP and DBP — inhibition of fetal testosterone synthesis during the masculinization programming window. In adults, epidemiological studies using NHANES urinary metabolite data (mono-benzyl phthalate, MBzP) show associations between BBP exposure and reduced testosterone in males and altered ovarian hormone levels in females at population-relevant exposure concentrations. BBP is detectable in >70% of NHANES participants; primary exposure routes include vinyl flooring off-gassing (occupational and residential), food contact migration, and indoor dust. REACH Annex XIV listed; EU manufacturers require authorization for uses since 2015.
What is benzyl butyl phthalate (bbp)?
The IUPAC name is 2-O-benzyl 1-O-butyl benzene-1,2-dicarboxylate.
Also known as: 2-O-benzyl 1-O-butyl benzene-1,2-dicarboxylate, Benzyl butyl phthalate, BUTYL BENZYL PHTHALATE, Sicol.
- IUPAC name
- 2-O-benzyl 1-O-butyl benzene-1,2-dicarboxylate
- CAS number
- 85-68-7
- Molecular formula
- C19H20O4
- Molecular weight
- 312.4 g/mol
- SMILES
- CCCCOC(=O)C1=CC=CC=C1C(=O)OCC2=CC=CC=C2
- PubChem CID
- 2347
Risk for people
Moderate riskBenzyl butyl phthalate (BBP) is a di-ester phthalate plasticizer most commonly used in vinyl tile flooring, artificial leather, traffic cones, and food packaging materials. IARC Group 3 (insufficient carcinogenicity evidence); primary concern is reproductive toxicity via the same anti-androgenic mechanism as DEHP and DBP — inhibition of fetal testosterone synthesis during the masculinization programming window. In adults, epidemiological studies using NHANES urinary metabolite data (mono-benzyl phthalate, MBzP) show associations between BBP exposure and reduced testosterone in males and altered ovarian hormone levels in females at population-relevant exposure concentrations. BBP is detectable in >70% of NHANES participants; primary exposure routes include vinyl flooring off-gassing (occupational and residential), food contact migration, and indoor dust. REACH Annex XIV listed; EU manufacturers require authorization for uses since 2015.
Regulatory consensus
8 regulatory and scientific bodies have classified Benzyl butyl phthalate (BBP). The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| IARC | 2000 | Group 3 (not classifiable as to carcinogenicity) | IARC Monograph 73 (2000). Grouped with DEHP and DBP as primary anti-androgenic phthalates of concern. BBP produces equivalent testicular dysgenesis syndrome (TDS) features in animal models as DBP, including reduced anogenital distance and testosterone suppression. EU REACH SVHC — Reproductive Toxicant Category 1B. Used in vinyl tile flooring, artificial leather, sealants, and food packaging; EU Annex XIV listing requires authorization for continued use in the EU. |
| EPA CTX / IRIS | — | C (Possible human carcinogen) | |
| EPA CTX / IARC | — | Group 3 - Not classifiable as to its carcinogenicity to humans | |
| EPA CTX / Genetox | — | Genotoxicity: negative (Ames: negative, 3 positive / 11 negative reports) | |
| EPA CTX / Genetox | — | Genotoxicity: negative (Ames: negative, 3 positive / 11 negative reports) | |
| EPA CTX / Skin-Eye | — | Eye Irritation: Not classified (score: low) | |
| EPA CTX / Skin-Eye | — | Skin Irritation: Not classified (score: low) | |
| EPA CTX / Skin-Eye | — | Skin Irritation: Category 6.3B (Category 3) (score: moderate) |
Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.
Where you encounter benzyl butyl phthalate (bbp)
- Consumer Products — Plastic bottles and containers, Food packaging, Plastic toys and household items
- Drinking Water — Leaching from plastic pipes, Migration from bottled water containers
- Indoor Environments — Off-gassing from plastic furniture, Degradation of plastic products
Safer alternatives
Lower-risk approaches that achieve a similar outcome to Benzyl butyl phthalate (BBP):
-
DINCH or DOTP
Trade-offs: May require reformulationRelative cost: 1.2-2×
Frequently asked questions
What products contain benzyl butyl phthalate (bbp)?
Benzyl butyl phthalate (BBP) appears in: Plastic bottles and containers (Consumer products); Food packaging (Consumer products); Leaching from plastic pipes (Drinking water); Migration from bottled water containers (Drinking water); Off-gassing from plastic furniture (Indoor environments).
Why do regulators disagree about benzyl butyl phthalate (bbp)?
Benzyl butyl phthalate (BBP) has been classified by 8 agencies including IARC, EPA CTX / IRIS, EPA CTX / IARC, EPA CTX / Genetox, EPA CTX / Genetox, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.
See Benzyl butyl phthalate (BBP) in the food app
Look up products containing benzyl butyl phthalate (bbp), compare to alternatives, and explore the full data record.
Open in food View raw API dataSources (3)
- IARC Monographs Volume 73: Benzyl Butyl Phthalate — Evaluation of Carcinogenic Risks to Humans (Group 3) (2000) — regulatory
- ECHA/EU REACH: Benzyl Butyl Phthalate — SVHC Identification, Reproductive Toxicant Category 1B, Annex XIV Authorization Required (2011) — regulatory
- US EPA: Benzyl Butyl Phthalate — IRIS Toxicological Review and Health Effects Assessment (2001) — regulatory
Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →