## 1 Introduction  
Globally, the increase of organic and inorganic waste caused by increasing human population growth as well as their lifestyle. Discarded waste such as waste glasses give a negative impact on the environment. For instance, the discarded cathode ray tube (CRT) panel from the electronic component and soda-lime-silica glass from the automotive industry are polluted with heavy metals [1, 2]. To overcome this problem, both raw materials are utilized for making valuable materials such as manufacturing stoneware tiles, production of concrete blocks, fabrication of glass-ceramics materials, and the manufacture of foam glass-ceramics [3]. There is a wide sector application used to insulate the materials such as the construction industry, biochemistry industry, material engineering, military security, etc. [4]. Foam glass-ceramic is a thermal insulation material that has attracted much attention nowadays, function to retard heat flow due to its properties such as high thermal resistance. Generally, the foam glass is a solid bulk material, shaped by mixing the glass powder and foaming agent and then undergo a sintering process to form a porous structure. After the softening point temperature of the glass is reached, the solid phase turns to viscous liquid and facilitates the bubbles to grow inside the glass melt, hence foam formation has occurred when solidified the glass melt. The glass can provide an amorphous phase that led to better thermal insulation material's appearance. The pores were generatedinside the body glass from the decomposition of the foaming agent either decomposition reaction or oxidation-reduction reaction to produce CO\({}_{2}\) gas. There was a previous research use manganese oxide as an oxidizing agent meanwhile silica carbide as a carbon-containing [5]. For decomposition reaction, the raw materials are from commercial calcium carbonate, calcium carbonate from mollusk animal, eggshell and sodium carbonate [6; 7; 8; 9]. The soda-lime-silicate (SLS) glass from bottle glass waste is reused in this research to fabricate foam glass-ceramics. SLS glass becomes great attention compared to conventional glass due to its characteristic in terms of optical and mechanical properties. Moreover, the use of SLS glass waste as an alternative way to get a source of SiO\({}_{2}\) associated with glassy appearance [10]. Furthermore, the softening point of this glass -700 \({}^{\circ}\)C [11]. Eggshell (ES) was used as a foaming agent of decomposition of calcium carbonate to carbon dioxide and calcium oxide. ES is obtained from urban waste (household, bakery, restaurant, etc.). There is an abundance of eggshells in landfills as Malaysian consume 20 million eggshells daily [12]. The waste of eggshells would give a negative impact on the environment because it can attract animals such as rats and mice to accumulate around eggshell wastes. Thus, reused of waste materials (SLS and ES) to wealth technology can be achieved in this study as well as the prevention of the greater bulk volume of wastes in landfill sites. Moreover, a few previous studies are using waste glass and ES as a source of calcium carbonate to fabricate foam glass-ceramics [7; 13]. The feature of final product foam glass-ceramics depends on the composition of foaming agent, the particle size distribution of glass powder and foaming agent powder, sintering temperature and sintering duration. Decreasing in density as well as the thermal conductivity of foam glass-ceramic is influenced by the porosity. Increasing porosity is achieved by containing 3 wt % of eggshell and an excessive amount of ES contribute to the reduction in porosity [7]. Furthermore, the other previous study found that the apparent density of foam glass is 2.46 g/cm\({}^{3}\) at 5 wt % of ES associate with a fluorescent lamp as a glass matrix [14]. Previous work has revealed the crystal form in the glass at 10 wt %-18 wt % of the foaming agent while a low percentage of calcium carbonate shows an amorphous nature [6].