Identifiers | |
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ECHA InfoCard | 100.118.859 |
EC Number |
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Properties | |
Appearance | white to cream colored powder |
Density | 26.25 lbs/ft³ (bulk) |
Hazards | |
NFPA 704 (fire diamond) | |
Safety data sheet (SDS) | [1] |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Welan gum is an exopolysaccharide used as a rheology modifier in industrial applications such as cement manufacturing. [1] It is produced by fermentation of sugar by bacteria of the genus Alcaligenes. The molecule consists of repeating tetrasaccharide units with single branches of L-mannose or L-rhamnose. [2] In solution, the gum retains viscosity at elevated temperature, and is stable in a wide pH range, in the presence of calcium ion, and with high concentration of glycols. [3] [4] [5]