Physical and Chemical Properties

Hydrogen peroxide is a clear and colorless liquid. It has a slightly pungent odor. Hydrogen peroxide is a versatile and environmentally friendly chemical with a wide variety of applications. It is commercially available as aqueous solution in various concentrations and grades.

Concentrations and grades
Risk phrases (50% to <70%)	R 8	Contact with combustible material may cause fire
	R 20/22	Harmful by inhalation and if swallowed
	R34	Causes burns
Risk phrases (70% and above)	R 5	Heating may cause an explosion
	R 8	Contact with combustible material may cause fire
	R 20/22	Harmful by inhalation and if swallowed
	R 35	Causes severe burns
Safety phrases	S 17	Keep away from combustible material
	S 26	In case of contact with eyes, rinse immediatly with plenty of water and seek medical advice
	S 36/37/39	Wear suitable protective clothing, gloves and eye/face protection

The most important data are summarized in the following table:
Parameter	units	H₂O₂ concentration
Content	% by wt.	30	35	50	60	70	87
Content	g H₂O₂ 100%/kg	300	350	500	600	700	870
Content	g H₂O₂ 100%/l¹⁾	333	396	598	745	902	1197
Content	Mol %	18.5	22.2	34.6	44.3	55.3	78.0
Active oxygen content	% by wt.	14.1	16.5	23.5	28.2	32.9	40.9
Density at 20 °C	g/cm³	1.111	1.132	1.196	1.241	1.288	1.376
Freezing point²⁾	°C	-26	-33	-52	-56	-40	-16
Boiling point (normal pressure)³⁾	°C	106	108	114	119	125	139
Total vapor pressure (30 °C)	10^-3; MPa	3.333	3.200	2.400	1.867	1.467	0.747
Total vapor pressure (30 °C)	Torr	25	24	18	14	11	6
H₂O₂ partial vapor pressure (30 °C)	10³ MPa	0.033	0.040	0.080	0.120	0.173	0.269
H₂O₂ partial vapor pressure(30 °C)	Torr	0.25	0.3	0.6	0.9	1.3	2.0

¹⁾ at 20 °C
²⁾ H₂O₂ solutions have a strong tendency to supercooling
³⁾ Extrapolated values because normally concentration and boiling point are continuously reduced through decomposition during heating