Question

how does a plane removes its resins and gums ?

Answer 1

Resin Constituents
Resins can be classified as terpenoid or phenolic resins based on their constituents. Terpenoid resins contain terpenoid compounds such as the 10-carbon monoterpenes, sesquiterpenes (C15), diterpenes (C20), and triterpenes (C30) [93]. Phenolic resins contain compounds such as cinnamic acid, a simple C9 phenolic compound also referred to as phenylpropane, lignans, common dimeric phenylpropanes, and flavonoids [93]. The flavonoids are among the most bioactive groups and exist as water soluble glycosides or lipophilic aglycones. Di- and tri-terpenes are nonvolatile components of resins, while mono- and sesquiterpenes are found in the volatile fraction in most plant resins [98–100]. Conifers only produce internally secreted terpenoid resins, whereas angiosperms produce both terpenoid and phenolic resins, which may be secreted internally or on the surface of plants. Classification of resins is also aided by the fact that diterpenoids and triterpenoids are not found together in the same resins.
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