Composite Compressive strength   Force (Newton) Compression (mm) Phenol-formaldehyde-r-PF 700.0 0.90 H. sabdariffa-r-PF 900.0 1.50 Hs-g-poly(AN)-r-PF 905.0 1.50 Hs-g-poly(AN-co-MA)-r-PF 915.0 1.70 Hs-g-poly(AN-co-BA)-r-PF 910.0 1.70 Hs-g-poly(AN-co-AA)-r-PF 880.0 1.50 Where -r-PF refers to reinforced Phenol-formaldehyde.

Table 5: Compressive strength in graft copolymers reinforced P-F composite vis-à-vis P-F resin.