Letter: D
Dielectric oil Oil with a very low factor of conductivity used as insulation in electrical apparatus(transformers, capacitors...).
Dipping The immersion of the bead cores in a solution composed of heptane and rubber designed to make it easier to then apply the bead.
Dow Jones Sustainability Index Family of indices created in September, 1999 by the Swiss ethical rating agency, SAM Sustainability Group, together with the Dow Jones stock exchange of New York, in order to evaluate at a European and global level the share performance of those companies oriented towards sustainability.