Nitoproof 510: Water-Based Epoxy Moisture Barrier Coating

Product Overview

Nitoproof 510 is a grey, two-component, water-based epoxy primer coating system manufactured by Fosroc. It is specifically engineered as a heavy-duty moisture barrier and preparatory coating for highly absorbent and pitted concrete and masonry substrates.

Composition and Components

Nitoproof 510 is supplied as a two-part system in 20-litre packs:

• Part A (FC000625-10L): 10-litre white liquid component (Base)
• Part B (FC000626-10L): 10-litre grey liquid component (Hardener)

The components must be mixed in equal parts by volume or weight before application.

Key Features and Advantages

Nitoproof 510 offers several distinctive characteristics:

• Solvent-Free Formulation: Contains no organic solvents, making it environmentally friendly
• Very Low VOC Emission: VOC content of less than 5g/litre
• Water-Based: Easy cleanup using water; no odour or volatile emissions
• Anti-microbial Formulation: Provides built-in protection against microbial growth
• Compatible with Damp Substrates: Can be applied to surfaces with some moisture content
• Excellent Adhesion: Bonds tenaciously to concrete, brick, masonry, block, compressed fibre board, stone, and timber
• Readily Sanded: Surfaces can be sanded if required for subsequent applications

Physical and Chemical Properties

Property	Specification
Colour	Base: white / Hardener: grey
Mixed Appearance	Grey viscous liquid
Volume Solids	Approximately 49%
VOC Content	<5g/litre
Mixing Ratio	Equal parts by weight or volume
Pot Life	1 hour @ 35°C / 2 hours @ 25°C
Surface Appearance	Matt/Satin finish
Recoat Time	3-4 hours @ 25°C/50% RH
Hard Cure	24 hours @ 25°C
Complete Cure	7 days @ 25°C
Minimum Curing Temperature	5°C
Water Vapour Permeance	0.12g/24hrs/m².mmHg @ 32°C/50% RH

Coverage Rates and Application Specifications

As a Moisture Barrier (Two-Coat Application)

• Coverage Rate: 5 square metres per litre per coat (undiluted)
• Minimum Dry Film Thickness (DFT): 200 micrometres
• Total Coverage: 0.4 litre/m² (two coats)
• Application Method: Squeegee and roller finish

As a Primer for Nitoproof Waterproofing Membranes (Single Coat)

• Coverage Rate: 5 m²/litre (undiluted)
• Minimum Dry Film Thickness (DFT): 100 micrometres
• Total Coverage: 0.2 litre/m² (single coat)

Note: Coverage rates are dependent upon substrate porosity; final dry film build achieved may vary.

Applications

Nitoproof 510 serves multiple functions within waterproofing systems:

• Moisture Barrier Coating: Restricts passage of dampness through concrete and masonry substrates in interior faces of walls, floors, basements, tunnels, cellars, retaining walls, lift wells, and underground car parks
• Heavy-Duty Primer: Robust alternative to Nitoprime 120 for sealing and preparing highly absorbent, pitted concrete and masonry surfaces and surfaces with blow holes
• Pre-treatment for Waterproofing Membranes: Applied as a primer before Nitoproof waterproofing membranes including Nitoproof 310, Nitoproof 410, Nitoproof 810, and Nitoproof 910
• Bitumen Isolation: Isolates bituminous surfaces in waterproofing applications
• Moisture Barrier for Porous Substrates: Prepares substrates for superior adhesion and performance of overlying waterproofing systems

Application Instructions

Surface Preparation

Essential surface preparation must be completed before application:

• All surfaces must be sound, clean, and free of previous coatings, grease, oil, dirt, adhesives, laitance, and other surface contamination
• Moisture content must not exceed 5% when tested using a Tramex CMEX5 moisture meter for primer applications
• 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 of the first coat

Mixing Procedure

The component mixing procedure is critical for proper performance:

1. Individually mix each component (Base and Hardener) to a homogeneous state
2. Change the mixing paddle before mixing the second component
3. Combine equal parts (1:1 by volume) of Base and Hardener
4. Mix for 3 minutes using a slow-speed power stirrer until uniform, avoiding aeration
5. Allow the mixed product to stand for five minutes before application

Application Method

• Spread the material using a suitable squeegee or stiff nylon broom, working Nitoproof 510 into the surface to ensure total absorption into pin holes and voids
• Finish using a medium to long nap roller
• Spray application is also acceptable; if spray applying the first coat, add 10% water to assist spraying and penetration
• Minimum wet film thickness: 200 micrometres per coat (checked using a Wet Film Thickness gauge)

Recoating

• Subsequent coats can be applied after 3 to 4 hours cure at 25°C/50% RH
• Minimum interval between coats: 3 hours (temperature dependent)
• Maximum application interval: Subsequent products must be applied within 3 days of the last coat application

Curing and Temperature Characteristics

Optimal Temperature Range

Nitoproof 510 exhibits optimum curing and application characteristics between 15-25°C. Outside this range, performance is affected:

• Below 15°C: Rate of cure slows considerably
• Above 25°C: Working life of mixed composition is reduced

Curing Timeline

• Foot Traffic Ready: Next day at room temperature
• Hard Cure: 24 hours @ 25°C
• Complete Cure: 7 days @ 25°C

Environmental Limitations

• Minimum Application Temperature: 5°C; components should be stored in temperature-controlled environment for 12 hours before use below 10°C
• Maximum Ambient Temperature: Above 30°C, material should be stored in shade or air-conditioned environment for 12 hours before use
• Humidity Limitation: Cure rates are dramatically slowed if relative humidity exceeds 85%
• General Recommendation: Water-based coatings should not be used under combined conditions of low temperature and high humidity

Storage and Shelf Life

• Shelf Life: 24 months from date of manufacture
• Storage Conditions: Keep in dry store in original, unopened packaging
• Temperature Range: 5-30°C
• Protection: Must be protected from frost

Compatibility Information

Important: The current Nitoproof 510 formulation is NOT compatible with previous formulations:

• Previous Part A (FC000610-10L) - NOT compatible
• Previous Part B (FC000611-10L) - NOT compatible

Components from different formulations must never be mixed.

Performance Characteristics

When applied at 200 micrometres dry film thickness, Nitoproof 510 provides:

• Hydrostatic Pressure Resistance: Withstands positive head of water pressure up to 25 metres / up to 250 kPa
• Tenacious Bonding: Creates strongly bonded coating controlling transmission of liquid moisture
• Film Build: Provides uniform theoretical dry film thickness dependent on substrate porosity
• Moisture Control: Effectively restricts passage of dampness while allowing water vapour escape in certain applications

Safety and Documentation

• A Safety Data Sheet (SDS) is available from the Fosroc website and must be read prior to use
• A Technical Data Sheet (TDS) provides comprehensive product knowledge and application instructions
• In emergencies, contact any Poisons Information Centre (phone 13 11 26 within Australia) or a doctor for advice

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References

• [1] Fosroc_Nitoproof_410_TDS.pdf
• [2] Fosroc_Nitoproof_510_TDS.pdf
• [3] Fosroc_Nitoproof_310_TDS.pdf
• [5] Fosroc_Nitoprime_120_TDS.pdf