What is BRISTAR?

BRISTAR is a soundless and safe demolition agent which is quite different from ordinary demolition agents such as explosives and dangerous materials. It does not cause any fly rock, noise, ground vibration, gas, dust or any other environmental pollution when used properly.

As requirements for demolishing rock and reinforced concrete in construction increase in tight quarters, the use of explosives and explosive agents is becoming more restricted as far as safety and environmental pollution problems are concerned. BRISTAR is the solution.

When BRISTAR is mixed with an appropriate quantity of water and poured into cylindrical holes drilled in rock or concrete, it hardens and expands. BRISTAR cracks the matter to be demolished which then can be easily removed with a pick breaker, pneumatic breaker, excavator, etc.

There are currently 4 grades of BRISTAR on the market designed for various temperature ranges (shown in Table 1 and Fig. 1) of material to be cracked. Since a chemical reaction of BRISTAR depends on temperature, use the proper type of BRISTAR listed in Table 1.

I. BRISTAR IS A SAFE SUBSTANCE

BRISTAR is not controlled by any legal regulation such as explosives and explosive agents, etc. Qualified persons are not required for handling. Demolition can be easily and safely performed anywhere.

II. BRISTAR IS A SOUNDLESS CRACKING AGENT

Unlike the existing methods of demolition, BRISTAR does not make any noise, vibration, fly rock, dust or gas. Rocks and reinforced concrete may be demolished safely without environmental pollution. Furthermore, BRISTAR'S expansive stress continues even after crack initiation, the crack opening distance becomes wider as time passes.

III. BRISTAR HANDLES EASILY

No lid (or cap) is necessary after BRISTAR is poured into a hole of rock or reinforced concrete, nor is tamping required as with explosives. BRISTAR exerts its strength in a short time. Due to BRISTAR'S strong adhesion and frictional resistance to inner surface of the hole, spurs due to heat-generation (blown-out shot) do not occur when used within the parameters as noted in the conditions. The expansive stress along the hole depth is almost constant except for that near the entrance of the hole. Generally the expansive stress loss from the hole entrance has little effect on the demolition work when hole depth is long.

IV. BRISTAR HAS AN EXPANSIVE STRESS OF MORE THAN 6000 t/m²

Generally, the compressive fracture stress of rocks is 1000 to 2000 kg/cm² and that of concrete 150 to 500 kg/cm². However, the tensile fracture stress is very small, i.e., it ranges from 40 to 70 kg/cm² in concrete, respectively. Since demolition by using BRISTAR is based on a fracture due to a tensile stress, all kinds of rocks and concrete can be cracked and broken by using BRISTAR when appropriate holes are properly drilled.