At a glance
| Chemical family | Phthalate plasticizer — diisobutyl phthalate (branched-chain isomer of DBP) |
| CAS number | 84-69-5 (EC number 201-553-2) |
| Classification | EU harmonised classification: Repr. 1B, H360Df — "may damage the unborn child; suspected of damaging fertility" (Annex VI Index 607-623-00-2). REACH Substance of Very High Concern, first for CMR properties (2009) and separately for endocrine-disrupting properties under Article 57(f) (2014). Not an IARC carcinogen classification — DIBP has not been evaluated by IARC. |
| Where you encounter it | Primarily as a plasticizer in adhesive and sealant manufacturing (EPA's identified primary use); also nitrocellulose and cellulose-ether lacquers, nail polish and cosmetics, leather varnishes, printing inks for paper and packaging, and as a partial substitute for DBP in some flexible PVC and rubber applications |
| Sleep micro-environment relevance | Less a mattress-material story than DEHP/DBP, more a furniture-finish and adhesive story — headboard and frame lacquers, wood-glue joints, printed packaging, and personal-care products (nail polish) kept in a bedroom. Migrates from the polymer/coating matrix into dust over time rather than off-gassing quickly. |
| Activated carbon capture | Partial — as a semi-volatile compound it partitions mostly into dust and onto surfaces rather than staying airborne, so gas-phase capture addresses only part of the exposure pathway |
Regulatory & certification status
Where DIBP (Diisobutyl Phthalate) stands across the major regulatory systems and the certifications a bedroom product might carry. Each row links to the governing instrument; where a jurisdiction has no specific measure, that is stated plainly rather than left blank.
| European Union | DIBP is a REACH Substance of Very High Concern, added to the Candidate List in 2009 for CMR (toxic-for-reproduction) properties under Article 57(c) and again in a separate Member State Committee opinion adopted 11 December 2014 for endocrine-disrupting properties under Article 57(f). It is on the Authorisation List (Annex XIV), so its use in the EU requires authorisation (sunset date 21 Feb 2015). Its harmonised CLP classification (Annex VI, Index 607-623-00-2, EC 201-553-2) is Repr. 1B, H360Df — with specific concentration limits of Repr. 1B/H360Df at ≥25% and the lower-tier Repr. 2/H361f at 5–25%. DIBP is also one of four phthalates (with DEHP, DBP, BBP) restricted under Annex XVII entry 51, as amended by Commission Regulation (EU) 2018/2005 (published 18 Dec 2018): the four phthalates must not be present, individually or combined, at 0.1% or more by weight of the plasticised material in toys and childcare articles (in force from 7 Jan 2019) or in any article with prolonged skin or mucous-membrane contact (in force from 7 July 2020). Regulatory — ECHA classification · ECHA SVHC support document (2014) · EUR-Lex, Reg. 2018/2005 |
| United States | Under TSCA, EPA designated DIBP a High-Priority Substance in December 2019 and, in its final risk evaluation released December 2025, determined that DIBP presents unreasonable risk of injury to human health (based on risk to workers from four conditions of use) and to the environment (from seven conditions of use); EPA explicitly did not find unreasonable risk to consumers or the general population from any condition of use. EPA's stated primary use for DIBP is as a plasticizer in adhesive and sealant manufacturing. DIBP is NOT listed on California Proposition 65 — verified against the current OEHHA list, where DBP, DEHP and BBP appear but diisobutyl phthalate (CAS 84-69-5) does not. Separately, under the federal CPSIA, CPSC's 2017 final rule (effective 25 Apr 2018) prohibits DIBP at concentrations above 0.1% in children's toys and childcare articles, based on CPSC's own 2011 toxicity review documenting male reproductive developmental effects. Regulatory — US EPA · CPSC toxicity review · OEHHA |
| Canada | Under CEPA, the final Phthalate Substance Grouping screening assessment (published 2020) concluded that DEHP meets the section 64 'toxic' criteria (harmful to the environment), while the other 14 phthalates in the grouping — including DIBP — do not meet any of the section 64 criteria. DIBP is therefore not recommended for, or added to, Schedule 1 on the basis of that assessment. (Note: Canada's Phthalates Regulations, SOR/2016-188, under the Canada Consumer Product Safety Act, restrict DEHP, DBP, BBP, DINP, DIDP and DNOP in toys and childcare articles but do not name diisobutyl phthalate; a draft-record claim that DIBP is restricted under SOR/2016-188 was not supported by the regulation text and has been removed.) Regulatory — Government of Canada · Justice Laws Canada |
