Thermaguard™ CUI 300

Thermaguard™ CUI 300 – Ambient-Cure CUI Coating for Temperatures Up to 300°C

Thermaguard™ CUI 300 is a high-build, single-component, ambient-curing polysiloxane coating formulated for Corrosion Under Insulation (CUI) protection in temperatures from -196°C to +300°C.

This third-generation polysiloxane eliminates the need for heat curing, offering fast hardness development and recoat times of just 2 hours at 20°C—making it ideal for both shop applications and on-site maintenance.

Key Features & Benefits

• ✅ Wide Temp Range: Effective from -196°C to +300°C

• ✅ No Heat Curing Needed: Fully ambient cure technology

• ✅ Fast Recoat: Only 2 hours at 20°C for quicker job turnaround

• ✅ Hot Application Ready: Apply directly to surfaces up to 300°C

• ✅ NACE SP0198-2017 Compliant: CUI coating certified

• ✅ High Build System: Exceptional durability and protection

• ✅ Anti-Corrosion Primer: Ideal under TIC 400 insulation coatings

Built to Perform in Harsh Environments

Thermaguard™ CUI 300 is engineered to withstand the most aggressive CUI conditions and is fully tested to:

• Rapid thermal cycling

• Boiling saline water immersion

• Chemical exposure

• C5 high-corrosion environments

• Weathering and hardness resistance (ISO & ASTM certified)

Recommended Applications

• Protection for carbon and stainless steel in CUI zones

• Suitable for cryogenic and high-temp pipelines, tanks, vessels

• Use in LNG plants, petrochemical sites, power stations, and offshore environments

• Compatible with marginally prepared steels (St 2/3)

• Excellent as a base layer beneath Thermaguard™ TIC 400 thermal insulation coatings

Technical Specifications

• Product Type: Third-gen polysiloxane

• Cure: Full ambient, no heat needed

• Temperature Range: -196°C to +300°C

• Hot Surface Application: Up to 300°C

• Recoating Time: 2 hours at 20°C

• Surface Prep: St 2/3 acceptable

• Usage: Primer for insulation coatings, maintenance, and new-build

For full system recommendations or to discuss specification support, call our technical team on 01268 472358.