strength to decrease. According toKyaw, Yu, Cheow, and Dzulkifly(1999), the linear expansion of the fish cracker was highest when the texture of the gel was the hardest.During frying, the crackers expand into a low density porous product. The linear expansion ratio (LER) is one of the important quality parameters of these crackers. The LER of the fried crackers with different substitution levels of GBF ranged from 80 to 114% inFC and 94-188% in CC. It has been reported that most commercial FC show a wide range of linear expansion which is within 38-145%(Nurul et al., 2009). Porosity and bulk density, which consider expansion in all directions, are the other two indices quantifyineg th extent of puffing. Porosity and crispness decrease significantly with increasing GBF substitution level while bulk density increases with increasing GBF substitution level. Generally higher expansion accompanies greater porosity; higher crispness of dried snacks is preferred by consumers. This indicates that use of GBF degrades somewhat the textural properties of these crackers. The weak gel strength is assosiated with a low LER, crispness, porosity ratio and high bulk density.