mission Pressing construction deadlines Explosive usage prohibitions Cost reductions

GANSIZER solves all of these problems and needs

A savior that safely reduces construction times and costs

Non-explosive, low vibration, steam pressure cracking agent  Gansizer

Click here to make inquiries or request documents

Pressing construction deadlines

Consideration for nearby homes and buildings

Keeping down costs

Needs such as these are being felt in construction sites throughout the country.
Confronted by bedrock. Unable to use explosives. Construction periods dragging out. Safety. Cost reductions.

Now there’s a powerful ally for worksites facing tough conditions such as these!

Gansizer Steam Pressure Cracking Agent

GANSIZER, a non-explosive, low vibration, steam pressure cracking agent from Nippon Koki Co., Ltd., can be used not only for limestone and quarry excavation and civil works such as dams, tunnels, and land formation, but also in situations such as building scrapping-and-building and urban redevelopment, where there are vibration and noise restrictions to protect the surrounding environment. GANSIZER is a steam pressure cracking agent that efficiently cracks while meeting these vibration and noise restrictions, helping shorten construction times and reduce costs.

Not an explosive!

GANSIZER is a revolutionary cracking agent which cracks hard bedrock through steam pressure produced by chemical thermal decomposition. It contains no explosives, so it is not covered by the Explosives Control Act, and requires no troublesome usage permits. It can be used easily whenever you need it.

Cracks instantaneously!

GANSIZER is different from static cracking agents. It is used by connecting an ignition tool and performing chemical ignition, making it possible to complete crack work quickly and on the spot. There are no wait times. Work can be carried out smoothly, shortening construction times.

Low vibration! Safe!

GANSIZER doesn’t generate the shock waves that regular explosives do. It only produces 1/2 to 1/5 the vibration of conventional explosives. It is a highly safe cracking agent which can be used for cracking work near homes, buildings, and roads

Usage effectiveness evaluation by the New Technology Information System (NETIS) arrived at the following conclusions.

GANSIZER is not an explosive, but it can instantly crack objects, shortening construction times in comparison to conventional techniques.

GANSIZER offers the workability of explosives, but requires no usage permits, so it is effective for buildings for which the use of explosives is prohibited for security reasons.

Also solves issues faced by other cracking methods

Explosives are generally used as a large-scale civil work and cracking method, but various other methods have now been developed, such as cracking using large breakers, ripping to perform large-scale rock excavation in outdoor work, and rock breaking using hydraulic wedges. However, these methods have limited levels of efficiency and application scopes, creating construction time and cost problems. GANSIZER solves these problems.

User feedback

National road improvement work prime contractor
Our national road improvement work was performed adjacent to existing national roads, so we were unable to use blasting, and rock breaking took too long. We used GANSIZER to improve excavation efficiency, reducing both construction time and costs.

Levee removal work prime contractor
We considered performing our work using static fracture agent, but we went with GANSIZER instead. We had initially planned for 30 days for removal work, but we were able to finish in 10.

As seen on television, in trade papers, and other media!

Nikkei Construction “Hotline,” a publication of the MLIT Chubu Regional Development Bureau Meishikokudo Office Tunnels and underground

Safe, speedy, low cost crack within allotted construction periods.

A savior that safely reduces construction times and costs

Non-explosive, low vibration, steam pressure cracking agent

Click here to make inquiries or request documents

Examples of use in actual work sites!

GANSIZER is used in construction work ordered by Ministry of Land, Infrastructure, Transport and Tourism Regional Development Bureaus and individual prefectures!
It has been used in over 500 worksites!

  • Bedrock cracking
  • Boulder cracking
  • Reinforced concrete demolition
  • Tunnel excavation

Dangerous rock removal | Cutting | Road bed lowering | Trench excavation | Deep foundation excavation work | Concrete disassembly, and other rock and concrete cracking work

User feedback

Residential construction work prime contractor
We were working near homes, so we couldn’t use blasting because of the vibration and noise it produces, and the rock we were working with was hard, so using a breaker would take too long. With GANSIZER, we were able to crack hard rock without receiving any vibration or noise complaints from those living nearby.

Deep foundation excavation work prime contractor
We were working in a cramped site, so we couldn’t bring in heavy equipment, and it would take too long to break up hard bedrock using compact equipment. GANSIZER was a tremendous help, enabling us to perform cracking.

Used in restoration work following the Great East Japan Earthquake!

GANSIZER contributed to restoration work in disaster-struck areas by performing exceptionally in situations such as cracking levees which were knocked down and submerged as the result of the tsunami, and crack large boulders which fell due to the earthquake.

Can be used at sea!

Can be used on general roads!

User feedback

Levee disassembly work prime contractor
Using explosives underwater creates shock waves which knock out or kill fish, and cause concern to fisherman. Fish aren’t affected by GANSIZER use, so we feel secure using it.

[Technology is registered in the Ministry of Land, Infrastructure, Transport and Tourism's New Technology Information System (NETIS). (No.KT-990072-V)]

[Certified as follows in the Public Works Research Center's Civil Material Technology - Technology Review Certification Report (Technology Review Certification No. 0101). (excerpt from the certification)]

● GANSIZER produces a consistent level of cracking performance unaffected by the temperature of the location in which it is used (-15°C to +75°C). It is also unaffected by temperature, vibration, or shock while being transported, stored, or used.

● When used to perform cracking, GANSIZER produces roughly 50% of the ground vibration velocity as the amount of explosive which would produce an equivalent amount of cracking performance.

A savior that safely reduces construction times and costs

Non-explosive, low vibration, steam pressure cracking agent Gansizer

Click here to make inquiries or request documents

More about GANSIZER

Is GANSIZER an explosive?

