Composite Strength Test
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(AN)-r-PF 67.00 660.80 54.56 69.00
Hs-g-poly(AN-co-MA)-r-PF 75.00 736.96 67.00 76.00
Hs-g-poly(AN-co-BA)-r-PF 73.60 687.44 69.76 72.00
Hs-g-poly(AN-co-AA)-r-PF 66.00 648.40 55.00 69.00
Where -r-PF refers to reinforced Phenol-formaldehyde.
Table 7: Mechanical studies of graft copolymers reinforced P-F composite vis-à-vis P-F resin.