Nitoproof 510 - Water-Based Epoxy Moisture Barrier Coating

Product Overview

Nitoproof 510 is a two-component, water-based epoxy primer coating system manufactured by Fosroc. It functions as a heavy-duty moisture barrier coating specifically engineered to seal and prepare highly absorbent, pitted concrete and masonry surfaces, as well as surfaces with blow holes. The product is supplied in two 10-litre components (Part A: FC000625-10L and Part B: FC000626-10L).

Product Composition and Appearance

Nitoproof 510 features a distinctive grey finish with a matt to semi-gloss appearance. The two-component system comprises:

• Part A (Base): White liquid (FC000625-10L) - 10 litres
• Part B (Hardener): Grey liquid (FC000626-10L) - 10 litres

When mixed, the components create a grey, viscous liquid with approximately 49% volume solids and a VOC content of less than 5g/litre, making it an environmentally responsible choice for construction applications.

Key Technical Specifications

Mixing and Pot Life

The component mixing procedure requires individual mixing of both the Base and Hardener to a homogenous state before combining. Equal parts mixing (1:1 by volume or weight) should be performed with a slow speed power stirrer for 3 minutes, avoiding aeration of the material. The mixed composition has the following working characteristics:

• Pot Life: 1 hour at 35°C / 2 hours at 25°C
• Recoat Time: 3-4 hours at 25°C/50% RH
• Hard Cure: 24 hours at 25°C
• Complete Cure: 7 days at 25°C

Application Temperature Requirements

Temperature control is critical for optimal performance:

• Minimum Application Temperature: 5°C (with 10°C being the threshold for optimal application)
• Optimal Application Range: 15-25°C for best curing and application characteristics
• Surface Preparation: Substrate moisture content must not exceed 5% when tested using a Tramex CMEX5 moisture meter

Coverage Rates and Dry Film Thickness

Nitoproof 510 is applied at a coverage rate of 5 square meters per litre. The product serves two distinct application purposes with different coverage requirements:

As a Moisture Barrier

For moisture barrier applications requiring a minimum dry film thickness of 200 μm:

• Application Method: Two coats at 5 m²/litre each (undiluted)
• Total Coverage: 0.4 litre/m² (total 2 coats)
• Wet Film Thickness: Minimum 200 microns per coat

As a Primer for Waterproofing Membranes

For primer applications achieving minimum dry film thickness of 100 μm:

• Application Method: Single coat at 5 m²/litre (undiluted)
• Total Coverage: 0.2 litre/m² (single coat)
• Minimum Wet Film Thickness: 200 microns

The final dry film build achieved is dependent upon substrate porosity, with substrate porosity affecting both the coverage rate and final performance.

Curing and Drying Times

Drying and curing times are temperature-dependent:

• Above 20°C: Minimum 3 hours drying time between coats
• Below 20°C: Minimum 6 hours drying time between coats
• Foot Traffic Ready: Next day at room temperature
• Complete Cure: 7 days at 20°C under normal conditions

When relative humidity exceeds 85%, cure rates will be dramatically slowed. Water-based coatings should not be used under combined conditions of low temperature and high humidity.

Functional Properties and Performance

Moisture Barrier Capability

When applied at the minimum 200 microns dry film thickness, Nitoproof 510 provides:

• Water Pressure Resistance: Withstands positive head of water pressure up to 25 metres (up to 250 kPa of hydrostatic pressure)
• Water Vapour Permeance: 0.12g/24 hrs/m².mmHg @ 32°C/50% RH
• Solvent-Free Formulation: Suitable for environmentally sensitive applications

Adhesion and Compatibility

Nitoproof 510 demonstrates excellent adhesion properties with the following characteristics:

• Compatible bonding of most subsequently applied coatings, bonding agents, and water-based adhesives
• Excellent adhesion to a variety of substrates including concrete, brick, masonry, block, compressed fibre board, stone and timber
• Readily sanded if required for surface finish
• Compatible with damp substrates, allowing application to surfaces with existing moisture content

Primary Uses and Applications

Moisture Barrier Coating

Nitoproof 510 restricts the passage of dampness through concrete and masonry substrates in applications including:

• Interior faces of walls, floors, basements, tunnels, cellars
• Retaining walls, lift wells, underground car parks
• Low pressure moisture ingress resistance

Waterproofing Membrane Primer

Nitoproof 510 functions as a robust primer alternative for numerous Nitoproof waterproofing membranes, including:

• Nitoproof 310: Fibre-enhanced single component water-based latex waterproofing membrane for wet areas
• Nitoproof 910: Single-component polyurethane liquid waterproofing membrane
• Nitoproof 750: Elastomeric polyurethane waterproofing membrane
• Nitoproof 810: Highly flexible, water-based polyurethane waterproofing membrane
• Alternative to Nitoprime 120 on porous masonry surfaces

Surface Preparation Requirements

Sound, clean substrate preparation is essential for optimal performance:

• All surfaces must be clean, sound, and free of previous coatings, grease, oil, dirt, adhesives, laitance and contaminants
• A variety of preparation methods can be employed, ranging from high-pressure water blasting to mechanical scarification
• Holes and non-structural cracks should be repaired with appropriate repair mortar
• Very dry and highly porous surfaces should be sprayed with a fine mist of water prior to application
• Concrete and masonry substrates should have moisture content not exceeding 5% when tested using Tramex CMEX5 meter

Application Methods

Nitoproof 510 can be applied using multiple techniques:

• Squeegee Application: Spread material with suitable squeegee or stiff nylon broom, working product into surface to ensure total absorption into pin holes and voids
• Roller Application: Finished using a medium to long nap roller after squeegee application
• Spray Application: Acceptable with addition of 10% water to assist spraying and penetration
• Brush Application: Suitable for smaller areas and detailed work

Storage and Shelf Life

Shelf Life: 24 months from date of manufacture when kept in a dry store in original, unopened packaging

• Storage Conditions: Protect from frost
• Temperature Range: Optimal storage between 5°C and 30°C
• Container: Original, unopened containers essential for maintaining shelf life

Key Advantages

The product offers multiple benefits for construction and waterproofing applications:

• Solvent-Free formulation with very low VOC emission
• Anti-Microbial Formulation providing additional protection
• Very Low Odour and water-based with no volatile emissions
• Easy Clean-Up using water
• Improved Coverage Rates at 5m² per litre
• Compatible with Damp Substrates, allowing flexible application schedules

Important Compatibility Note

Critical Compatibility Issue: The new formulation of Nitoproof 510 is NOT compatible with the previous formulation (Nitoproof 510 Part A FC000610-10L & Part B FC000611-10L). Only the new components (FC000625-10L and FC000626-10L) should be mixed together.

References

• [1] Fosroc_Nitoproof_510_TDS.pdf
• [3] Fosroc_Nitoproof_410_TDS.pdf
• [4] Fosroc_Nitoproof_310_TDS.pdf
• [7] Fosroc_Nitoproof_910_TDS.pdf