Diisodecyl phthalate (DIDP)

Chemical name: Diisodecyl phthalate

CAS No. 26761-40-0 and 68515-49-1

EINEC No. 271-091-4 and 247-977-1

Molecular formula: C28H46O4

Molecular weight: 446.66

Synonyms: Bis(isodecyl) phthalate. More


Diisodecyl phthalate (DIDP) is a common high phthalate plasticiser, used primarily to soften Polyvinyl chloride (PVC). Its main properties include volatility resistance, heat stability and electric insulation. It is frequently used as a plasticiser for heat-resistant electrical cords, artificial leather used in car interiors, and PVC flooring.

Non-PVC applications are relatively small but include use in anti-corrosion and anti-fouling paints, sealing compounds and textile inks.

EU Risk Assessment

The European Commission has confirmed that Diisodecyl phthalate (DIDP) poses no risk to either human health or the environment through any current use. These findings were published in the EU Official Journal in 2006, confirming the outcome of a risk assessment involving more than 10 years of extensive scientific evaluation by EU regulators.

Following the adoption of EU legislation with regards to the marketing and use of DIDP in toys and childcare articles, the risk assessment conclusions clearly state that there is no need for any further measures to regulate its use. Current legislation limits the use of DIDP only to children’s articles which cannot be placed in the mouth.

The rigorous EU risk assessments, which include a high degree of conservatism and built-in safety factors, have been carried out under the strict supervision of the European Commission and provide a clear scientific evaluation on which to judge whether or not a particular substance can be safely used.

The final Summary and Full EU Risk Assessment reports on DIDP have been published by the European Commission's European Chemical Bureau (ECB).

The Risk Assessment Report is also presented to the Organisation for Economic Co-operation and Development as a contribution to the Chapter 19, Agenda 21 goals for evaluating chemicals, agreed at the United Nations Conference on Environment and Development, held in Rio de Janeiro in 1992.