Definition - A trade secret is any formula, pattern, device or compilation of information used in one's business, and gives him an opportunity to obtain an advantage over competitors who do not know or use it.
It may be a formula for a chemical compound, a process of manufacturing, treating or preserving materials, a pattern for a machine or other device, or even a list of customers.
In other words, the trade secret is proprietary information, that which the holder of the secret does not wish to be known to others, particularly his competitors.
In the context of an MSDS, a trade secret and "secrecy" have a very rigorous definition as defined by OSHA in Appendix D to the Hazard Communication Standard, 29 CFR 1910.1200.
Additional Info - When 29 CFR 1910.1200, the OSHA Hazard Communication Standard was being drafted, some manufacturers worried that the requirement to provide MSDS's would give away their "secret formulas" or proprietary information about their products.
Thus, Paragraph (i) of the Standard permits a manufacturer, importer or even employer to withhold the specific chemical identity of a material provided that all of the following apply:
-The claim of a "trade secret" can be supported (key point; more below).
-The MSDS states that the specific chemical identity is being withheld as a trade secret.
-The properties and effects of the hazardous chemical, including the PEL, TLV, or other designated exposure limit, is disclosed in the MSDS.
-The specific chemical identity is made immediately available to a treating physician or nurse in an emergency situation or to the physician, nurse, employee or designated representative under certain non-emergency situations; see Paragraph i(3) for detailed information.
http://www.ilpi.com/msds/ref/tradesecret.html
if someone could post the approp Regane MSDS