Dioctyl sebacate (also di(2-ethylhexyl) sebacate, commonly abbreviated as DOS, DEHS, and BEHS) is an organic compound which is the diester of sebacic acid and 2-ethylhexanol.

Dioctyl sebacate

Names
IUPAC name Bis(2-ethylhexyl) decanedioate
Systematic IUPAC name [Heptane-3-yl-(-3-methane-1,1-diyl)-] decanedioate
Other names Di(2-ethylhexyl) sebacate, Proviplast 1988, dioctyl sebacate (archaic)
Identifiers
CAS Number	122-62-3 Y
3D model (JSmol)	Interactive image
ChemSpider	28959 Y
ECHA InfoCard	100.004.145
PubChem CID	31218
UNII	U9LS47Q72Q Y
CompTox Dashboard (EPA)	DTXSID7025055
InChI InChI=1S/C26H50O4/c1-5-9-17-23(7-3)21-29-25(27)19-15-13-11-12-14-16-20-26(28)30-22-24(8-4)18-10-6-2/h23-24H,5-22H2,1-4H3 Y Key: VJHINFRRDQUWOJ-UHFFFAOYSA-N Y InChI=1/C26H50O4/c1-5-9-17-23(7-3)21-29-25(27)19-15-13-11-12-14-16-20-26(28)30-22-24(8-4)18-10-6-2/h23-24H,5-22H2,1-4H3 Key: VJHINFRRDQUWOJ-UHFFFAOYAA
SMILES CCCCC(CC)COC(=O)CCCCCCCCC(=O)OCC(CC)CCCC
Properties
Chemical formula	C26H50O4
Molar mass	426.682 g·mol−1
Density	0.9 of water
Melting point	−48 °C (−54 °F; 225 K)
Boiling point	256 °C (493 °F; 529 K) at 0.7 kPa
Solubility in water	none
Vapor pressure	0.000024 Pa at 37 °C
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	reacts with oxidants
Flash point	210 °C (410 °F; 483 K) open cup
Lethal dose or concentration (LD, LC):
LD50 (median dose)	5 g/kg (rat, orally)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

It is an oily colorless liquid and is used as a plasticizer, including in the explosive C4.^[1] It has also found use in Dot 5 brake fluid, in ester-based engine oils and additives, as seed particle for particle image velocimetry (PIV) and as a model compound that forms stable aerosols.