AMERLOCK 2 SIGMACOVER 2 fast-drying high-solids epoxy coating 2

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Key properties

• Low-temperature curing down to 0 °C (32 °F).
• High-performance general-purpose epoxy that can also serve directly as a primer
• High solids, low VOC
• Accepts low surface preparation and is abrasion resistant
• Accepts surfaces that have undergone appropriate surface preparation but are still damp
• Generally exhibits good adhesion to most existing coating surfaces
• Good resistance to splash and spill contamination from various chemicals
• Complies with US NSF Standard 61, suitable for tanks, piping, valves and fittings (manufactured in the USA only)
• Suitable for coating lining protection of railway freight cars and locomotive underframes; can be applied directly to metal substrates.

Colour and gloss

• Various standard primer colours; custom colours also available upon customer request
• Semi-gloss

Note: Epoxy coatings will chalk and fade over time under prolonged sunlight exposure. Light-coloured coatings generally tend to yellow to some degree. In addition, for custom-colour products, due to possible pigment limitations, use in underwater immersion areas is not recommended. Only products that are factory sanded without tint paste colour adjustment are suitable for underwater immersion areas.

Basic data at 10 °C (50 °F)

Parameters after mixing

Maximum 163.0 g/L (approx. 1.4 lb/gal) (theoretical calculated value); 1.5 lb/gal (180.0 g/L) (US EPA Method 24)

Curing agent: at least 36 months stored in a dry and cool environment

Notes

• See the supplementary data sheet — theoretical spreading rate versus dry film thickness table
• See supplementary parameters — recoat interval table
• See supplementary parameters table — curing time table
• To meet the requirement of VOC below 100 g/L, the fast-drying multi-purpose epoxy 2 VOC version can be supplied through internal adjustment.
• The fast-drying multi-purpose epoxy 2 VOC version is supplied only in the USA and Canada.
• Intermittent peak temperatures shall total less than 5% of the operating time, and a single peak shall last no more than 24 hours.
• This is the heat resistance of the coating in a dry atmosphere; for immersion conditions, consult the PPG technical representative.

Recommended substrate condition and temperature

• The performance of the coating depends mainly on the quality grade of prior surface preparation, and is essentially proportional to it. Therefore, before coating, remove all poorly adhered old coatings, oxidation

scale and rust. The surface to be coated shall be sound, clean and dry, with all oil, grease and other contaminants removed. Where no abrasive blasting is possible on site, chipping to remove rust, followed by wire brushing and cleaning of the bare substrate surface, is acceptable.

Carbon Steel

• For immersion service: bare steel; abrasive blast cleaning to Sa2½ of ISO 8501-1 (SSPC SP-10).
• For atmospheric exposure, abrasive blast cleaning to Sa2½ of ISO 8501-1 or at least SP6 of SSPC; power-tool cleaning to the international

St3 of ISO 8501-1 (SSPC SP-3), or hand cleaning to St2 of ISO 8501-1 (SSPC SP-2), or ultra-high-pressure water jetting to WJ-2(L) of SSPC VIS 4 / WJ-2(L) of NACE VIS 7.

Concrete/masonry surfaces

• Remove oil, grease and all other contaminants in accordance with ASTM D4258.
• Abrade in accordance with ASTM D4259 to remove glaze or laitance and achieve roughness ICRI CSP 3 to 5.
• If necessary, pores may be filled with Epoxy Filler 114A by putty-type filling.
• Recommended maximum moisture vapour transmission rate is 3 lb/1000 ft²/24 h, determined by (ASTM F1869 calcium chloride test method or ASTM D4263 plastic sheet test

method) moisture vapour transmission testing.

• Alternatively, ASTM D4944 (calcium carbide gas method) may be used; the moisture content shall not exceed 4%.

Galvanised surfaces

• Oil or soap films may be removed with detergent or emulsion
• Light sweep blast cleaning with fine abrasive to SSPC SP-16, achieving a profile of 40–75 µm (1.5–3.0 mil). If sweep blasting is not possible on site,

apply a conversion-type phosphating wash primer instead.

• For galvanized surfaces weathered outdoors for at least 12 months, remove all contamination and white rust by high-pressure water washing before coating.

Non-ferrous metals (non-magnetic) and stainless steel

• Remove all rust, dust, moisture, oil, grease and other contaminants from the surface.
• Light sweep blast cleaning with fine abrasive to SSPC SP-16, achieving a profile of 40–100 µm (1.5–4.0 mil).

Old coatings and repair

• The confirmed compatible existing coating must be dry and clean, with no residual contaminants.
• For previous coats that are single-component coatings, additional precautions are required.

Substrate Temperature

• Substrate temperature shall be maintained between -5 °C (23 °F) and 50 °C (122 °F) during application and curing.
• During application and curing, the substrate temperature must be at least 3 °C (5 °F) above the dew point

Coating system specification

• Primers: may be applied directly to metal substrates, DIMETCOTE series inorganic zinc primers, AMERCOAT 68 series epoxy zinc-rich primers, AMERLOCK 2/400 series,

SIGMAZINC series zinc-rich primers, AMERCOAT series epoxies and SIGMA series epoxies.

• Topcoat: AMERCOAT 450 series polyurethane topcoat, SIGMADUR series polyurethane topcoat, SIGMACOVER series epoxy, AMERCOAT series epoxy,

Polyurethane topcoat AMERSHIELD and PSX polysiloxane topcoat.

Note: For the use of other suitable primers, consult a PPG technical representative.

