Such fluids are commonly used in cosmetics, such as deodorants, sunblocks, hair sprays and skin care products.

In the presence of a strong base such as KOH, the polymer/ring mixture is equilibrated, allowing complete conversion to the more volatile cyclic siloxanes:[10] where n is a positive integer.

[11] A scientific review in Canada has determined that “Siloxane D5 does not pose a danger to the environment”[12] and a scientific assessment of D5 by the Australian government stated, "the direct risks to aquatic life from exposure to these chemicals at expected surface water concentrations are not likely to be significant.

"[13] However, in the European Union, D5 was characterized as a substance of very high concern (SVHC) due to its PBT and vPvB properties and was thus included in the candidate list for authorisation.

[14] Since 31 January 2020, D5 cannot be placed on the market in the European Union in wash-off cosmetic products in a concentration equal to or greater than 0.1 % by weight.