Inorganic thermal insulators are commonly used to improve energy efficiency. However, environmental and health aspects of their
production until the end of life have been increasingly concerned. Agricultural wastes including rice straw, rice husk and corn cobs
are abundant in Thailand and converted into value-added products such as thermal insulation materials offers a viable recycling
opportunity as the ecological burden of a product has now become a widely-discussed issue. In this paper, global warming potential
impact of thermal insulation materials made from agricultural wastes; rice straw, bagasse, coconut coir and oil palm fibre, were
assessed by using IPCC 2007, while Eco-indicator 99 was applied to evaluate the endpoint impact. Moreover, those impact of three
different forming processes including (i) hot-pressing, (ii) using concentrated latex as a binder and (iii) using mixed concentrated
latex-chemicals as a binder were compared. The physical properties of the insulation pads were tested to identify qualities such as
density, water absorption, thickness swelling, fire resistance and thermal conductivity. The eco-efficiency of the insulation pads
was also measured the performance and environmental impact and compared with commercial thermal insulators. Results revealed
that thermal insulators formed by mixed concentrated latex-chemicals had the lowest thermal conductivity, while those formed by
hot-pressing had the highest. Thermal conductivity of the four agricultural waste thermal insulation materials varied between0.042‒
0.087 W/mK. Insulators made from rice straw caused the greatest environmental impact followed by those made from bagasse,
coconut coir and oil palm fibre respectively. The result of eco-efficiency of oil palm fibre insulator, formed by mixed concentrated
latex-chemical, was best presented and closed to the eco-efficiency of commercial thermal insulators.