Instructions for use

Mixing ratio by volume: base : curing agent = 50:50 (1:1)

• Stir and mix before use, preferably with a power mixer, to ensure thorough mixing.
• Add the curing agent to the base component and stir continuously until the two components are thoroughly mixed and fully homogeneous.

Induction Time

Induction time after mixing

Air spray

Airless spray (single-feed pump)

Nozzle tip size

Approx. 0.48 mm (0.019 in)

Brush/roller

• Load the brush or roller with paint appropriately and apply with uniform, steady pressure.
• May be applied by brush or roller, achieving a dry film thickness of about 80 µm (3.1 mil) per coat.

Supplementary parameters

Film thickness and spreading rate

Overcoating interval schedule for a 200 µm (8.0 mil) dry film thickness

Notes

• The surface must be clean, dry and free of all contaminants.
• For coatings exposed for more than 30 days, clean the surface with PREP 88, SIGMARITE 88 or an equivalent detergent.
• If the maximum overcoating interval is exceeded, the surface shall be abraded.
• Alkyd and water-borne acrylic coatings shall be applied only after the coat is hard dry, but not beyond 3 times the hard-dry time.
• The maximum overcoating interval depends mainly on the actual surface temperature, rather than simply the ambient air temperature. Under direct sunlight or surface heating, the maximum overcoating interval of the coating

will be shortened.

Curing schedule for a 200 µm (8.0 mil) dry film thickness

Note: ensure continuous, adequate ventilation during application and curing (see Safety Sheet 1433 and Information Sheet 1434). Pot life after mixing (at suitable application viscosity)

Product certifications

• Pre-qualified in accordance with the requirements of NORSOK M501 Edition 5, Coating System 7, for use in seawater immersion service.
• Complies with USDA requirements for incidental food contact
• Class A certified by the US National Fire Protection Association (NFPA), suitable for environments requiring low flame spread and low smoke
• Certified by an authoritative body as conforming to the requirements of ANSI/NSF Standard 61 (potable water contact). For applications requiring compliance with NSF specifications, visit the following

web page for relevant information: http://www.nsf.org/certified-products-systems/

• Certified to AWWA D102-06 ICS #1, #2, #3, #5
• Nuclear-grade Level 2 (ANSI N 5.12, ANSI N 101.2)
• Complies with LEED requirements and is listed in its anti-corrosion coatings directory

Safety Precautions

• For the coating and its recommended thinners, see Safety Sheets 1430 and 1431 and the relevant Material Safety Data Sheet
• This is a solvent-borne coating. Avoid inhaling spray mist and solvent vapours, and avoid contact of uncured paint with skin and eyes.

Worldwide

Although PPG Protective and Marine Coatings is committed to providing completely consistent products to users worldwide, from time to time it may be necessary to make minor adjustments to specific products to comply with local/national regulations or environmental requirements. In the following cases, use the corresponding alternative version of the product data sheet instead.

Reference information

• For the conversion table, refer to Information Sheet 1410
• For product data, refer to Information Sheet 1411
• For safety guidance, refer to Information Sheet 1430
• Safety and health in confined spaces | explosion hazard — toxic hazard: refer to Information Sheet 1431
• For safe working in confined spaces, refer to Information Sheet 1433
• For ventilation guidance, refer to Information Sheet 1434
• For steel surface preparation, refer to Information Sheet 1490
• For mineral abrasive specifications, refer to Information Sheet 1491
• For concrete (floor) surface preparation, refer to Information Sheet 1496
• For relative humidity, substrate temperature and air temperature, refer to Information Sheet 1650

Quality guarantee

PPG warrants (1) that it has good title to the product, (2) that the product quality conforms to the relevant technical quality specifications in force at the date of manufacture of the product, and (3) that the supplied product is free of lawful claims by third parties for infringement of US patent rights. The above warranties are limited to those given by PPG and other express or implied warranties required by applicable laws and regulations for transactions and commercial practice; any abuse contrary to the stated conditions, and any other warranty for special purposes or uses, are excluded, and PPG shall be free from liability. To claim under this warranty, the buyer must notify PPG in writing within five (5) days of discovering the quality defect, and the date must be within the product's valid storage period or within one (1) year from delivery of the product to the buyer.

If the buyer fails to notify PPG of the defect as required above, this will prejudice the buyer's right to obtain compensation under this warranty from PPG!

Limitation of liability

In all cases, PPG shall not be liable for any indirect, special, incidental or consequential loss of any kind arising from or in connection with the use of this product (whether based on negligence, strict liability or tort).

The information in this product data sheet is based on laboratory tests we believe to be reliable, and is provided for guidance only. PPG may revise this information at any time as experience accumulates and product development progresses.

All recommendations and advice concerning the use of this product, whether in technical documents, in response to an enquiry or otherwise, are given to the best of our knowledge and are believed to be reliable. Our products and related information are provided for industrial users possessing the necessary knowledge and practical skills, and it is the end user's responsibility to determine whether the product is suitable for the specific use. The buyer, having performed such evaluation, proceeds entirely at its own risk.

The quality and condition of the substrate on site, and the many other factors affecting product use and application, are beyond PPG's control. Therefore, PPG accepts no liability for any loss, injury or damage arising from the use of the information in this product data sheet (unless otherwise provided in a written agreement). Different application environments, changes to the application process or extrapolation of the reference data may result in failure to achieve the expected coating quality.

This product data sheet supersedes all previous versions. The buyer is responsible for confirming that the data sheet in hand is the latest version before using the product. The latest version is published on the official website of PPG Protective & Marine Coatings:

www.ppgpmc.com. In case of discrepancy between the Chinese version and the original English version of the product data sheet, the English original shall prevail.

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