| Australia | Australia's industrial chemicals regulator (NICNAS, now AICIS) assessed DIBP in an Existing Chemical Hazard Assessment (2008) and addressed it in the phthalate-esters environment tier II assessment (2020), describing evidence of male reproductive and developmental toxicity. No specific binding IChEMS register schedule listing for DIBP was confirmed against a primary source, so any regulatory-listing status is treated as unconfirmed. Regulatory — AICIS |
| United Kingdom | On EU exit, GB inherited the EU REACH framework, so DIBP's reproductive-toxicant (Repr. 1B) status and its presence on the EU SVHC/Authorisation List at end of transition carried into UK REACH and GB mandatory (GB CLP) classification. However, the GB candidate and authorisation lists have been maintained separately since 2021 and can diverge from the EU, and DIBP's specific current GB listing status was not independently confirmed against a primary HSE source (only the generic HSE landing pages were available). Treat the GB position as 'inherited the EU classification' rather than a verified line-item listing. Regulatory — HSE |
| Certifications | CertiPUR-US: its program prohibits phthalates regulated by the U.S. CPSC in certified foams, and DIBP is one of the phthalates the CPSC permanently prohibits under the CPSIA (2017 final rule), so DIBP falls within that bar. OEKO-TEX Standard 100: DIBP (CAS 84-69-5) is an SVHC and is treated as a restricted phthalate; total-phthalate limit values apply, with the limits and scope varying by product class. GREENGUARD Gold certifies low chemical/VOC emissions and is not designed to screen for a low-volatility plasticiser like DIBP; it is not a phthalate-restriction standard. (The relevant CertiPUR-US wording is on its certification/program pages, not the generic 'About' page; cited accordingly.) Industry — CertiPUR-US · Federal Register |
| The 72-hour test window | Largely missed. DIBP is a semi-volatile plasticiser additive (low vapour pressure — roughly 0.01 Pa at 20°C) that tends to migrate out of the polymer or coating matrix into dust and onto surfaces over time rather than off-gas quickly, so a short ~72-hour VOC chamber test is not expected to reliably capture it. Inferred — from the compound's volatility/emission profile versus the VOC focus of short chamber tests |
What it is
DIBP — diisobutyl phthalate, CAS 84-69-5, EC 201-553-2 — is a phthalate ester formed from phthalic anhydride and isobutanol. It is the branched-chain structural cousin of DBP (dibutyl phthalate), which uses a straight-chain butyl group instead of DIBP's branched isobutyl group. The two compounds are similar enough in cost, performance, and chemistry that DIBP has functioned for years as a drop-in substitute for DBP — CPSC's own toxicity review notes plainly that "because DiBP has similar properties as dibutyl phthalate (DBP), it can be used as a substitute for DBP." Regulatory — CPSC Toxicity Review of DiBP, 2011
That substitution pattern is why DIBP belongs in this Atlas next to DEHP and DBP rather than as an isolated entry. ECHA's own harmonised classification — the legally binding EU-wide hazard label, not an inferred comparison — places DIBP in Repr. 1B with hazard statement H360Df: "may damage the unborn child. Suspected of damaging fertility." That is the same category and the same hazard statement carried by DEHP and DBP. Regulatory — ECHA Annex VI classification
The mechanism: anti-androgenic "phthalate syndrome"
DIBP's reproductive toxicity works through the same pathway documented for DBP, DEHP and BBP: it disrupts androgen (testosterone) signaling during fetal male reproductive development. ECHA's 2014 SVHC support document states that "the structures affected by in utero exposure to DIBP are indicative of an antiandrogenic mode of action," specifically the tissues that depend on dihydrotestosterone signaling — external genitalia, anogenital distance, and areola/nipple development. Regulatory — ECHA SVHC support document, Section 4.2.2 This cluster of effects — reduced anogenital distance, nipple retention, undescended testes, hypospadias, reduced testicular testosterone — is what toxicologists call phthalate syndrome, and it has been hypothesized to be part of a broader testicular dysgenesis syndrome with origins in fetal life.
