• For effective use and to obtain optimum results, a controlled trial of Expando is recommended. 
  • Secure the site to ensure that the material, once cracked, does not damage or harm surrounding property or persons.When using EXPANDO with highly absorbent materials like concrete, dampen the holes before pouring; however make sure that there is no standing water.
  • To accelerate breaking time position large diameter holes together
  • Make sure the holes are clean without water and residue.
  • Pour fresh EXPANDO into holes within 10 minutes after mixing.
  • Do not mix more than two bags (10 kg) for each lot at a time.
  • The feeding depth should be 100% of the pre-drilled holes.
  • Do not plug the holes after filling
  • EXPANDO can only be used in holes and will not work in existing cracks of stones or concrete
  • Never fill glass or metal containers with EXPANDO mixture, or any container which widens towards the bottom. The pressure will shatter the container.
  • In the unlikely event EXPANDO begins to steam in the mixing container, add some water to dilute the mixture and throw it away to an open surface.
  • For best results it’s important to take into account air ambient and internal material temperature of the materials to be broken.


  1. SCA I Object temp 20 - 35 degrees Celsius
  2. SCA II Object temp 10 - 25 degrees Celsius
  3. SCA III Object temp 0 - 15 degrees Celsius


  • In summer fill holes at the end of the day to allow cracking overnight
  • In summer cover filled holes from direct sunlight using a tarp or damp hay to provide shade.



What size holes do I need to drill?

  • Drill holes 28-40mm in diameter


How deep do I drill?

  • Drill to 80-90% of the depth of the materials – do not go through. Hole depth must be a minimum of four times the diameter of the hole.


How far apart should I drill the holes?

  • See diagram below


  • The spacing, length (or depth) angle and diameter of the drill holes will be determined by the properties of the material to be removed and may require adjustment when areas of different hardness are encountered in the same rock body.


  • Following are examples of hole patterns for different situations and are to be used as a guide only.


  • It is recommended that a test pattern be trialled to ascertain the quality of the material to be demolished.






Removal of a toe rock







Bench CutNote:

High faces may need to be cut in several layers.


Table 1 : Bench and Toe Cut

(Remove toe before starting bench cut).

Diameter (d)          28mm – 40mm

Spacing (s)              300 – 500 mm

Height (h)               100% (+ 5% if flatter base required)

Angle (<)                 Parallel to free face







Shallow Trenching







Deep Trenching







In thin materials holes should be angled between 45 and 60 degrees for greater breaking effect.






How much EXPANDO will I use?


32mm Drill x 1 meter deep hole = 1.3kg Expando

34mm Drill x 1 meter deep hole = 1.5kg Expando

38mm Drill x 1meter deep hole = 1.8 kg Expando


Before drilling consider the maximum broken rock or concrete size you can safely maneuver.


The following are some estimated weights per M2 of each material.

Sandstone 1M2 =2.2 to 2.7 Tonne

Granite =3 Tonne

Limestone 1M2 = 2.4 Tonne

Concrete = 2.4 Tonne


How should I design my hole patterns?


Consider the maximum broken rock or concrete you can safely manipulate. Then plan out your hole pattern.


Available Types of Expando


Chemical reaction of Expando depends on the temperature of the breaking object.


SCA I 20°C - 35°C

SCA II 10°C - 25°C

SCA III 0°C - 15°C


The reaction time of Expando to crack stone varies from 24 hours to 72 hours, depending on the cracking object, material, hole design and temperature. Generally speaking, within the temperature scope of each type, the higher the temperature of the object and the closer together the holes, the quicker the object will crack (otherwise, the opposite will occur).

expando NZ

This is a mockup. Publish to view how it will appear live.