For example, C6H10 returns a number of results. This query returns both results that are an exact match, and results for monographs that include your specified molecular formula eg. C6H10O2. It is also possible to specify that the molecular Formula Search covers a range of molecular of Molecular formulae e.g. C10-12 H22 O2

You can choose to search for an Exact weight (boundary condition = 0) or over a range of molecular weights.

You can search The Merck Index* Online by specifying an exact boiling point or a range (in °C).

You can search The Merck Index* Online by specifying an exact melting point or a range (in °C).

You can search The Merck Index* Online by specifying a Log P value (the Acid dissociation constant) point or a range.

You can search The Merck Index* Online by specifying a Log P value (the Partition Coefficient) point or a range.

You can search The Merck Index* Online by specifying a particular density or a range.

You can search The Merck Index* Online by specifying a particular Index of Refraction or a range.

You can search The Merck Index* Online by specifying a particular Optical Rotation or a range.

You can search The Merck Index* Online by specifying an exact flash point or a range. You have the option of searching the data either in °C or °F.

Search by Absorption Max value, this field expects a wavelength that should be provided in nanometres (nm).

Search against toxicity (this may be either LC₅₀ or LD₅₀ data) specified in mg/kg, e.g. 375 and the range of your search can be narrowed or widened by altering the Boundary Conditions.