Guar Gum 3 : A water-soluble plant mucilage obtained from the ground endosperms of Cyanopis tetragonoloba which reduce the friction drag of water on metals; it is used to coat the interior of fire hose nozzles
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}