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PPG SigmaCover 256 | Metal Primer

PPG SigmaCover 256

PPG4788
PPG4788

PPG SigmaCover 256 is a two component, high-build, polyamide-cured recoatable zinc phosphate epoxy primer.

  • General-purpose epoxy primer or buildcoat in protective coating systems, for steel and concrete structures in atmospheric exposure.
  • Suitable for atmospheric industrial and marine applications.
  • Can be recoated with various two-component and conventional coatings, even after long weathering periods.
  • Excellent rust preventing properties in industrial or coastal atmospheres
  • Tough, with long-term flexibility
  • Cures even at temperatures down to -10°C (14°F
  • Good adhesion to steel, galvanized steel and aged epoxy coatings
  • Easy application, both by airless spray and brush
  • Can be used as epoxy primer/finish (for dry internal areas)
Colour
Size
Finish
£68.86(incl. VAT)
£57.38(ex. VAT)
Quantity
Please choose your colour
Available for Delivery (See Delivery Options Below)

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Description

PPG SigmaCover 256 is a two-component, high-build, polyamide-cured recoatable zinc phosphate epoxy primer.



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Features & Benefits


  • General-purpose epoxy primer or buildcoat in protective coating systems, for steel and concrete structures in atmospheric exposure.
  • Suitable for atmospheric industrial and marine applications.
  • Can be recoated with various two-component and conventional coatings, even after long weathering periods.
  • Excellent rust preventing properties in industrial or coastal atmospheres
  • Tough, with long-term flexibility
  • Cures even at temperatures down to -10°C (14°F
  • Good adhesion to steel, galvanized steel and aged epoxy coatings
  • Easy application, both by airless spray and brush
  • Can be used as epoxy primer/finish (for dry internal areas)
  • Click to jump down to Technical Data



Product Specification


Technical Data
PPG SigmaCover 256
Number of Components: Two
Mass Density: 1.4 kg/l (11.7 lb/US gal)
Volume Solids: 63 ± 2%
VOC (supplied): Directive 1999/13/EC, SED: max. 245.0 g/kg
UK PG 6/23(92) Appendix 3: max. 338.0 g/l (approx. 2.8 lb/US gal)
Recommended Dry Film Thickness: 75 - 150 μm (3.0 - 6.0 mils) depending on system
Theoretical Spreading Rate: 6.3 m²/l for 100 μm (253 ft²/US gal for 4.0 mils)
Shelf Life: Base: at least 24 months when stored cool and dry
Hardener: at least 24 months when stored cool and dry



Film Thickness Range


Spreading Rate & Film Thickness
DFT Theoretical Spreading Rate
75 μm (3.0 mils) 8.4 m²/l (337 ft²/US gal)
100 μm (4.0 mils) 6.3 m²/l (253 ft²/US gal)
150 μm (6.0 mils) 4.2 m²/l (168 ft²/US gal)



Drying Times


Curing time for DFT up to 100μm (4.0mils)
Substrate temperature Dry To Handle Fully Cured
-10°C (14°F) 24 hours - 48 hours 20 days
-5°C (23°F) 24 hours - 30 hours 14 days
0°C (32°F) 18 hours - 24 hours 10 days
5°C (41°F) 18 hours 8 days
10°C (50°F)) 12 hours 6 days
15°C (59°F) 8 hours 5 days
20°C (68°F) 6 hours 4 days
30°C (86°F) 4 hours 3 days
40°C (104°F) 3 hours 48 hours

Notes:

  • Adequate ventilation must be maintained during application and curing.



