PPG SigmaShield 400

7745

SigmaShield 400, formerley known as Amerlock 400 GF, is a two-component, high solids polyamine adduct cured epoxy coating, designed to prevent corrosion under insulation (CUI) of carbon steel and stainless steel. Glass flake reinforced for improved impact and abrasion resistance.

  • Pass cryogenic cyclic test from -196°C (-321°F) to 200°C (392°F)
  • Excellent resistance to corrosion, for long-term protection at areas subject to heavy wear and tear
  • Very low water permeability, due to glass flake barrier; suitable for immersion service
  • Compatible with cathodic protection systems
  • Up to 750 µm (30.0 mils) DFT in a single coat
  • Withstands continuous heat up to 218°C (420°F)
  • Touch dry in 6 hours - refer below for more details on spreading rate and film thickness, overcoating intervals and curing times

**Available for delivery - see Delivery Options below**

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Size
Finish
£303.00
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£363.60 Tax incl.
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Description

SigmaShield 400, formerley known as Amerlock 400 GF, a two-component, high solids glass flake reinforced polyamine adduct cured epoxy coating designed to prevent corrosion under insulation (CUI) of carbon steel and stainless steel, for long-term protection at areas subject to heavy wear and tear.

The coating has very low water permeability (due to glass flake barrier), making it suitable for immersion service, and is compatible with cathodic protection systems. It has passed cryogenic cyclic test from -196°C (-321°F) to 200°C (392°F)



Features & Benefits


  • Formerley known as Amerlock 400 GF
  • Two-component
  • High solids
  • Reinforced high solids polyamine adduct cured epoxy
  • Designed to prevent corrosion under insulation (CUI) of carbon steel and stainless steel
  • Pass cryogenic cyclic test from -196°C (-321°F) to 200°C (392°F)
  • Glass-flake reinforced for improved impact and abrasion resistance
  • Excellent resistance to corrosion
  • Long-term protection at areas subject to heavy wear and tear
  • Very low water permeability, due to glass flake barrier
  • Suitable for immersion service
  • Compatible with cathodic protection systems
  • Up to 750 µm (30.0 mils) DFT in a single coat
  • Withstands continuous heat up to 218°C (420°F)
  • Touch dry in 6 hours
    • Refer below for more details on spreading rate and film thickness, overcoating intervals and curing times
  • Used by Utgrunden Offshore Wind Farm, Baltic Sea, protecting against seawater immersion, strong winds, breaking waves, ice formation



Product Data


Two-component, reinforced high solids polyamine adduct cured epoxy coating.

Epoxy coatings will chalk and fade with exposure to sunlight. Light colours are prone to ambering to some extent. Note that product tinted to custom colours are not recommended for immersion service. Only use factory grind batches for immersion

Data for mixed product
Number of components Two
Mass density 1.5 kg/l (12.5 lb/US gal)
Volume solids 87 ± 3%
VOC (Supplied) max. 172.0 g/l (approx. 1.4 lb/US gal)
Temperature resistance (Continuous) To 218°C (420°F)
Temperature resistance (Intermittent) To 232°C (450°F)
Recommended dry film thickness 200 - 750 µm (8.0 - 30.0 mils) depending on system
Theoretical spreading rate 4.4 m²/l for 200 µm (174 ft²/US gal for 8.0 mils)
Dry to touch 6 hours
Overcoating Interval Minimum: 24 hours
Maximum: 3 months
Full cure after 8 days
Shelf life Base: at least 24 months when stored cool and dry
Hardener: at least 36 months when stored cool and dry

Notes:

  • Refer below for more details on spreading rate and film thickness, overcoating intervals and curing times
  • Intermittent temperature resistance should be less than 5% of the time, and maximum 24 hours
  • Maximum temperature in table is for dry condition refer further below for "System Specification" for corrosion under insulation (CUI) conditions



Surface Preparation


Recommended Substrate Conditions and Temperatures

Substrate conditions

  • Previous coat must be dry and free from any contamination

Substrate temperature and application conditions

  • Coating performance is proportional to the degree of surface preparation. Remove all loose paint, mill scale, and rust
  • The surface to be coated must be dimensionally stable, dry, clean and free of grease, oil, and other foreign materials
  • When proper abrasive blast surface preparation is not practical, surfaces should be chipped clean and wire brushed to bare, clean material

 

Carbon Steel


  • For immersion service: steel; blast cleaned to ISO-Sa2½ (SSPC SP-10)
  • For atmospheric service, abrasive blast to ISO-Sa2½ or minimum SSPC SP-6, power tool cleaned to ISO-St3 (SSPC SP-3) or hand tool cleaned to ISO-St2 (SSPC SP-2) or ultra high pressure water jet to SSPC SP WJ-2(L) / NACE WJ-2(L)

 

Concrete / Masonry


  • 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
  • AMERCOAT 114 A may be used as a pit filler. Check with our Technical Team for an alternative
  • 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)
  • Alternatively, ASTM D4944 (Calcium Carbide Gas method) can be used, moisture content should not exceed 4%

 

Galvanized steel


  • Remove oil or soap film with detergent or emulsion cleaner
  • Lightly abrasive blast with a fine abrasive in accordance with SSPC SP-16 guidelines to achieve a profile of 1.5 – 3.0 mils (38 – 75 µm). When light abrasive blasting is not possible, galvanizing can be treated with a suitable zinc phosphate conversion coating.
  • Galvanizing that has had at least 24 months of exterior weathering may be coated after power washing to remove all contaminants and white rust

 

