When specifying or procuring timber poles for utility, industrial, agricultural, or construction applications, the
choice of preservative treatment has a profound impact on performance, longevity, and lifecycle cost.
Two of the most common treatments for hardwood and softwood poles — including those manufactured from
eucalyptus species — are creosote treatment and CCA (Chromated Copper Arsenate) treatment.

At Khulani Timber Industries, we manufacture poles to exacting SANS specifications using either creosote or CCA treatment methods, giving clients the flexibility to choose the optimal solution for their specific requirements.

This article explores why many clients continue to choose creosote treated poles over CCA in certain applications, what advantages creosote delivers, and how Khulani supports both treatment options.

Understanding the difference: Creosote Treatment

Creosote is an oil-based preservative derived from coal tar, widely used for heavy-duty timber applications. The wood is pressure-impregnated with creosote, which penetrates the fibres and creates a protective barrier against decay, moisture ingress, and wood-destroying organisms. 

Creosote-treated poles typically exhibit high resistance to water penetration, strong deterrence of fungal decay, resistance to termites and borers and is also durable in harsher outdoor environments. 

CHROMATED COPPER ARSENATE (CCA) 

CCA treatment involves pressure-impregnating wood with a waterborne solution containing copper, chromium, and arsenic compounds. This mix protects against decay, insects, and wood-destroying fungi. 

CCA-treated timber tends to be lighter in colour (often greenish) and is more commonly specified for applications where visual aesthetics and lower environmental profile are priorities. 

Khulani offers both creosote and CCA (marketed locally as Tanalith) treated poles, allowing clients to match performance and regulatory requirements. 

THE ADVANTAGES OF CREOSOTE: 

1. Superior Moisture Repellence and Dimensional Stability 

Creosote is oil-based, which means that it doesn’t absorb moisture as readily as waterborne treatments. This makes creosote-treated poles particularly suited to environments where frequent wet/dry cycles occur — such as coastal zones, areas with heavy rainfall, or agricultural irrigation zones. This moisture resistance helps the pole maintain its structural integrity over long timeframes. 

2. Extreme Outdoor Longevity 

For infrastructure that must perform reliably over decades, such as transmission line poles, telephone poles, and marine posts, creosote delivers long-lasting protection against both biological and environmental degradation. With correct specification and installation, creosote poles can achieve service lives measured in multiple decades, minimising maintenance and replacement costs. 

3.Proven Performance for Heavy-Duty Applications 

Creosote’s long history in industrial timber preservation, including railway and utility use, stems from its robust performance, particularly against fungal decay and insects that thrive in humid soils. Its dense, deep-penetration profile forms a defensive, durable coating around the wood fibres. 

For clients specifying poles in high-stress environments — such as utility infrastructure, coastal installations, or high humidity regions — this higher threshold of performance can be crucial. 

4. Minimal Material Alteration 

Creosote impregnation tends not to significantly alter the mechanical properties of the wood. Poles retain their natural strength and load-bearing characteristics, which is essential for utility and structural applications. 

CCA, WHEN IT’S THE RIGHT CHOICE: 

While this article highlights creosote advantages, it’s important to note that CCA has its place: 

• It’s better suited for applications with close human contact (e.g., fencing posts in residential areas) due to its lower odour profile. 
• It has a lighter colour and ease of painting or finishing for aesthetic purposes. 
• It can be a strong preservative where environmental regulations or project guidelines limit creosote use. 

Khulani’s range includes poles treated with both creosote and CCA/Tanalith, giving clients flexibility across Utility, Construction, Ranch, and Specialty markets. 

HOW KHULANI SUPPORTS YOUR NEEDS: 

At Khulani Timber Industries, all poles are manufactured to SANS quality standards and treated with either creosote or CCA (Tanalith) depending on client specifications. 

Product Range Includes: 

• Transmission, Telephone & Fibre poles – Sizes from 2.5m to 20m in creosote or CCA,
• Building and fencing poles- Available treated for long-lasting performance,
• Ranch fencing poles and guardrail posts – Treated options for long-term outdoor use,
• Laths, droppers, and shade netting poles – Treated for resistance to decay.

Khulani’s treatment facilities and quality processes ensure deep preservative penetration and durable timber products that meet or exceed industry performance expectations. 

Choosing between creosote and CCA treated poles depends on the project’s performance requirements, environmental conditions, aesthetic expectations, and regulatory considerations. For many heavy-duty, long-term outdoor applications, especially where moisture, biological attack, and durability are critical, creosote treatment remains the industry standard. 

With Khulani’s comprehensive product range and dual treatment capability, clients can select the optimal timber solution for their needs, backed by proven performance and quality manufacturing.