Synthesis and Morphology of Flexible Polyurethane Foams Containing Neem Oil and Clove Powder

Table 3

Physical defects of foams under different isocyanate indices.

Foam ID	Foams made with isocyanate index (103)					Foams made with isocyanate index (108)
	Nature of cells	Splits	Collapse of foam after rising	Presence of cavities	Blow holes	Nature of cells	Splits	Collapse of foam after rising	Presence of cavities	Blow holes
PU-0	Open cells	No splits	No collapse	No cavities	No holes	Open cells	No splits	No collapse	No cavities	No holes
PUC-1	Closed	N/A	Collapse	N/A	N/A	Open cells	No splits	No collapse	No cavities	No holes
PUC-2	Closed cells	N/A	Collapse	N/A	N/A	Open cells	No split	Partial collapse	Cavities	Holes seen
PUN-1	Closed cells	N/A	Collapse	N/A	N/A	Open cells	No split	No collapse	No cavities	No holes
PUN-2	Closed cells	N/A	Collapse	N/A	N/A	Open cells	Partial split	Partial collapse	Cavities observed	Holes seen
PUNC-1	N/A	N/A	N/A	N/A	N/A	Open cells	No splits	No collapse	No cavities	No holes observed
PUNC-2	N/A	N/A	N/A	N/A	N/A	Open cells	No splits	No collapse	No cavities	No holes observed
PUNC-3	N/A	N/A	N/A	N/A	N/A	Open cells	No splits	No collapse	No cavities	No holes observed