Non-Ferrous Metals and Stainless Steel


  • Remove all rust, dirt, moisture, grease or other contaminants from the surface
  • Lightly abrasive blast with a fine abrasive in accordance with SSPC SP-16 guidelines to achieve a profile of 40 - 100 µm (1.5 - 4.0 mils)

 

Substrate Temperature


  • Substrate temperature during application and curing should be above 10°C (50°F)
  • Substrate temperature during application and curing should be at least 3°C (5°F) above dew point



System Specification


Insulated and non-insulated service:

Applied direct to carbon steel or stainless steel up to 204°C (400°F)

  • Amerlock 400 GF / SigmaShield 400 : 250 µm (10.0 mils) DFT one coat system

Notes:

  • Do not exceed 400 μm (16.0 mils) total DFT
  • Top coat needed for exposure in direct sunlight conditions. Please contact our technical team for suitable top coats
  • For carbon steel surface treatment, ISO-Sa2½ or min. SSPC SP-6 is recommended. But SSPC SP-15 is allowed for repair
  • For hot application from 66°C (150°F) to 150°C (300°F), please refer to "HOT APPLY EPOXIES" information sheet



Application


Instructions for Use

Mixing ratio by volume: base to hardener 50:50 (1:1)

  • 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
  • Very good mechanical mixing of base and hardener is essential
  • Thinner should be added after mixing the components
  • Filters should be removed from spray equipment

 

Air Spray


Recommended thinner

Volume of thinner

  • 6 - 10%, depending on required thickness and application conditions

Nozzle orifice

  • 1.5 – 2.0 mm (approx. 0.060 – 0.079 in)

Nozzle pressure

  • 0.3 - 0.4 MPa (approx. 3 - 4 bar; 44 - 58 p.s.i.)

 

Airless Spray


Recommended thinner

Volume of thinner

  • 0 - 5%

Nozzle orifice

  • Approx. 0.53 – 0.79 mm (0.021 – 0.031 in)

Nozzle pressure

  • 19.0 - 22.5 MPa (approx. 190 - 225 bar; 2756 - 3264 p.s.i.)

 

Brush/roller


  • Only for touch-up and spot repair
  • Due to thixotropy, it is difficult to obtain a smooth film by brush, although this does not affect performance

Cleaning solvent

 

Spreading Rate and Film Thickness


Theoretical spreading rate

DFT Theoretical Spreading Rate
200 µm (8.0 mils) 4.4 m²/l (174 ft²/US gal)
750 µm (30.0 mils) 1.2 m²/l (47 ft²/US gal)

 

Overcoating Interval for DFT up to 300 µm (12.0 mils)


Overcoating with... Interval 10°C (50°F) 20°C (68°F) 30°C (86°F) 40°C (104°F)
Various two-component epoxy coatings Minimum 36 hours 16 hours 10 hours 8 hours
Maximum 3 months 3 months 3 months 1 months
Polyurethanes Minimum 36 hours 16 hours 10 hours 8 hours
Maximum 1 month 1 month 14 days 7 days

Note:

  • Surface should be dry and free from any contamination
  • Adequate ventilation must be maintained during application and curing (please refer to information sheets 1433 and 1434)

 

Curing time for DFT up to 300 µm (12.0 mils)


Substrate temperature Dry to Touch Dry to Handle Full Cure
10°C (50°F) 24 hours 48 hours 21 days
20°C (68°F) 6 hours 20 hours 8 days
30°C (86°F) 4 hours 12 hours 4 days

Notes:

  • Adequate ventilation must be maintained during application and curing

 

Pot Life (at application viscosity)


Mixed product temperature Pot life
10°C (50°F) 3 hours
20°C (68°F) 2 hours
30°C (86°F) 1 hour



Safety Precautions


  • For paint and recommended thinners, see the relevant Material Safety Data Sheets in the attachments section above
  • 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



References


Product Details
7745

Data sheet

Manufacturer
PPG
For Use On
Galvanized Steel, Concrete, Masonry
Application Method
Brush, Roller, Spray
Sheen
Eggshell
Colour
Standard / Ready Mixed
Single, Two or Three Pack
Two-Pack
Pack Size
20L
Parts
Two
Base Type
Glass flake reinforced polyamine cured
Solvent
Solvent-borne
Mixing Ratio
1:1
Suitable Substrates
Carbon Steel, Stainless Steel, Concrete
Key Features
Designed to prevent corrosion under insulation (CUI) of carbon steel and stainless steel, excellent resistance to corrosion
Application
Brush, Roller, Spray
Touch Dry (at 20°C)
6 hours
Dry to Handle (at 20°C)
20 hours
Dry to Recoat (at 20°C)
Minimum: 24 hours. Maximum: 3 months
Fully Cured (at 20°C)
After 8 days
Pot Life (at 20°C)
2 hours
Coverage
4.4 m2/I for 200 µm (174 ft2/US gal for 8.0 mils)
Recommended Thinner/Cleaner
PPG Thinner 21-06, PPG Thinner 90-58
Unit Contents
-
Compatible Primers
-
Compatible Topcoats
-
Max. Application Temperature
-
Min. Application Temperature
10°C (50°F)
Density
1.5 kg/I (12.5 lb/US gal)
Solids by Volume
87 ±3%
Heat Resistance (up-to)
218°C (420°F) (continuous)
VOC
max. 172.0 g/I (approx. 1.4 lb/US gal)
Shelf Life (Once Opened)
Base: at least 24 months when stored cool and dry. Hardener: at least 36 months when stored cool and dry
UN Number (Activator)
UN3470
UN Number (Base)
UN1263
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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