Chapter one of Advances in Materials Science Research. Volume 38, critically scrutinizes various recycling techniques implemented in the current scenario for the polyvinyl chloride based products. The second chapter focuses on the nanocomposite of an important type of thermoplastic polyvinyl chloride. Carbon nanomaterials have gained significant research interest as polymer reinforcement. polyvinyl chloride/nanocarbon nanocomposites possess excellent electrical conductivity, thermal stability, glass transition temperature, strength, toughness, modulus, and other physical properties. The authors of the following chapter highlight the essence of the flux growth method including fundamental aspects for crystal growth in solutions, choice of flux growth, and environmental applications to ion exchangers. Next, an eigenvalue-based technique for the characterization of a class of coaxial-line-to-waveguide adaptors that are used for material characterization is presented. The goal of the penultimate section is to investigate of magneto-thermoelectric effects in porous semiconductors. Thermoelectric and magneto-thermoelectric effects in porous materials possess very interesting improved properties compared to the bulk counterparts. In the closing chapter, the authors review different ways to induce and modulate porosity in non-cordierite honeycomb-type materials, based both in our own experience and that from other authors reviewing literature to date