The clearest single piece of evidence that DIBP is not a "safer" substitute for DBP is a direct head-to-head study. Borch and colleagues (2006) dosed pregnant rats with DIBP and examined male offspring for the same endpoints used to characterize DBP's toxicity. Their conclusion, stated in their own abstract: "DiBP has similar testicular and developmental effects as DBP and DEHP," including reduced anogenital distance, reduced testicular testosterone production and content, and the same histopathological changes (Leydig cell hyperplasia, Sertoli cell vacuolization) seen with DBP and DEHP exposure. The authors explicitly frame this as "a reason for concern about the use of DiBP as a substitute for DBP." Peer-reviewed — Borch et al. 2006, Toxicology Letters
A 2019 systematic review of DIBP's animal toxicology data by Yost and colleagues, published in Environment International, compiled the broader evidence base behind these findings across the developing reproductive tract and other endpoints, reinforcing that the hazard is well-established across multiple independent studies rather than resting on a single result. Peer-reviewed — Yost et al. 2019, Environment International
Where you encounter it — and how DIBP differs from DEHP/DBP
This is where DIBP's bedroom story genuinely diverges from its more famous relatives. DEHP and DBP are strongly associated with PVC — flexible vinyl mattress covers, vinyl flooring, shower curtains — because they are effective plasticizers for that specific polymer at scale. DIBP is different: CPSC's toxicity review notes it is "considered a specialty plasticizer that is too volatile for use in PVC" on its own, and is instead used for nitrocellulose (where it is described as the lowest-cost plasticizer for cellulose nitrate), cellulose ether, and polyacrylate/polyacetate dispersions. Regulatory — CPSC Toxicity Review of DiBP, 2011
Concretely, that means DIBP shows up in nail polish and cosmetics, lacquers and leather varnishes, printing inks for paper and packaging, and — per EPA's TSCA risk evaluation, which identifies this as DIBP's primary current use — as a plasticizer in adhesive and sealant manufacturing. Regulatory — US EPA, DIBP risk evaluation In a bedroom, that profile points less toward the mattress cover and more toward furniture: lacquered or varnished headboards and frames, wood-glue joints in flat-pack furniture, printed packaging that ships with new goods, and any nail polish or cosmetics stored in the room. Some flexible PVC and coating applications do use DIBP as a partial DBP substitute, but it is not the dominant mattress-cover plasticizer that DEHP and DBP are.
The regrettable-substitution pattern, and why it matters
DIBP's rise is one of the cleaner case studies of "regrettable substitution" in this Atlas: a compound that increased in use specifically because a close structural relative was restricted, while carrying much of the same hazard. Biomonitoring data captures this shift directly. NHANES data analyzed by Zota, Calafat and Woodruff (2014) tracked phthalate metabolite trends in the US population from 2001 to 2010 and documented rising exposure to DIBP's metabolite alongside declining exposure to some restricted phthalates over the same period — consistent with substitution in the marketplace. Peer-reviewed — Zota et al. 2014, Environmental Health Perspectives
Regulators have caught up to this pattern, at least partially. Rather than continuing to restrict phthalates one at a time — which invites exactly the kind of substitution DIBP represents — both the EU and the US now evaluate anti-androgenic phthalates as a group. The EU's Annex XVII entry 51 restriction covers DEHP, DBP, BBP and DIBP together under a single combined 0.1% concentration limit, meaning manufacturers cannot simply swap one for another to stay under the line. Regulatory — Regulation (EU) 2018/2005 EPA's December 2025 TSCA risk evaluations for DIBP were released alongside, and explicitly cross-referenced with, evaluations for DEHP, DBP, BBP and DCHP, including a dedicated Technical Support Document for the Cumulative Risk Analysis of these phthalates together with DINP — an acknowledgment that dose-additive anti-androgenic effects from multiple phthalates matter more than any single compound's exposure in isolation. Regulatory — US EPA
What helps reduce exposure
Treat it as part of the phthalate family, not a separate problem. Interventions that reduce DEHP and DBP exposure — regular dusting and HEPA vacuuming, hand-washing before eating, choosing solid-wood or low-VOC/low-plasticizer furniture finishes — also reduce DIBP exposure, since it partitions into household dust the same way.
