Pasteur red is also called French red. Like Champagne, it is a mixed population strain. It was developed in Bordeaux, France. It is meant for red wines because it is tolerant to heat and sulfur dioxide and hardly ever causes stuck fermentation. The red wines it is usually used for are Cabernet Sauvignon, Merlot and Zinfandel. Temperature range is 64-86°F, low flocculation, and alcohol is 16%.
A strain of Saccharomyces cerevisiae, has been derived from the collection of the Institute Pasteur in Paris. It is a strong, even fermenter that produces full bodied reds. This yeast encourages the development of varietal fruit flavors, balanced by complex aromas, especially when using grapes of the Cabernet family. It may be necessary to cool the fermenting must to prevent unwanted temperature increase. This yeast is reported to give character to less robust red grapes, or those picked before optimum development.
Note: Formally called Red Star Pasteur Red