Melting point :59-61 °C (lit.)
Boiling point :170 °C/19 mmHg (lit.)
Density :0.99 g/mL at 25 °C (lit.)
refractive index :1.6415 (estimate)
Flash point :170°C/19mm
storage temp. :Sealed in dry,2-8°C
form :Crystalline Powder and Chunks
color :Light yellow to brownish
Specific Gravity :0.99
Water Solubility :Miscible with ether and hot alcohol. Immiscible with water.
Merck :14,9504
BRN :606478
Stability :Stable. Combustible. Incompatible with strong oxidizing agents.
InChIKey :JRXXLCKWQFKACW-UHFFFAOYSA-N
CAS DataBase Reference :501-65-5(CAS DataBase Reference)
NIST Chemistry Reference :Diphenylethyne(501-65-5)
EPA Substance Registry System :Benzene, 1,1'-(1,2-ethynediyl)bis- (501-65-5)

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362 H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P264 Wash hands thoroughly after handling. P264 Wash skin thouroughly after handling. P280 Wear protective gloves/protective clothing/eye protection/face protection. P302+P352 IF ON SKIN: wash with plenty of soap and water. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P321 Specific treatment (see … on this label). P332+P313 IF SKIN irritation occurs: Get medical advice/attention. P362 Take off contaminated clothing and wash before reuse.