Pot Life (at application viscosity)
Mixed Product Temperature Pot Life
10°C (50°F) 16 hours
15°C (59°F) 10 hours
20°C (68°F) 8 hours
30°C (86°F) 5 hours
35°C (95°F) 4 hours



Overcoating interval for DFT up to 150μm (6.0mils)
Overcoating with: Interval: -5°C (23°F) 5°C (41°F) 10°C (50°F) 20°C 68°F) 30°C (86°F) 40°C (104°F)
SIGMADUR 520, SIGMADUR 550, various chlorinated rubbers, vinyls, acrylates and alkyd paints.
Minimum 3 days 24 hours 16 hours 8 hours 5 hours 3 hours
Maximum Unlimited Unlimited Unlimited Unlimited Unlimited Unlimited

Notes:

  • - Maximum interval is only unlimited when the surface is free from any contamination
  • - SIGMACOVER 256 should not be overcoated with coal tar epoxy coatings



Surface Preparation


Substrate Conditions

  • Steel; blast cleaned to ISO-Sa2½, blasting profile 40 – 70 μm (1.6 – 2.8 mils)
  • Shop primed steel; pretreated to SPSS-Pt3 / SSPC-SP3
  • Galvanized steel must be sweep blasted until an even flat appearance (only for internal dry exposure conditions)
  • Aged suitable coating must be dry and free from any contamination

Substrate Temperature

  • Substrate temperature during application and curing down to -10°C (14°F) is acceptable; provided the substrate is free from ice and dry
  • Substrate temperature during application should be at least 3°C (5°F) above dew point
  • Relative humidity during application and curing should not exceed 95%



Application Methods


Mixing Ratio By Volume: Base To Hardener 82:18

  • The temperature of the mixed base and hardener should preferably be above 15°C (59°F), otherwise extra thinner may be required to obtain application viscosity
  • Adding too much thinner results in reduced sag resistance and slower cure
  • Thinner should be added after mixing the components

Pot Life:

  • 8 hours at 20°C (68°F)

Air Spray:

  • Recommended Thinner: THINNER 91-92
  • Volume Of Thinner: 10 - 15%, depending on required thickness and application conditions
  • Nozzle Orifice: 1.5 – 3.0 mm (approx. 0.060 – 0.110 in)
  • Nozzle Pressure: 0.3 - 0.4 MPa (approx. 3 - 4 bar; 44 - 58 p.s.i.)

Airless Spray:

  • Recommended Thinner: THINNER 91-92
  • Volume Of Thinner: 5 - 10%, depending on required thickness and application conditions
  • Nozzle Orifice: Approx. 0.48 mm (0.019 in)
  • Nozzle Pressure: 15.0 MPa (approx. 150 bar; 2176 p.s.i.)

Brush/Roller:



Product Notes


Information On Basic Physical And Chemical Properties
PPG SigmaCover 256 Base PPG SigmaCover 256 Hardener
Form: Liquid Liquid
Colour: Various Not available
Odour: Aromatic Amine-like
Odour Threshold: Not available Not available
pH-value 20°C: Insoluble in water. Insoluble in water.
Melting point/freezing point: May start to solidify at the following temperature: <-7°C (<19.4°F) This is based on data for the following ingredient: 4-nonylphenol, branched. Weighted average: -90.56°C (-131°F) May start to solidify at the following temperature: 12°C (53.6°F) This is based on data for the following ingredient: 3,6-diazaoctanethylenediamin. Weighted average: -84.56°C (-120.2°F)
Initial boiling point and boiling range: >37.78°C >37.78°C
Flash Point: Closed cup: 34°C Closed cup: 25°C
Evaporation Rate: Highest known value: 0.84 (ethylbenzene) Weighted average: 0.77compared with butyl acetate Highest known value: 0.84 (ethylbenzene) Weighted average: 0.71compared with butyl acetate
Flammability (solid, gas): liquid liquid
Upper/lower flammability or : explosive limits: Greatest known range: Lower: 1.48% Upper: 13.74% (1-methoxy-2-propanol)) Greatest known range: Lower: 1.7% Upper: 10.9% (2-methylpropan-1-ol)
Vapour pressure: Highest known value: <1.6 kPa (<12 mm Hg) (at 20°C) (2-methylpropan-1-ol). Weighted average: 1.02 kPa (7.65 mm Hg) (at 20°C) Highest known value: <1.6 kPa (<12 mm Hg) (at 20°C) (2-methylpropan-1-ol). Weighted average: 0.8 kPa (6 mm Hg) (at 20°C)
Vapour Density: Highest known value: 7.59 (Air = 1) (4-nonylphenol, branched). Weighted average: 3.74 (Air = 1) Highest known value: 5.04 (Air = 1) (3,6-diazaoctanethylenediamin). Weighted average: 3.17 (Air = 1)
Relative density: 1.48 0.95
Solubility(ies): Insoluble in the following materials: cold water Insoluble in the following materials: cold water
Partition coefficient: n-octanol/ water: Not applicable Not applicable
Auto-ignition temperature: 290°C Flash point 430°C
Decomposition temperature: Stable under recommended storage and handling conditions Stable under recommended storage and handling conditions
Viscosity: Kinematic (40°C): >0.21 cm² /s: 60 - 100 s (ISO 6mm) Kinematic (room temperature): >4 cm² /s: Kinematic (40°C): >0.21 cm² /s
Explosive properties: The product itself is not explosive, but the formation of an explosible mixture of vapour or dust with air is possible. The product itself is not explosive, but the formation of an explosible mixture of vapour or dust with air is possible.
Oxidising properties: Product does not present an oxidizing hazard Product does not present an oxidizing hazard



