Welan gum
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(Redirected from Welan)
| Identifiers | |
|---|---|
| 96949-22-3 | |
| Properties | |
| Appearance | white to cream colored powder |
| Density | 26.25 lbs/ft³ (bulk) |
| Vapor pressure | {{{value}}} |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
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. In solution, the gum exhibits viscosity retention at elevated temperature, and is stable in a wide pH range, in the presence of calcium ion, and with high concentration of glycols.[2][3][4]
See also
References
- ↑ US patent 5004506, "Welan gum in cement compositions", issued 2 April 1991, assigned to Merck & Co., Inc.
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External links
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