PPG NovaGuard 840, is a two-component, solvent-free, amine-cured novolac phenolic epoxy coating for heavy H2S wastewater environments suitable for unleaded fuel storage in sectors, such as aviation. Novaguard 840 has good chemical and solvent resistance, and is particularly resistant to crude oil (up to 120°C (250°F). The coating applies to primed steel or directly to concrete and masonry with a glossy and smooth appearance, and can be applied by heavy-duty, single-feed, airless spray equipment (60:1).

NovaGuard 840 meets the requirements of EI 1541 2.2 (coating systems for aviation fuel storage tanks and pipes) & NSF/ANSI Standard 61 for potable water when applied and used as described. Contact our technical team for more information on 0113 2455450, and refer to the tables below for information such as curing times and spread.

Top Features & Benefits

• 2-part system (Mixing ratio by volume: base to hardener 80:20 (4:1))
• Solvent-free, amine-cured novolac phenolic epoxy coating
• Good visibility due to light color
• Reduced explosion risk and fire hazard
• Suitable for storage of unleaded gasolines
• Good chemical resistance against a wide range of chemicals and solvents
• Excellent resistance to crude oil up to 120°C (250°F)
• Can be applied by heavy-duty, single-feed, airless spray equipment (60:1)
• Meets the requirements of EI 1541 2.2 (coating systems for aviation fuel storage tanks and pipes)
• Meets NSF/ANSI Standard 61 for potable water when applied and used as described.
• Overcoating interval of 24 hours
• 1 hour pot life (at 20°C (68°F))
• Refer to tables below for information regarding spreading rate and film thickness, overcoating intervals and curing times

Product Data

Basic data at 20°C (68°F)

Notes:

• Refer to tables below for information regarding spreading rate and film thickness, overcoating intervals and curing times

Preparation & Application

Recommended Substrate Conditions & Temperatures

Carbon steel

• Steel; blast cleaned to a minimum of SSPC-SP10 or ISO-SA2½ , blasting profile 50 – 125 µm (5.0 mils) (2.0 – 5.0 mils)
• Steel with suitable primer (NOVAGUARD 260 or PHENGUARD 930) must be dry and free from any contamination

Concrete

• Remove grease, oil and other penetrating contaminants according to ASTM D4258
• Abrade the surface per ASTM D4259 to remove all chalk and surface glaze or laitance. Achieve surface profile - ICRI CSP 3 to 5
• NOVAGUARD 840 with PPG 884 Additive or AMERCOAT 114A may be used as a pit filler for certain applications. Check with PPG Technical Service for guidance on chemical resistance
• Maximum recommended moisture transmission rate is 3 lbs / 1,000 ft2 / 24 hours by moisture transmission test (ASTM F1869, calcium chloride test or by ASTM D4263, plastic sheet test)
• Moisture content should not exceed 4% (ASTM D4944, Calcuim Carbide Gas method)

Substrate temperature and application conditions

• Substrate temperature during application and curing should be above 5°C (41°F)
• Substrate temperature during application and curing should be at least 3°C (5°F) above dew point

Instructions For Use

Mixing ratio by volume: base to hardener 80:20 (4:1)

• The temperature of the mixed base and hardener should preferably be at least 20°C (68°F)
• At lower temperature, the viscosity will be too high for spray application
• No thinner should be added
• Mix thoroughly before application

Application

Airless spray

• Use heavy-duty, single-feed, airless spray equipment, preferably 60:1 pump ratio and suitable high-pressure hoses/inline heating or insulated hoses may be necessary to avoid cooling down of paint in hoses at low air temperature
• Length of hoses should be as short as possible
• No thinner should be added

Nozzle orifice

• Approx. 0.53 mm (0.021 in)

Nozzle pressure

• At 20°C (68°F) paint temperature min. 28.0 MPa (approx. 280 bar; 4061 p.s.i.)
• At 30°C (86°F) min. 22.0 MPa (approx. 220 bar; 3191 p.s.i.)

Brush

• Brush: for stripe coating and spot repair only
• No thinner should be added

Cleaning solvent

• Thinner 90-53 or Thinner 90-83

Notes:

• Paint inside the spraying equipment must be removed before the pot life has been expired
• All application equipment must be cleaned immediately after use

Additional Data

Note: Maximum DFT when brushing: 150 µm (6.0 mils)

Measuring Wet Film Thickness

• A difference is often obtained between the measured apparent WFT and the real applied WFT. This is due to the thixotropy and the surface tension of the paint, which retards the release of air, trapped in the paint film for some time
• Recommendation is to apply a WFT, which is equal to the specified DFT plus 60 µm (2.4 mils)

Measuring Dry Film Thickness

• Because of low initial hardness the DFT cannot be measured within some days, due to the penetration of the measuring device into the soft paint film
• The DFT should be measured using a calibration foil of known thickness placed in between the coating and the measuring device

Notes:

• Surface should be dry and free from any contamination

Notes:

• Gasoline or gasoline/alcohol blends are not included in purely aliphatic petroleum products, please contact our technical team on 0113 2455450 for further details
• Adequate ventilation must be maintained during application and curing (please refer to INFORMATION SHEETS 1433 and 1434)

Note: Due to exothermic reaction, temperature during and after mixing may increase

Product Qualifications

Qualified for ANSI/NSF Standard 61 (potable water) - NSF Application Instructions