Look at furniture finishes and adhesives, not just the mattress. Because DIBP's largest documented use is in adhesives, sealants, and lacquers rather than PVC mattress covers, a phthalate-conscious bedroom audit should extend to headboards, bed frames, and any lacquered or varnished furniture — not stop at the mattress.
Store nail polish and similar cosmetics outside the bedroom, or in a sealed container. CPSC's review documents DIBP in nail polish and cosmetic formulations; these are small but avoidable sources within reach of a nightstand.
Ventilate and dust regularly. As with other SVOC plasticizers, DIBP accumulates in settled dust rather than staying airborne, so regular cleaning and fresh-air exchange reduce the reservoir available for exposure.
What does NOT help
- Assuming "DBP-free" labeling covers DIBP. Because the two compounds are chemically distinct, a product or certification that screens specifically for DBP will not necessarily catch DIBP. Look for phthalate-free labeling broadly, or certifications (OEKO-TEX Standard 100, MADE SAFE) that name DIBP or restrict phthalates as a class.
- Relying on GREENGUARD/GREENGUARD Gold to catch it. That certification targets VOC emissions and is not built to screen for a low-volatility plasticiser like DIBP, which mostly migrates into dust rather than off-gassing.
- Short-duration "off-gas before use" airing out of new furniture. This may reduce truly volatile VOCs but does little for a semi-volatile compound whose main exposure pathway is dust and surface contact over months, not initial air emission.
Open research questions
- Direct measurements of DIBP concentrations in bedroom dust specifically (as opposed to whole-home dust) are sparse compared to the DEHP literature; most bedroom-specific dust studies to date emphasize DEHP and DBP. Speculation
- The relative contribution of furniture adhesives/lacquers versus nail polish/cosmetics to a typical bedroom's total DIBP dust burden has not been quantified in a single study. Speculation
- How much the EU's combined 0.1% Annex XVII limit (DEHP+DBP+BBP+DIBP) has measurably shifted manufacturer formulations toward non-phthalate plasticizers versus toward other, not-yet-restricted phthalates. Speculation
The Embr Exposure Ledger: Diisobutyl phthalate
One chemical, several public questions, answered from independent datasets and joined here — the environment it shows up in, the body burden it carries, how it is regulated, and what actually reduces it.
Detection and body-burden figures are occurrence data, not a personal measurement or a health diagnosis. Part of the Embr Exposure Ledger — an open, cross-dataset chemical join (download the data), reusable with attribution.
