Jolly Bitulex Softboard is processed from cane fibre, the raw material tested and proven to provide the best resilience. Impregnated with Bitumen in various percentages, it is a perfect base material for expansion joint fillers. Jolly Bitulex Softboard is processed from cane fibre, the raw material tested and proven to provide the best resilience. Impregnated with Bitumen in various percentages, it is a perfect base material for expansion joint fillers.