GANSIZER is a non-explosive composition. Although it is not an explosive, it is used following essentially the same process used to perform blasting with industrial explosives (boring => charging => packing => wiring => rock scatter prevention => ignition => safety confirmation), making work speedy.

Is GANSIZER a static fracture agent?

No. GANSIZER is a product composed of a cylinder containing a cracking agent and a dedicated electrical ignition tool. It does not require the waiting time needed for static fracture agents to chemically react. Cracking is performed immediately when the GANSIZER is electrically ignited.

Does it produce vibration or noise?

GANSIZER produces between 1/2 to 1/5 the cracking vibration of explosives. It does not produce cracking sounds or shock waves like explosives, instead just producing a dull “thud.”

How can I buy GANSIZER?

We sell through supervisory contractor sales, so we (Nippon Koki Co., Ltd.) do not sell directly to customers who wish to use GANSIZER. GANSIZER is sold through supervisory contractors (primary designated operators) with which we have established business agreements. Please contact us for information regarding supervisory contractors near you.

Does the use of GANSIZER require usage permit applications to be filed with government offices, like explosive agents do?

GANSIZER does not fall within the scope of the Explosives Control Act, so no usage permit applications are necessary.

Are there any certifications or conditions necessary to use GANSIZER?

As a manufacturer, we require users of GANSIZER to possess some sort of explosives certification, and for someone who has attended “GANSIZER technical training,” whether offered by our company (Nippon Koki Co., Ltd.) or a primary designated operator (those who have received this training are called Technical Guidance Supervisors), to supervise use in the field. Please contact us or a primary designated operator regarding GANSIZER technical training.

Can GANSIZER be used outside Japan?

Please contact us if you are considering using GANSIZER outside Japan.

Is there any production rate information regarding the use of GANSIZER?

Estimation materials are available for determining GANSIZER production rates.
Production rates will vary depending on the content of the work being performed, so please contact us if you require production rate information. Responses will be provided via Japex Co., Ltd. (part of the Nippon Koki group), which is responsible for GANSIZER sales and technical service.

Gansizer Guidebook (technical materials)

  • GANSIZER Catalog> Download
  • GANSIZER Usage Vibration and Noise (June 2009 edition)
  • IC Multistage Igniter Catalog > Download
  • Usage Manual (Ver. 2.0)> Download
  • Main Usage Track Record (April 2008 edition)
  • New Comprehensive Technology Materials (Ver. 1.2)
  • Usage Case Collection
  • Latest Usage Case Example “Shinkansen Area Deep Foundation Excavation Work”
  • Estimation Materials (March 2002 edition)
  • New Usage Case Example “Performing Construction Using Multistage Ignition Tools - Slope Face Large-Scale Excavation”

* Always read the materials marked with a “” before using GANSIZER.

* Please contact us for the materials marked with a “


Cartridge size Model 28-6 Model 28-12 Model 28-24 Model 38-30 Model 38-75 Model 55-50 Model 55-100 Model 55-200 Model 65-300
Charge (g/cartridge) 60g 120g 240g 300g 750g 500g 1000g 2000g 3000g
Cartridge diameter (mm) φ28 φ38 φ55 φ65
Cartridge length (mm) 120 215 400 315 690 230 460 800 850
Main drill Handheld rock drills Tunnel jumbos Crawler drills
Standard bore diameter (mm) φ32 φ32(φ34) φ45 φ65 φ76 φ89

Note 1) Bore placement will vary by bedrock strength and cracking method. Please contact us by email when considering cracking design.

Note 2) Model 38-30 and Model 38-75 GANSIZER cartridges are not exclusively for tunnel usage. They can also be used for outdoor work, deep foundation work, and many other types of work by using suspended rock drills and attached drills (drills attached to hydraulic power shovels).


Type Instant igniter IC multistage igniter
For Model 28 (φ30) T type (φ38) A type (φ38)
Leg wire (m) 1.8 2.4 4.5 2.4 1 or 2 stage 4.5
3 or more stage 3.0
Leg wire color Red and white Red and white Red and white By stage By stage Green and white

Note 3) When using the IC multistage igniter with Model 55 or Model 65 cartridges a separate adapter (Model 55 adapter or Model 65 adapter) is required.

Note 4) Instant igniters can be ignited with standard blasting tools, but the IC multistage igniter must be ignited with the dedicated igniting tool. For details, see the “IC Multistage Igniter” promotional site.

State Granular (contained in a cartridge)
Specific gravity 1.07~1.25g/cm3
Ignition point 520°C or higher *1
Reaction speed (under testing conditions) 300m/s or less
Time to maximum combustion pressure 30~50ms
Sealed combustion pressure 3,000kgf/cm2
Volume of gas produced 330 liters/kg
Note) Contains some toxic gases, so ventilation must be provided when using underground
Heat produced by reaction 1,170kJ/kg *2
Ignition method Ignited remotely by blasting tool, multistage ignition tool, or MBS ignition tool
Packing Completely seal with wet sand, etc.*3

*1 No ignition within 1 minute when using Krupp ignition tester (temperature drop method)

*2 Theoretical values based on standard mixture

*3 When the GANSIZER cannot be inserted sufficiently deeply, consider sealing with quick-setting mortar cement, etc.

*4 GANSIZER is classified as a Type 2 Hazardous Material Category 2 Flammable Solid under the Fire Service Act.。

GANSIZER is a registered trademark of Nippon Koki Co., Ltd.

The solution to your construction time, safety, and cost problems!

A savior that safely reduces construction times and costs

Non-explosive, low vibration, steam pressure cracking agent

Click here to make inquiries or request documents

Nippon koki Co.,Ltd.All Copyright Reserved 2013