ANFO is a commonly used and cost effective dry hole explosive. ANFO is a free flowing blend of 94% porous prilled ammonium nitrate and 6% fuel oil by weight. ANFO is suitable for use in most dry hole blasting applications.


The benefits of ANFO are:

  • Excellent safety characteristics.
  • High blasthole loading rates.
  • Consistent quality.
  • ANFO is a cost efficient explosive which allows for competitive blasting costs with an excellent level of blasting outcomes in suitable rock types.
  • ANFO provides high levels of heave energy combined with the efficient charge distribution throughout the blasthole.


ANFO is manufactured in Synegex Mobile Processing units and augered into blast holes. Generally ANFO has an augered density in the range of 0.80 to 0.85 g/cm3. The bulk density of ANFO depends on the density of the Ammonium Nitrate prills. ANFO readily absorbs moisture and deteriorates on contact with water hence it has no water resistance making it suitable for dry conditions only. Synegex uses high quality locally manufactured porous prilled Ammonium Nitrate for ANFO manufacture.


(Stated at 100MPa)

Properties ANFO
Energy¹ (MJ/kg) 3.77
Relative Weight Strength¹ 100
Relative Bulk Strength¹ 100
Normal Density Range² 0.8-0.85
Minimum Hole Diameter 76
Water Resistance³ 0
Sleeping Time in Dry Holes4 4 Weeks
  1. Energy values, Relative Weight Strength and Relative Bulk Strength are calculated using an in-house thermodynamic code. This traditional way of calculating energy is directly related to density and does not take into account the distribution of energy.
  2. A number of factors affect the final product density including in-hole conditions, ammonium nitrate density, matrix density, ammonium nitrate fines and the amount of air entrainment.
  3. Water resistance is a qualitative measure with 0 being none, 3 being good and 5 being excellent.
  4. Sleep times are dependent on in-hole water conditions. In general the longer a particular product sleeps the poorer blasting outcomes. Holes with dynamic water should be loaded and shot immediately, while in extreme dynamic water conditions extra precautions may be required. The sleep time in non-reactive rock types should never exceed 4 weeks.


UN No: Shipping Name: Class:
0082 Explosive, Blasting, Type B 1.1D

Recommendations for Use

ANFO is delivered into the blast hole by being augered from the MPU. ANFO should not be used in ground containing pyritic or other reactive material. Incorrect use of this product may result in high levels of post blast fume.

Priming Requirements

In holes with a diameter equal or less than 127mm the minimum primer required is a 150gm cast booster. In holes with a diameter greater than 127mm the minimum primer required is a 400gm cast booster. It is recommended that an additional cast booster be used every 15 metres of column charge to reduce the risks associated with explosive column disruption.


ANFO is only available in bulk, delivered through bulk MPU delivery systems.


Information regarding this product is available from the relevant Synegex product MSDS.


All explosives are classified as Dangerous Goods and must be transported in accordance with relevant State and Commonwealth regulations. ANFO cannot be transported on a public road in the MPU. ANFO is batch manufactured when loaded into the MPU from non-explosive ingredients.

Storage & Security

All explosives are classified as Dangerous Goods and must be stored and secured in accordance with the relevant State and Commonwealth regulations.


Warning and Disclaimer:
To the best of Synegex Holdings knowledge the information contained in this data sheet is accurate at the time of issue. The conditions under which this information is used is outside the control of Synegex Holdings and each user should review and is responsible for being aware of the product applications in the specific context of the intended use. Synegex Holdings is not responsible for damages of any nature resulting from the use of or reliance upon the information in this data sheet. To the extent to which Synegex Holdings is able, all conditions, representations and warranties, whether express or implied, not required to be binding by statute are excluded.

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