Introduction: The High Stakes of Secondary Containment in Australia

Across Australia’s industrial landscapes—from chemical processing plants in Queensland to mining operations in Western Australia and wastewater facilities in Victoria—storing and processing hazardous materials carries immense responsibility. Concrete bunds, containment sumps, and processing floors act as the crucial last line of defense between aggressive industrial chemicals and the local ecosystem. When primary tanks fail, secondary containment structures must hold back thousands of liters of corrosive acids, alkalis, and hydrocarbons to prevent catastrophic groundwater and soil contamination.However, bare concrete is inherently porous. Untreated or incorrectly lined concrete exposed to harsh chemical immersion suffers rapid degradation. Micro-fractures, joint breakdown, and chemical attack allow dangerous substances to leach into subsoils and nearby waterways, triggering severe environmental disasters, operational downtime, and punitive fines from state environmental protection authorities (such as the NSW EPA, Victoria EPA, or QLD DES).To solve this challenge, asset owners, engineers, and protective coating applicators rely on high-performance materials engineered specifically for severe chemical immersion: Liquimix Novolox-XT900.This comprehensive guide breaks down how Novolox-XT900 functions as an impermeable shield, its technical advantages over standard epoxies, and best practices for Australian applicators installing secondary containment systems.

Understanding Secondary Containment and Australian Compliance Standards

The Role of Chemical Bunding

A chemical bund is an engineered retention basin designed to capture liquids spilling or leaking from primary storage vessels, pipes, or processing equipment.

In Australian industrial environments, bunding is governed by strict regulations, including AS 1940:2017 (The storage and handling of flammable and combustible liquids) and localized EPA guidelines. These standards dictate not only the capacity of the bund (typically requiring 110% of the largest tank’s volume) but also the impermeability of the lining system.

The Vulnerability of Unprotected Concrete

Concrete is a structurally strong building material, but chemically, it is highly reactive and porous:

Acidic Attack: Concrete relies on an alkaline matrix (calcium hydroxide). Acids immediately react with this matrix, disintegrating the concrete surface and exposing reinforcing steel (rebar) to corrosion.

Solvent Penetration: Low-viscosity solvents quickly permeate porous concrete, bypassing secondary containment barriers and entering the surrounding soil.

Thermal and Structural Cracking: Daily temperature swings in harsh Australian climates cause structural expansion and contraction, creating pathways for fluid migration.

A simple decorative epoxy or standard floor paint cannot withstand long-term chemical immersion or aggressive chemical exposure. Achieving true environmental protection requires a 100% solids novolac epoxy lining system.

What is Novolox-XT900?

Liquimix Novolox-XT900 is an Australian-manufactured, two-component, 100% volume solids novolac epoxy coating formulated for extreme chemical, water, and anti-corrosion protection on concrete and steel substrates.

Why Novolac Chemistry Outperforms Standard Epoxies

Standard bisphenol-A or bisphenol-F epoxy coatings contain fewer reactive sites per molecule. Under exposure to strong organic acids or aggressive solvents, these chains break down, causing the coating to soften, blister, or peel.Novolox-XT900 utilizes Novolac Epoxy Resin Technology, which features a tightly packed, highly cross-linked polymer network. This dense chemical structure delivers:

• Superior Chemical Resistance: Higher resistance to concentrated acids (such as sulfuric and hydrochloric acid), alkalis, and solvents.
• Low Permeability: Blocks liquid molecules from penetrating the film layer, keeping concrete dry and protected.
• Elevated Thermal Resistance: Maintains structural integrity under elevated temperature exposures common in processing facilities.

Key Technical Performance Features for Australian Conditions

When selecting a protective barrier for secondary containment, contractors and engineers choose Novolox-XT900 due to key performance specifications designed for real-world Australian application environments:

How Novolox-XT900 Prevents Environmental Chemical Spills

Preventing environmental contamination goes beyond just painting a surface; it requires building a completely continuous, impervious barrier across all bund surfaces. Here is how Novolox-XT900 mitigates risk in high-risk processing facilities:

1. Stopping Acid and Base PenetrationIn processing environments where chemical transfers occur daily, minor drips and major pipe bursts deposit aggressive fluids directly onto bund floors. Novolox-XT900 maintains its barrier integrity under prolonged chemical exposure, containing spills long enough for recovery crews to safely neutralize and pump out the liquid.
2. Eliminating Micro-Cracks and Surface PorosityOnce cured, Novolox-XT900 forms a smooth, non-porous surface that seals deep into concrete pores. This prevents chemicals from pooling inside concrete air pockets where they silently corrode rebar over time.
3. Long-Term Groundwater ProtectionBy sealing secondary containment areas, storage facilities achieve full EPA compliance. This prevents toxic chemicals from entering stormwater drains, localized aquifers, or adjacent agricultural land, protecting local wildlife and municipal water networks.

