**Acknowledgements**

The work was integral part of Doctoral research study at Jadavpur University and at CSIR-Central Glass & Ceramic Research Institute without any financial grant. Prof. Indranil Manna, former Director of CSIR-Central Glass & Ceramic Research Institute had kindly permitted to pursue the doctoral research work, and Prof. Subhasis Neogi and Dr. Arup Ghosh had acted as Supervisor and Co-Supervisor for the work. Mr. Debasish Chowdhury had helped in carrying out U-value tests and Mr. Subrata Mistry had co-operated tirelessly in preparing around 200 samples. Mr. G. Debnath, Mrs. M. Kanu, Mrs. Swati Samanta, Mr. Nitai Dey, Mr. Ashok Mndal of CSIR-CGCRI had helped in material characterization and Mr. Bidhan Choudhury and Dr. Chandana Patra of CSIR-CGCRI had helped immensely in collection of some reference articles.
