SIGMAGUARD 425 4 pages DESCRIPTION January 2008 Revision of September 2005 two component solvent free polyamine cured epoxy coating PRINCIPAL CHARACTERISTICS – provides long term protection for ballast tanks and steel structures, with excellent resistance against corrosion and seawater – suitable for block stage application – good edge covering capacity – reduces explosion risk and re hazard in conned spaces – can be applied by single feed airless spray equipment COLOURS AND GLOSS grey, green - gloss BASIC DATA AT 20°C (1 g/cm³ = 8.25 lb/US gal; 1 m²/l = 40.7 ft²/US gal) (data for mixed product) Mass density Volume solids VOC (supplied) 1.4 g/cm³ 98 ± 2% max. 47 g/kg (Directive 1999/13/EC, SED) max. 66 g/l (approx. 0.6 lb/gal) see information sheet 1411 250 µm 3.9 m²/l fo 250 µm * 12 hours * min. 24 hours * max. 7 days * Recommended dry lm thickness Theoretical spreading rate Touch dry after Overcoating interval (data for components) Shelf life (cool and dry place) at least 12 months * see additional data RECOMMENDED SUBSTRATE CONDITIONS AND TEMPERATURES – previous coat; dry and free from any contamination – substrate temperature should be above 5°C and at least 3°C above dew point – maximum relative humidity during application and curing is 80% – dust quantity rating "1" for dust size class "3", "4" or "5", lower dust size classes to be removed if visible on the surface to be coated without magnication (ISO 8502-3:1992) SYSTEM SPECIFICATION marine INSTRUCTIONS FOR USE mixing ratio by volume: base to hardener 80 : 20 system sheet: 3106 (spec. 7) – when mixing the temperature of the base and hardener should be at least 20°C – at lower temperature the viscosity will be too high for spray application – no thinner should be added page 1/4

SIGMAGUARD 425 January 2008 Induction time none Pot life approx. 1 hour at 20°C * * see additional data AIRLESS SPRAY Recommended thinner Nozzle orice Nozzle pressure – use heavy duty single feed airless spray equipment preferably 60:1 pump ratio and suitable high pressure hoses – in-line heating or insulated hoses may be necessary to avoid cooling down of paint in hoses at low air temperature – the paint lines should be as short as possible no thinner should be added approx. 0.53 mm (= 0.021 in) at 20°C (paint temperature) min. 28 MPa (= approx. 280 bar; 4000 p.s.i.) at 30°C (paint temperature)...

SIGMAGUARD 425 January 2008 measuring dry lm thickness – because of low initial hardness the dft cannot be measured for some days (depending on ambient temperature) after application due to the penetration of the measuring device into the paint lm – the dft should be measured using a calibration foil of known thickness placed in between the coating and the measuring device Overcoating table for SigmaGuard 425 for dft up to 250 µm (for spot repair and stripe coating only) with itself substrate temperature 5°C 10°C 20°C 30°C 40°C minimum interval 3 days 48 hours 24 hours 16 hours 12 hours maximum...

SIGMAGUARD 425 January 2008 REFERENCES Explanation to product data sheets see information sheet 1411 Safety indications see information sheet 1430 Safety in conned spaces and health safety Explosion hazard - toxic hazard see information sheet 1431 Safe working in conned spaces see information sheet 1433 Directives for ventilation practice see information sheet 1434 Cleaning of steel and removal of rust see information sheet 1490 PPG Protective & Marine Coatings Ballast Tank Working Procedure New Building LIMITATION OF LIABILITY The information in this data sheet is based upon laboratory tests...