Phenol: formaldehyde ratio was varied in the synthesis of phenol- formaldehyde resin and used to prepare the composites. These composites were then evaluated for their mechanical strength on the basis of tensile strength, compressive strength and wear resistance. Composite with better strength was characterized by IR, SEM, XRD, TGA/DTA and further studies were carried out for its physico-chemical and mechanical properties like viscosity, modulus of rupture (MOR), modulus of elasticity (MOE) and stress at the limit of proportionality (SP) etc .
Kaith, B. S., & Chauhan, A. (2012). Synthesis, Characterization and Mechanical Evaluation of the Phenol-Formaldehyde Composites. E-Journal of Chemistry, 5(s1), S1015–S1020. https://doi.org/10.1155/2008/328426