This research aims to develop the gypsum refractory board mixed with corn leaf coir. The 5 ratios of gypsum plaster: corn leaf coir: tap water: sodium silicate are equal to 1: 0: 1: 0.03 1: 0.100: 1: 0.03 1: 0.150: 1: 0.03 1: 0.200: 1: 0.03 1: 0.250: 1: 0.03 และ 1: 0.300: 1: 0.03 by weighted. The gypsum refractory boards were produce by casting in normal temperature (30 – 35 degree of Celsius). The properties testing of gypsum refractory board mixed with corn leaf coir followed the TIS 219-2009 standard (gypsum plasterboard) included: breaking load nail pull resistance deflection water absorption density and thermal conductivity coefficient. From the results 1: 150: 1: 0.03 is the most suitable ratio of gypsum refractory board mixed with corn leaf coir. This developed gypsum refractory boards can reduce the quantity of corn leaf waste and get the good thermal insulation gypsum refractory board products.

The objectives of this research are to study the product development of light weight concrete wall board mixed with coconut leaf waste for small community enterprise to find the suitable coconut leaf waste mixed ratio with cement river sand coconut leaf waste water and catalyst accelerator at 1:0.4:0.13:0.33:0.03 ratio. CC13 (1:0.13) at 28 days has density 2266 kg/m3 bending resistance 3.05 MPa heat conduction efficiency 0.236 W/m-K. The coconut leaf waste can absorb water inside and the cement board can attach to the concrete wall easily. Suitability to make the big concrete wall.