A low viscosity grade guar gum has been developed by two techniques i.e. gamma irradiation and H(2)O(2) treatment. The desired viscosity is achieved by controlling the quantity of hydrogen peroxide solution or the gamma-irradiation dose. The viscosity of 1% guar gum was reduced from 3240 cps to 116 cps using 10% H(2)O(2) Solution (50% v/v) and from 3203 cps to 222 cps using 6 kGy gamma-irradiation dose. The reduced viscosity was stabilized by adding 0.5% solution of formaldehyde (37% v/v) or by using 0.5% cobalt naphthenate. The low viscosity grade guar gum powder and the solutions stabilized with cobalt naphthenate or formaldehyde could be stored for long periods without loss of viscosity. The reduced viscosity guar gum is used for grouting stabilization of sand for construction works across desert.