Welan gum

Welan gum
Identifiers
ECHA InfoCard 100.118.859
Properties
Appearance white to cream colored powder
Density 26.25 lbs/ft³ (bulk)
Hazards
Safety data sheet
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oilHealth code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
1
1
0
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

  1. ↑ US patent 5004506, "Welan gum in cement compositions", issued 2 April 1991, assigned to Merck & Co., Inc.
  2. ↑ "CP Kelco Welan Gum". CP Kelco. Retrieved 17 Sep 2010.
  3. ↑ "Welan gum". Colltec. Retrieved 17 Sep 2010.
  4. ↑ "Welan gum". Fritz Industries. Retrieved 17 Sep 2010.
  • Dea, Ian C M (1989). "Industrial polysaccharides" (PDF). Pure and Applied Chemistry. 61 (7): 1315–1322. doi:10.1351/pac198961071315.


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