Wonder Fissure: Cracking Mechanism

Working Mechnism: Crack Formation

Upon filling of the pre-drilled holes with the mixed WONDER FISSURE slurry, reaction immediately starts to occur in the WONDER FISSURE. Upon reacting, the WONDER FISSURE starts hardening and expanding causing the material to develop cracks. The cracks generally appear within 3 to 20 hours after filling, depending on the temperature. These cracks spread further and become wider with time.

Reaction starts as soon as WONDER FISSURE is mixed with water causing it to expand and harden. When the WONDER FISSURE is packed into a hole in stone or concrete, it swells and exerts pressure on the hole-walls and thus fractures it.

The cracks appear within 45 minutes after filling, depending on weather, rock or concrete temperature. The cracks become wider with time. The ambient temperature in the material being cracked determines the reaction speed. The higher the temperature, the shorter the reaction time.

The time required for full crack formation in material at 30°C is about 6 - 8 hours. The lower the temperature, the longer the crack formation takes. The crack width for rock continues to increase with time and can become 10 - 30 mm (3/8" - 1 1/8") after several days, depending on free surface available. It is best to wait until WONDER FISSURE has worked to full depth before removing the rock, as premature removal at the first sign of a crack can hamper the leverage effect of WONDER FISSURE.

Cutting and Secondary Breaking

When the cracking gap is around 3 - 5 cm, you can carry out the further demolition work. After cracks initiate, secondary breaking is carried out with a hand-breaker, a pick-hammer, a giant hydraulic breaker, a ripper, etc. It is best to wait until the WONDER FISSURE has worked to full depth before removing rock or concrete since premature removal at the first sign of a crack hampers the leverage effect of WONDER FISSURE.


Type of breaking by WONDER FISSURE Secondary breaking required
Fragmentation Hammer, Power shovel
Crack Formation Hand breaker, Power shovel, Hydraulic breaker
Pre-splitting Combination of mechanical breaker or dynamite