Derakane Chemical Resistance Guide - Structured Summary

1. Introduction and Scope

This guide details the chemical resistance properties of Derakane and Derakane Momentum epoxy vinyl ester resins by Ashland, designed for corrosion-resistant fiber-reinforced plastic (FRP) applications in harsh industrial environments. It covers typical corrosion barrier designs and emphasizes the importance of proper design, manufacture, and installation to meet performance expectations. Users are advised to consult relevant industrial standards.

2. Product Descriptions

• 411 Series: Bisphenol-A based, globally standard, resistant to acids, bases, bleaches, solvents; excellent toughness and fatigue resistance.
• 441-400 Series: Low styrene monomer bisphenol-A resins; intermediate mechanical, thermal, and chemical resistance; suited for thermal cycling.
• 470 Series: Phenolic epoxy vinyl ester resins; superior heat and chemical resistance, especially to solvents, acids, oxidizers; preferred for flue gas applications.
• 510A/C Series: Brominated resins with enhanced flame retardance and resistance to chlorine and bleach; improved toughness.
• 510N Series: Brominated phenolic resins; highest flame retardance and stability in chlorine, bleach, warm flue gas environments.
• 8084: Elastomer-modified bisphenol-A resin; high toughness, impact and fatigue resistance; excellent adhesion; used in structural and chemical-resistant linings.

3. Chemical Resistance Tables and Usage

Comprehensive tables provide maximum recommended service temperatures (°C/°F) for each resin series against various chemicals and concentrations. Key points include:

• Temperatures reflect industrially satisfactory use or ASTM C581 test conditions.
• Blank entries indicate insufficient data; "NR" means Not Recommended; "LS" means Limited Service (short-term exposure, typically ≤1 year at ≤40°C).
• Temperature limits apply across all product grades within each resin series.
• Users should consult the latest data online for updates.

4. Notes and Recommendations

• Use two layers of synthetic surface veil and a 5 mm corrosion-resistant barrier layer for acidic environments.
• Post-curing is recommended to extend service life, especially below 100°C and for solvent exposure.
• Peroxide/amine curing systems should be post-cured within two weeks, following DIN 18820 guidelines (80°C for 411, 510A/C, 8084; 100°C for 470, 510N; 1 hour per mm thickness).
• Acid-resistant glass fibers are advised for barrier and structural layers in acidic environments above 50°C.
• Consult Ashland technical services for specialized advice.

5. Special Conditions and Limitations

• Testing under actual or simulated conditions is necessary for environments beyond the guide’s scope.
• Coatings and linings have specific thermal expansion and durability characteristics; hand lay-up and post-curing are preferred application methods.
• High flue gas temperatures may require carbon veils if synthetic veils are insufficient.
• Short-term or intermittent exposure above recommended temperatures may still be acceptable.
• Caution is advised for mixed or alternating chemical environments due to possible synergistic corrosion effects.

6. Chemical Resistance Data Highlights

The guide provides extensive data on maximum service temperatures for various chemicals and concentrations, including:

• Hydrochloric acid (0-33%): 441 series tolerates up to 65°C; others often not recommended.
• Ammonia vapors (40 vol%): all resins up to 80°C.
• Sulfamic acid (0.5-10%): all resins up to 100°C.
• Acetone (10%): all resins up to 80°C; 100% acetone generally not recommended.
• Benzene and related aromatics: generally not recommended or limited service at low temperatures.
• Propylene glycol and derivatives: resistant up to 100°C.

7. Chemical Resistance Inquiry and Safety

The guide includes a chemical resistance inquiry form to assist users in providing detailed chemical composition, concentrations, temperatures, equipment type, and operating conditions for Ashland technical support. Safety precautions emphasize handling and transport per Safety Data Sheets (SDS) and trained personnel requirements.

8. Legal and Usage Disclaimer

Ashland provides recommendations based on experience and resin performance knowledge but disclaims legal responsibility for resin use or application methods. Permission is required for reproduction of guide content.

9. Summary Table Insights and Best Practices

• Resin grades differ in maximum temperature tolerance and chemical resistance; selection must consider chemical type, concentration, and operating temperature.
• NR (Not Recommended) and LS (Limited Service) entries indicate restricted or unsuitable conditions.
• Post-curing and proper barrier layer design improve durability.
• Consult the guide and technical support for complex or borderline cases.
• Use acid-resistant fibers and appropriate veil materials for harsh environments.

10. Company and Contact Information

• Ashland operates globally with regional headquarters in Europe (Spain), North America (USA), Asia-Pacific (China), and India, providing technical support and sales.
• Commitment to quality (ISO 9001), safety, and environmental stewardship (Responsible Care) is emphasized.

Overall Summary

This comprehensive guide is an essential resource for engineers and chemists selecting Derakane epoxy vinyl ester resins for corrosion-resistant FRP applications. It provides critical chemical resistance data, design and curing recommendations, safety information, and limitations to optimize resin performance and longevity in diverse industrial chemical environments.