Plasticizers are chemicals used in many plastic products such as PVC, rubber and polyurethane to give them flexibility and elasticity. They are particularly widespread in applications such as toys, food packaging and medical devices.

When bonding plastics, there can be diffusion of plasticizers from the substrate into the adhesive or from the adhesive into the substrate. This can lead to embrittlement or even failure.

There are several types of plasticizers, including phthalates, benzophenones, bisphenol A (BPA), and alternative plasticizers such as citrates and adipates. However, some of these plasticizers are controversial because they can have health effects, especially with prolonged exposure and in high concentrations. Phthalates and BPA, for example, have been linked to hormonal imbalances, infertility, and other health problems.

For this reason, some plasticizers are restricted or banned in various applications. For example, the EU has banned the use of some phthalates in toys and baby products. There is also increasing demand for alternative plasticizers that are considered safer and based on more sustainable raw materials.