§219.110. Vapor Pressure of Organic Material or Solvent

a)         If the organic material or solvent consists of only a single compound, the vapor pressure must be determined by ASTM Method D2879-86 (incorporated by reference in Section 219.112 of this Part) or the vapor pressure may be obtained from a publication such as:  Boublik, T., V. Fried and E. Hala, "The Vapor Pressure of Pure Substances," Elsevier Scientific Publishing Co., New York (1973); Perry's Chemical Engineer's Handbook, McGraw-Hill Book Company (1984); CRC Handbook of Chemistry and Physics, Chemical Rubber Publishing Company (1986-87); and Lange's Handbook of Chemistry, John A. Dean, editor, McGraw-Hill Book Company (1985).

 

b)         Except as provided in subsection (d), if the organic material or solvent is in a mixture made up of both organic material compounds and compounds which are not organic material, the vapor pressure must be determined by the following equation:

 

 

where:

 

Pom	=	Total vapor pressure of the portion of the mixture which is composed of organic material;
n	=	Number of organic material components in the mixture;
i	=	Subscript denoting an individual component;
Pi	=	Vapor pressure of an organic material component determined in accordance with subsection (a);
Xi	=	Mole fraction of the organic material component of the total organic mixture.

 

c)         If the organic material or solvent is in a mixture made up only of organic material compounds, the vapor pressure must be determined by ASTM Method D2879-86 (incorporated by reference in Section 219.112) or by the above equation.

 

d)         For hand-wipe cleaning solvents used at aerospace facilities subject to Section 219.219(g)(2), the composite vapor pressure of a cleaning solvent consisting of multiple components must be determined by the following equation:

 

 

where:

 

PPc	=	Composite vapor pressure of the cleaning solvent in mmHg at 20 °C;
n	=	Number of components in the cleaning solvent;
i	=	Subscript denoting an individual VOM-containing component;
j	=	Subscript denoting an individual non-VOM component;
Wi	=	Weight of a VOM-containing component in grams;
Wj	=	Weight of a non-VOM component in grams;
Ww	=	Weight of water in grams;
MWi	=	Molecular weight a VOM-containing component in grams per gram-mole;
MWj	=	Molecular weight of a non-VOM component in grams per gram-mole
MWw	=	Molecular weight of water in grams per gram-mole;
VPi	=	Vapor pressure of a VOM-containing component in mmHg at 20 °C.

 

(Source:  Amended at 45 Ill. Reg. 3553, effective March 4, 2021)