Hydrolyzes the glucosidic bonds of unbranched Glc residues in tamarind seed xyloglucan, producing XXXG, XLXG, XXLG and XLLG. Has low activity on carboxymethylcellulose, lichenan,hydroxyethylcellulose and glucuronoxylan, and no activity on xylan, polygalaturonic acid, wheat arabinoxylan, rhamnogalacturan, curdlan, laminarin, galactomannan, galactan, arabinan and pachyman or amorphous cellulose. Optimum pH is 6.4 with tamarind seed xyloglucan as substrate. Retains 50% of its activity between pH 5.7 and 7.8. Optimum temperature is 75 degrees Celsius. Retains 25% of its activity after incubation at 90 degrees Celsius for 30 minutes. Belongs to the glycosyl hydrolase 74 family.