Primary Application Environments across Industry Novolox-XT900 is engineered for heavy-industrial areas where chemical exposure is a primary operational hazard:

1. Chemical Storage & Secondary Containment Bunds: Surrounding bulk tanks, drum storage areas, and Intermediate Bulk Container (IBC) stations.
2. Wastewater & Sewage Treatment Plants: Protecting concrete digestion tanks, sludge contact channels, and chemical dosing rooms against hydrogen sulfide H2S biogenic corrosion.
3. Mining & Hydrometallurgy Facilities: Lining acid leach tanks, reagent storage bays, and processing plant floors exposed to aggressive slurry and washdowns.
4. Pulp, Paper & Manufacturing Plants: Safeguarding chemical processing pits, bleaching bays, and washdown zones.
5. Fuel & Hydrocarbon Transfer Stations: Providing localized chemical and fuel containment in transport refueling hubs.

Step-by-Step Applicator Guide: Surface Prep & Application

Proper surface preparation accounts for 80% of coating success in chemical secondary containment. Applicators must adhere to strict surface prep guidelines to ensure zero failure under chemical immersion.

Step 1: Substrate Inspection & Decontamination

• Inspect concrete for moisture content, oils, grease, or previous failed coatings.

• Decontaminate using industrial degreasers or steam cleaning to ensure the pore structure is completely free of contaminants.

Step 2: Mechanical Surface Preparation

• Concrete: Abrasive blast (blastrac) or diamond grind to achieve a minimum Concrete Surface Profile of CSP 3 to CSP 5 according to ICRI guidelines. Remove all laitance and loose friable material to open the concrete pore structure.

• Steel: Abrasive blast clean to Sa 2.5 (ISO 8501-1) with a sharp, angular profile (75+ microns) to ensure maximum mechanical keying.

Step 3: Crack Repair & Detailing

• Fill all static cracks, bug holes, and concrete voids using a compatible high-solids epoxy filler or novolac repair mortar (e.g., Liquimix Renderfill).

• Install a minimum 25mm x 25mm coving cove fillet at all wall-to-floor junctions to eliminate 90-degree internal corners, which are prone to stress cracking under liquid weight.

Step 4: Mixing Procedure

• Thoroughly pre-mix Part A (Resin) and Part B (Hardener) individually.

• Combine Part A and Part B accurately at a 3:1 ratio by volume.

• Mix with a low-speed industrial drill and paddle for 2–3 minutes until uniform in color and streak-free. Take care not to entrain excess air.

Step 5: Coating Application

• Apply Novolox-XT900 via high-pressure squeegee, notch trowel, airless spray, or medium-pile solvent-resistant roller.

• Apply to the specified dry film thickness (typically 300 to 500+ microns per coat depending on chemical exposure levels).

• Ensure seamless coverage up the vertical walls of the bund wall to create a continuous “bathtub” containment liner.

Step 6: Curing & Quality Control

• Allow the coating to cure undisturbed. While it reaches touch-dry state rapidly, full chemical cure requires 5–7 days at 25°C (longer at cooler temperatures down to 5°C).

• Conduct spark testing (high-voltage holiday detector) over the cured membrane to confirm there are no pinholes or micro-voids prior to commissioning the bund for chemical service.

Maintenance, Testing, and Long-Term Value

Deploying a high-grade Novolac epoxy coating like Novolox-XT900 provides clear long-term return on investment (ROI) for facility managers:

• Reduced Maintenance Costs: Eliminates the cycle of patching damaged concrete every 12 to 18 months.
• Audit-Ready EPA Compliance: Demonstrates proactive risk mitigation during environmental and safety audits.
• Asset Longevity: Extends the structural lifespan of expensive concrete containment assets by decades.
• Simple Washdown: The smooth, non-porous finish allows fast, complete neutralisation and cleanup of spilled chemicals.

Routine annual visual inspections, combined with immediate neutralisation and clean-up of major spills, will ensure the bund lining system performs reliably for years.

Conclusion: Partnering with Liquimix for Superior Asset Protection

Secondary containment infrastructure is too critical to risk on substandard coatings. A single leak through porous concrete can lead to severe environmental damage, remediation costs, and operational downtime.

By specifying Liquimix Novolox-XT900, Australian engineers, chemical processing facility managers, and protective coating applicators can build chemical containment systems that easily stand up to severe chemical threats.

Need Specification Support for Your Next Bund Lining Project?

Liquimix provides full technical support, local Australian manufacturing, custom color matching, and specification assistance for industrial projects nationwide.

• Contact the Liquimix Technical Office: Call 1300 123 085
• Explore Product Specifications & Downloads: Visit Liquimix.com