Registration Dossier

Physical & Chemical properties

Vapour pressure

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Vapour pressure:
0.058 Pa
at the temperature of:
25 °C

Additional information

A vapour pressure was estimated using structure activity relationships models developed by the U.S. Environmental Protection Agency and Syracuse Research Corporation (EPIWIN, v. 3.10,US EPA and Syracuse Research Corporation, 2001). The vapour pressure was estimated to 5x10‑12Pa (Staples, 2001).

A much higher value of 0.047 Pa at 20°C was extrapolated from results obtained by isoteniscope (method ASTM D2879) at temperatures ranging from 125 to 375 °C (Phoenix_Chemical_Laboratory, 1997). These measured values are displayed below.

Vapour pressure data for TNPP(Phoenix Chemical Laboratory, 1997)

Temperature °C

Vapour Pressure (Pa)

125

22.7

150

65.3

175

160

200

373

225

747

250

1533

275

2800

300

4666

325

8133

350

15330

375

65330

 

A strong relation between the temperature (1/T) and the vapour pressure is found. Excluding the last value measured at 375°C, the plot of the above results gives a linear regression with a good reliability. Vapour pressures of respectively 0.039 Pa and 0.058 Pa at 20°C and 25°C could be derived from this equation.