Citations
- ECHA. Annex VI harmonised classification: Diisobutyl phthalate (DIBP), EC 201-553-2, CAS 84-69-5 — Repr. 1B, H360Df, Index 607-623-00-2. ECHA Regulatory
- ECHA (2014). Support document to the MSC opinion identifying diisobutyl phthalate (DIBP) as a substance of very high concern because of endocrine disrupting properties (Article 57(f)). Adopted 11 December 2014. ECHA Regulatory
- Borch J, Axelstad M, Vinggaard AM, Dalgaard M (2006). "Diisobutyl phthalate has comparable anti-androgenic effects to di-n-butyl phthalate in fetal rat testis." Toxicology Letters, 163(3):183-190. PMID 16458459. DOI 10.1016/j.toxlet.2005.10.020 Peer-reviewed
- Yost EE, Euling SY, Weaver JA, Beverly BE, Keshava N, Mudipalli A, et al. (2019). "Hazards of diisobutyl phthalate (DIBP) exposure: A systematic review of animal toxicology studies." Environment International, 125:579-594. PMID 30591249. DOI 10.1016/j.envint.2018.09.038 Peer-reviewed
- Zota AR, Calafat AM, Woodruff TJ (2014). "Temporal Trends in Phthalate Exposures: Findings from the National Health and Nutrition Examination Survey, 2001-2010." Environmental Health Perspectives, 122(3):235-241. PMID 24425099. DOI 10.1289/ehp.1306681 Peer-reviewed
- US CPSC (2011, prepared by Versar/SRC). Final Toxicity Review of Diisobutyl Phthalate (DiBP, CASRN 84-69-5). CPSC Regulatory
- US EPA. Risk Evaluation for Diisobutyl Phthalate (DIBP), CASRN 84-69-5. Final risk evaluation and technical support documents released December 2025. US EPA Regulatory
- European Union. Commission Regulation (EU) 2018/2005 of 17 December 2018 amending Annex XVII to REACH (Regulation (EC) No 1907/2006) as regards bis(2-ethylhexyl) phthalate (DEHP), dibutyl phthalate (DBP), benzyl butyl phthalate (BBP) and diisobutyl phthalate (DIBP), entry 51. EUR-Lex Regulatory
Frequently asked questions
Is DIBP the same as DBP?
No, but they are close structural cousins with a shared reputation problem. DBP (dibutyl phthalate) uses a straight-chain butyl group; DIBP (diisobutyl phthalate) uses a branched isobutyl group. ECHA's own harmonised classification places both in Repr. 1B (H360Df), and a direct 2006 rat study (Borch et al.) found DIBP produces "comparable anti-androgenic effects to di-n-butyl phthalate" — including reduced anogenital distance and lower fetal testicular testosterone. DIBP became more common industrially specifically as a drop-in substitute once DBP came under regulatory pressure, which is why toxicologists treat the two together rather than as separate stories.
Where would DIBP actually show up in a bedroom?
Less in the mattress itself than DEHP or DBP, and more in the finishing materials around it. EPA's TSCA risk evaluation identifies DIBP's primary use as a plasticizer in adhesive and sealant manufacturing. CPSC's toxicity review documents its use in nitrocellulose lacquers, cellulose-ether finishes, nail polish and cosmetics, leather varnishes, and printing inks for paper and packaging — so it is more likely to enter a bedroom via furniture lacquer, headboard adhesive, printed packaging, or a nightstand's nail-polish drawer than via the mattress cover.
Is DIBP banned?
Partially, and only in specific contexts. In the EU, DIBP has required REACH authorisation since 2015 and, since 7 July 2020, DIBP plus DEHP, DBP and BBP combined cannot exceed 0.1% by weight in plasticised material for toys, childcare articles, or articles with prolonged skin or mucous-membrane contact (Annex XVII entry 51, Regulation (EU) 2018/2005). In the US, CPSC permanently prohibited DIBP above 0.1% in children's toys and childcare articles under the 2017 CPSIA rule. For adult bedroom products generally, DIBP is not banned in either jurisdiction — EPA's December 2025 final TSCA risk evaluation found unreasonable risk to workers and the environment from specific industrial uses, but did not find unreasonable risk to consumers or the general population from any use.
Why do phthalates keep getting replaced by other phthalates?
Because regulators historically restricted phthalates one compound at a time, and industry could substitute a close chemical cousin that wasn't yet named in the rule — even when the toxicology was similar. DIBP's rise as a DBP substitute is a textbook case: it shares DBP's core phthalate structure and its anti-androgenic mechanism, but for years fell outside restrictions written to name DBP specifically. Regulators have since caught up — the EU's Annex XVII entry 51 restriction and the EPA's phthalate program both now evaluate these anti-androgenic phthalates as a group rather than compound by compound, using cumulative risk assessment. That shift is itself evidence the individual-substitution pattern was a real problem.
Related compounds
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Last reviewed 2026-07-07. If you find a factual error, contact us.