Melting point

172-175 °C(lit.)

Boiling point

285 °C(lit.)

density

1.32

vapor density

3.81 (vs air)

vapor pressure

1 mm Hg ( 132 °C)

refractive index

1.6320

Fp

165 °C

storage temp.

Store below +30°C.

solubility

H2O: 50 mg/mL, clear

pka

10.35(at 20℃)

form

Needle-Like Crystals or Crystalline Powder

color

White to off-white

Odor

odorless

Water Solubility

70 g/L (20 ºC)

Sensitive

Air & Light Sensitive

Merck

14,4808

BRN

605970

Henry's Law Constant

(x 10-9 atm?m3/mol): <2.07 at 20 °C (approximate - calculated from water solubility and vapor pressure)

Exposure limits

NIOSH REL: 15-min ceiling 2, IDLH 50; OSHA PEL: TWA 2; ACGIH TLV: TWA 2 (adopted).

Stability:

Stable. Combustible. Incompatible with strong oxidizing agents, strong bases, oxygen, ferric salts. Light and air-sensitive. Discolours in air.

InChIKey

QIGBRXMKCJKVMJ-UHFFFAOYSA-N

LogP

0.59 at 20℃

CAS DataBase Reference

123-31-9(CAS DataBase Reference)

NIST Chemistry Reference

Hydroquinone(123-31-9)

IARC

3 (Vol. 15, Sup 7, 71) 1999

EPA Substance Registry System

Hydroquinone (123-31-9)

Hazard Codes

Xn,N

Risk Statements

22-40-41-43-50-68-R68-R50-R43-R41-R40-R22

Safety Statements

26-36/37/39-61-S61-S36/37/39-S26

RIDADR

2662

WGK Germany

3

RTECS

MX3500000

Autoignition Temperature

930 °F

TSCA

Yes

HazardClass

9

PackingGroup

III

HS Code

29072210

Hazardous Substances Data

123-31-9(Hazardous Substances Data)

Toxicity

LD50 orally in rats: 320 mg/kg (Woodard)

IDLA

50 mg/m3