Appearance and properties: colorless liquid

Density: 1.064g /mL at 25 °C(lit.)

Boiling point: 225 °C(lit.)

Melting point: ?10 °C(lit.)

Flash point: 200 °F

Refractive index: n20/D 1.441(lit.)

Water solubility: insoluble

Stability: Stable. Combustible. Incompatible with oxidizing agents, bases, acids, reducing agents.

Storage conditions: Keep away from heat, sparks,  and flame. Keep away from sources of ignition. Keep container closed when not in use. Store in a tightly closed  container. Store in a cool, dry, well-ventilated area away from incompatible substances.

Vapor density: 5.93 (vs air)

Vapor pressure: 0.159mmHg at 25°C

Usage:Solvent, insecticide, polymer monomer, plastic additive.

Diethyl maleate's Handling and Storage 
Storage: Keep away from heat, sparks, and flame. Keep away from sources of ignition. Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling: Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.