Durable agglomerates created from the straw by curling it in the cylindrical briquetting machine, intended to the combustion in low-power boiler rooms, should be of large cohesion. This feature of straw-briquettes is also important for the necessity of their long-lasting storage and the transportation from the place of their storage to the boiler room. This feature is determined as a durability of briquettes. Under this notion one ought understand briquette's resistance on the uncoiling and spatting. A numerical quantity of this resistance is the coefficient of the durability of the briquette. To the factors having the influence on the durability of briquettes belong the degree of their condensation as well as irrational values such as: the manner of their displacement and real charges caused by different conditions of their transportation. The work contains the findings concerning the influence of the consistence of briquettes on their durability.