AMERSHIELD aliphatic polyurethane coating Amershield

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Introduction

A two-component polyester-acrylic aliphatic polyurethane topcoat.

Key properties

• High weathering performance, with particularly good colour and gloss retention.
• High-solids, low VOC.
• The film is strong yet flexible, and abrasion-resistant.
• Resistant to splashes of mineral oil, vegetable oil, white spirit, paraffin, aliphatic petroleum products and mild chemicals.
• For C1 and C2 atmospheric environments as defined by ISO 12944, it can be applied directly to metal or concrete substrates.
• Meets Level 3 of SSPC Paint 36.

Colour and gloss

• Standard colours are available, and various colours can be customised to customer requirements.
• Gloss.

Notes

• For certain topcoat colours, such as red,

orange and yellow, production cost may increase due to the need for enhanced hiding power, especially when these topcoats are overcoated over primers of clearly contrasting colour, which requires close attention.

• Yellow, red and orange topcoats, due to the switch to lead-free pigments, may fade earlier than the original leaded same colours or other lead-free colours.

Basic data at 20 °C (68 °F)

Parameters after mixing

UK PG 6/23(92) Annex 3: max 185.0 g/L (approx. 1.5 lb/US gal).

264.0 g/L (2.2 lb/gal) (US EPA Method 24).

Maximum: 7 days.

Curing agent: at least 24 months; store 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.
• For specifications requiring VOC below 100 g/L, the AMERSHIELD -VOC version can be used by internal adjustment.
• The AMERSHIELD VOC version is produced only in US and Canadian plants.

Recommended substrate condition and temperature

• The coating performance quality depends on the thoroughness of surface preparation, in general positive proportion. For application essentials, refer to the relevant primer and intermediate

coat application procedures and coating curing process parameters.

Substrate condition

• Bare steel: abrasive blast-clean to Sa 2½ of ISO 8501-1 or at least SSPC-SP6, with a profile of 30–75 µm (1.2–3.0 mils).
• Concrete/masonry: refer to the relevant dedicated primer.
• The previous coat (epoxy or polyurethane) must be clean, dry and free of all contaminants.

Galvanized and aluminium surfaces

• The surface shall be clean, with all oil, grease, soluble salts and other contaminants removed.
• The surface shall be adequately roughened (e.g. by abrading and sweep blasting).

Substrate temperature and application conditions

• The minimum acceptable substrate surface temperature during application and curing is -5 °C (23 °F).
• During application and curing, the substrate temperature must be at least 3 °C (5 °F) above the dew point.
• During application and curing, the relative humidity must not exceed 85%.
• The coating shall not be exposed to rain or condensation too early, otherwise its colour and gloss will be affected.

Coating system specification

• Compatible primers: can be applied directly to the substrate; AMERCOAT 68 series epoxy zinc-rich, SIGMAZINC series zinc powder primers, AMERLOCK series reinforced ep

oxy, AMERCOAT and SIGMA series epoxy coatings.

• For primers not listed above, consult the PPG technical service representative.

Instructions for use

Mixing ratio by volume: base : curing agent = 80 : 20.

• Pre-mix the base component in the pail with a pneumatic mixer at medium speed. Then, while stirring the base component, slowly

pour in the hardener component until fully added, then continue stirring for 2–3 minutes to ensure the hardener is thoroughly dispersed and the whole is homogeneous.

• Ensure the mixed paint temperature of the base and curing agent is above 10 °C (50 °F); otherwise, additional thinner may be required to adjust the paint viscosity

to a state suitable for site application.

• The thinner should be added after the two components are mixed.
• Excessive thinning generally reduces the sag resistance of the wet film.

Induction Time

Not required.

Air spray

Airless spray (single-feed pump)

Brush/roller

• Roll with a high-quality, durable, solvent-resistant short-nap roller (0.25–0.375 in / 64–95 mm). Add AMERCOAT 851 if necessary

levelling additive to enhance wet-film wetting and levelling, improving edge curl and roller marks.

• With roller application, multiple passes may be required to achieve the specified film thickness and reliable coverage.

Supplementary parameters

Film thickness and spreading rate

Recoat interval for a coating at 150 µm (6.0 mils) dry film thickness

Curing time table for a coating at 150 µm (6.0 mils) dry film thickness

Notes

• The ranges represent drying times with and without PPG 866M (Amercoat 866M) accelerator respectively.
• The parameters at -5 °C and 0 °C are only for cases with PPG 866M (AMERCOAT 866M) accelerator added.
• Adequate and continuous ventilation must be maintained during application and curing of the coating.
• The coating must not be exposed to rain or surface condensation too early, otherwise its colour and gloss may change.

Pot life after mixing (at suitable application viscosity)

Notes

• Times are longer at lower temperatures and shorter at higher temperatures.
• Adding PPG 866M (AMERCOAT 866M) accelerator halves the pot life.

Product certifications

• Complies with USDA requirements for incidental food contact.
• For nuclear power environments, Level 2 (localised).
• Low flame-spread performance complying with Class A of the NFPA standard.

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.
• Contains a toxic polyisocyanate curing agent.
• Avoid inhaling spray mist.

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.
• For safety and health in confined spaces and 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 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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