Assertion: polymer's number | /r/HasProperty | utilised as urea formaldehyde
Facets:
value: for encapsulation of core
type: PURPOSE
Source sentences:
text: , For encapsulation of core like as mentioned above, number of shell materials have been utilised such as phenol formaldehyde, urea formaldehyde  &, dendritic or PAMAM, melamine formaldehyde, etc.