A Review of the Flammability Factors of Kenaf and Allied Fibre Reinforced Polymer Composites

Table 1

Flame classification [27].

Classification	Spread of flame at 1.5 mins		Final spread of flame
	Limit (mm)	Limit for one specimen (mm)	Limit (mm)	Limit for one specimen (mm)
Class 1	165	165 + 25	165	165 + 25	Very low rate
Class 2	215	215 + 25	455	455 + 45	Low rate
Class 3	265	265 + 25	710	710 + 75	Medium rate
Class 4	Exceeding the limits for class 3				Rapid rate