Health & Safety


  • This is a solvent-borne paint and care should be taken to avoid inhalation of spray mist or vapor, as well as contact between the wet paint and exposed skin or eyes.
  • For further information please see the safety data sheets in the attachments section above.

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Product Details
4788-779583

Data sheet

Manufacturer
PPG
For Use By
Professional Use
For Use On
Steel, Concrete, Galvanized Steel,
Application Method
Spray, Airless Spray, Brush, Roller
Sheen
Eggshell
Colour
Standard / Ready Mixed
Single, Two or Three Pack
Two-Pack
Pack Size
4L, 20L
Mixing Ratio
Base To Hardener 82:18
Dry to Handle (at 20°C)
6 hours
Fully Cured (at 20°C)
4 days
Pot Life (at 20°C)
8 hours
Coverage
6.3 m²/l for 100 μm (253 ft²/US gal for 4.0 mils)
Recommended Thinner/Cleaner
THINNER 91-92
Min. Application Temperature
(-10°C)
Density
1.4 kg/l (11.7 lb/US gal)
Solids by Volume
63 ± 2%
VOC
Directive 1999/13/EC, SED: max. 245.0 g/kg - UK PG 6/23(92) Appendix 3: max. 338.0 g/l (approx. 2.8 lb/US gal)
Shelf Life (from date of manufacture)
Base: at least 24 months when stored cool and dry Hardener: at least 24 months when stored cool and dry
Recommended Dry Film Thickness
75 - 150 μm (3.0 - 6.0 mils) depending on system
UN Number
UN1263
Dry to Handle (at 10°C)
12 hours
Pot Life (at 10°C)
16 hours
Fully Cured (at 10°C)
6 days
Pot Life
30°C (86°F) - 5 hours
Pot Life
35°C (95°F) - 4 hours
Pot Life
15°C (59°F) - 10 hours
Base Type
Solvent-Based
Base Type
Epoxy
Suitable For Use On
Concrete
Suitable For Use On
Steel
Suitable For Use On
Galvanised Steel
Suitable For Use On
Compatible Existing Coatings
Finish
Eggshell
Application Method
Brush
Application Method
Roller
Application Method
Spray
Usages
High Build
Usages
Flexible
Usages
Low Temperature
Usages
Atmospheric
Usages
Anti-Corrosive
Usages
Zinc Phosphate
Product Usage Type
Primer
Product Range
SigmaCover
Colour Family
Cream
Colour Family
Red
Dry to Recoat (@ 20-25°C)
3 hours
Categorised As
Metal Paints > Low Temperature Primers
Seasonal
Cold Weather
Attachments
Download


Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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IMPORTANT SHIPPING & DELIVERY INFORMATION

PPG SigmaCover 256 is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

All delivery costs below are excluding VAT


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