Table 7 | MOR, MOE, SP and Hardness studies..

Composite	Strength Test
Composite	MOR (N/mm²)	MOE (N/mm²)	SP (N/mm²)	Hardness (HRB)
Phenol-formaldehyde	43.20	496.12	38.40	Brittle
H. sabdariffa-r-PF	69.99	614.40	57.60	67.00
Hs-g-poly(EA)-r-PF	82.04	898.56	74.24	75.00
Hs-g-poly(EA-co-2VP)-r-PF	72.80	625.99	64.78	70.00
Hs-g-poly(EA-co-AM)-r-PF	87.96	789.80	76.56	82.00

where, -r-PF refers to reinforced Phenol-formaldehyde

Table 7: MOR, MOE, SP and Hardness studies of graft copolymers reinforced P-F composite vis-à-vis P-F resin.

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