A hartree (or the Hartree Energy) is the atomic unit of energy and is defined as 2R∞hc, whereR? is the Rydberg constant, h is Planck's constant c is the speed of light in a vacuum. This is clearly not something you'd find on an MSDS.
Interactive Learning Paradigms Incorporated ILPI (Knowledge at the Speed of Light), The MSDS Hyper Glossary (Home Page of the Material Safety Data Sheet Hyper Glossary), ILPI, NJ, USA 2011. http://www.ilpi.com/msds/ref/index.html, (MSDS - Amer) {448}