Treated Poles

Pressure, Creosote & CCA Treated Timber Pole Products

World Hardwood grows and harvests their own timber poles. These timber poles are processed to produce our unique brand of hardwood treated poles. World Hardwood supply to South Africa and to the African market.

Creosote is the most widely used wood preservative in our industry. World Hardwood uses the full-cell method to treat cross arms, transmission poles, and building and fencing poles.

Creosote Treatment Process

The full-cell process is as follows:

  • Treatment Vessel is charged with our timber poles and the treatment vessel is sealed.
  • A vacuum is drawn and maintained for an adequate period.
  • Without increasing the pressure, the preservative is introduced at the appropriate temperature.
  • Allow the cylinder to fill to capacity.
  • Apply hydraulic pressure and maintain this pressure (approx 10bar) until the required absorption is attained.
  • Release the pressure and pump surplus preservative from the treatment vessel.
  • Apply a final vacuum to “dry poles” of excess preservative.
  • After treatment, treated poles are laid out for final inspection where the poles are inspected for defects and drilled to check the depth of penetration. Acceptable treated poles are then tagged and stacked according their length and diameter class, ready for dispatch.

Creosote is purchased from Arcelor Mittal and FFS Refiners in tanker form. The product adheres to SANS 616 type 2 and 3 specification respectively.

Further reading


Creosote Treatment Process

Creosote Treatment Process

CCA Treated Poles

CA is a preservative containing copper, chromium and arsenic. CCA treatment prolongs the life of wooden poles eg: utility poles.

The CCA treatment process was pioneered in 1933 and is used worldwide. Chromium (chrome) ‘locks’ the copper and arsenic into the timber and reduces the risk of the chemicals leaching out. Copper and arsenic protect the wood from insect and fungal attack.

In the pressure treatment process, a solution of CCA is applied using a vacuum and pressure cycle, and the treated wood is then stacked to dry.

The primary advantages in the use of CCA-treated wooden poles are that it produces no smell or vapor and its surface can be easily painted.

Drawbacks of the wood are a strong green color at high retention values. It should not be used in applications where it is in contact with food or drinking water.

More reading on CCA treatment is available:

Chromated Copper Arsenic
Wood Preservation