Formulated for aggressive chemical environments. Our thermosetting epoxy resins and high-density polyurethane films provide external galvanic protection for structural steel profiles exposed to corrosive industrial atmospheres.
Zinc dust loading >85% by weight in dry film
Salt spray resistance exceeds 3,000 hours
Compatible with your existing application equipment?
Our zinc-rich epoxy and high-density polyurethane formulations are engineered for structural steel exposed to aggressive chemical environments, not for general-purpose maintenance painting.
Standard epoxy primers rely on barrier protection alone. Our zinc-rich thermosetting epoxy delivers sacrificial cathodic protection — even when the coating is chipped or scratched, the zinc dust continues to protect the steel substrate. This is critical for structural profiles in chemical plants where mechanical damage is common.
Typical polyurethane topcoats allow gradual ingress of aggressive agents through micro-porosity. Our high-density formulation achieves a crosslink density that measurably reduces permeation of chlorides, acids, and industrial solvents. Third-party testing shows 40% lower chemical absorption compared to standard polyurethane films.
Many two-coat systems require an intermediate wash primer to achieve intercoat adhesion. Our epoxy-polyurethane hybrid system eliminates that step — the epoxy primer and polyurethane topcoat are chemically matched to bond directly, reducing application time and eliminating a common failure point in the coating system.
Clients in chlor-alkali plants, fertilizer terminals, and offshore loading facilities report that our system extends recoating intervals to 7–10 years. In one case, a structural steel gantry exposed to hydrochloric acid vapor showed no substrate corrosion after 5 years of continuous exposure — a performance benchmark that generic coatings could not meet.
Every batch of our zinc-rich epoxy and polyurethane topcoat is tested for zinc dust content, viscosity, solids by weight, and cure profile. We provide a certificate of analysis with each shipment, so specifiers and applicators have documented proof that the coating meets the project specification — not just a label claim.
Key Benefits
Zinc-rich epoxy primer provides cathodic protection to steel even where the film is scratched or damaged. The high zinc loading ensures continuous electron flow, preventing underfilm corrosion in aggressive chemical atmospheres.
Zinc dust content exceeds 85% by weight in dry film.Thermosetting epoxy matrix resists attack from acids, alkalis, and solvents up to 120°C continuous exposure. Crosslink density is optimized to minimize swelling and delamination in splash zones and immersion service.
Tested per ASTM D1308 for 30 days immersion in 10% H₂SO₄.Polyurethane topcoat forms a dense, pinhole-free film with water vapor transmission rate below 0.5 g/m²/day. This barrier prevents electrolyte ingress that would otherwise activate galvanic corrosion cells.
Measured at 40°C and 90% RH per ASTM E96.Aliphatic polyurethane chemistry resists yellowing and chalking under direct sunlight for over 10 years in moderate climates. The film retains impact resistance and flexibility even after prolonged UV exposure.
QUV-A accelerated weathering per ASTM G154: 3000 hours.Formulated for surface preparation Sa 2½ (near-white metal) with a 50–75 µm anchor profile. Pull-off adhesion values consistently exceed 15 MPa, ensuring the coating system remains intact under thermal cycling and mechanical stress.
Adhesion tested per ISO 4624 on 3 mm steel plate.Field data from chemical processing plants shows a 40% extension in recoating intervals compared to conventional epoxy-polyurethane systems. The combination of galvanic protection and barrier properties minimizes spot repairs and downtime.
Based on 5-year inspection records at three industrial sites.Straightforward answers about our zinc-rich epoxy primers and polyurethane topcoats for structural steel in aggressive chemical environments.
A zinc-rich epoxy primer contains a high concentration of zinc dust — typically above 80% by weight in the dry film. This provides sacrificial galvanic protection: if the coating is scratched or damaged, the zinc corrodes preferentially, protecting the underlying steel. Standard epoxy primers offer barrier protection only and cannot self-heal at damaged areas.
Yes. Our high-density polyurethane topcoat is formulated for direct application over the cured zinc-rich epoxy primer. The system is designed for optimal intercoat adhesion without requiring an intermediate tie coat. We recommend a maximum overcoat window of 72 hours at 25°C to ensure chemical bonding between layers.
Steel surfaces must be abrasive-blast cleaned to Sa 2½ (ISO 8501-1) with a minimum anchor profile of 75–100 microns. All dust, oil, and soluble salts must be removed. For galvanized surfaces, a light sweep blast or chemical etch is required. Surface temperature should be at least 3°C above the dew point to prevent moisture condensation during application.
Service life depends on exposure severity, film thickness, and maintenance. In typical chemical plant atmospheres with periodic chemical splashes and elevated temperatures, the system typically provides 8–12 years before major maintenance is needed. Regular inspections and touch-up of damaged areas can extend this significantly. We provide project-specific life-cycle estimates based on your exposure conditions.
The zinc-rich epoxy primer can withstand continuous dry heat up to 150°C. The polyurethane topcoat is rated for continuous service up to 120°C. For intermittent exposure or higher temperatures, we recommend our specialized high-heat variant. Always consult our technical data sheet for exact temperature limits based on your specific environment.
Yes. Our team provides on-site application support, including surface preparation verification, mixing and application guidance, and wet film thickness monitoring. We also offer third-party inspection coordination and can supply written application procedures tailored to your project. Contact us at info@myaustralianaonline.com or call 0044 4637725 to schedule support.