AMERCOAT 450H aliphatic polyurethane topcoat 450 H

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Key properties

• A high-gloss topcoat with no maximum overcoating interval
• Excellent weathering resistance, with particularly good colour and gloss retention
• Highly VOC-compliant
• The film is tough and flexible, and abrasion-resistant
• Suitable over a broad temperature range for film curing

Colour and gloss

• Standard colours, various safety colours, and custom colours available on request.
• Gloss

Basic parameters — at 20 °C (68 °F)

Parameters after mixing

Curing agent: at least 24 months; store in a dry and cool environment

Notes

• See supplementary parameters — recoat interval table
• See supplementary parameters table — curing time table
• The coating may discolour as the temperature rises
• Intermittent peak temperatures shall total less than 5% of the operating time, and a single peak shall last no more than 24 hours.
• Applying in multiple passes can increase the dry film thickness of a single coat. A film built up in this way can accumulate a wet film equivalent to 127 µm (5 µm) of dry film. In this case

the coating in the wet-film state may require some additional standing time

Recommended substrate condition and temperature

• The final performance of the coating depends on the quality of prior surface preparation, and is roughly proportional to it. Refer to the curing parameters of the compatible primer and intermediate coat, and

other technical requirements for application. For certain epoxy coatings, before overcoating with this product, check that the surface is free from defects such as amine bloom, and is clean and dry with all contamination removed. In addition, both the primer and the intermediate coat shall follow the minimum and maximum overcoating intervals of each product. Aged epoxy old coatings shall be abraded. For unknown old coatings of uncertain nature, it is recommended to apply a small trial patch before overcoating.

Substrate temperature and application conditions

• During application, the surface temperature should be controlled between 20 °F (-7 °C) and 120 °F (49 °C).
• During application, the substrate surface temperature shall be at least 5 °F (3 °C) above the dew point
• During application and curing, the ambient temperature shall be controlled between 20 °F (-7 °C) and 120 °F (49 °C).
• During application and curing, the relative humidity must not exceed 85%

Coating system specification

• Primers: epoxy zinc-rich 68 HS, epoxy zinc-rich 68 MCZ, fast-dry multipurpose epoxy 370, multipurpose epoxy 385, AMERCOAT 399, high-solids

fast-dry epoxy 2/400, PITTGUARD series epoxy.

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

• First disperse-stir the base component in the container with an air-driven stirrer at medium speed until uniform, then, while stirring, slowly add

the curing agent component until it is all added, and continue stirring for 1–2 minutes to ensure the curing agent is thoroughly dispersed in the base component and a homogeneous state is reached.

Application

• Mask off the application area to prevent airborne dust settlement and other contamination.
• Ensure continuous, adequate ventilation throughout application and curing
• During spray application, provide necessary shielding at draughty areas.

Material temperature

During application and curing, the temperature should be controlled between 40 °F (4 °C) and 90 °F (32 °C).

Air spray

• An oil/water separator shall be installed on the main line. The product is particularly moisture-sensitive; moisture protection shall be emphasised.
• Conventional spray equipment

(AMERCOAT 923)

• A spray pump with a pressure ratio of at least 28:1
• It can also be applied with a two-component spray pump.

Brush/roller

• Use high-quality natural bristle brushes and/or solvent-resistant 1/4 in or 3/8 in short-pile rollers. Ensure that the brush or roller is firm and fully loaded, to reduce entrapment and

retained air. To achieve the desired thickness, repeated brushing/rolling may be required.

• The wetting and levelling of the wet film during brush and roller application can be improved by adding the dedicated levelling agent AMERCOAT 851.
• When brushing/rolling, load the brush or roller fully without dripping, to avoid entrapped air bubbles. If bubbles appear in the wet film, repair them immediately with the brush. To achieve a suitable film thickness (normally

the film thickness of a single spray pass), repeated application may be required when brushing/rolling.

Supplementary parameters

Overcoating interval table for coatings at 51 µm (2.0 mil) dry film thickness

Overcoating interval table for coatings at 51 µm (2.0 mil) dry film thickness after addition of accelerator 866M (Amercoat 866M)

Curing schedule for coatings at 50 µm (2 mil) dry film thickness

Note: the full cure shown in the curing schedule on the data sheet means, for most service conditions and for normal purposes, that the main curing reaction of the coating has essentially completed and the coating has developed its designed key properties; however, the chemical reaction within the coating continues to deepen, further enhancing the physical properties and chemical resistance of the coating.

Curing schedule for coatings at 51 µm (2.0 mil) dry film thickness

Curing schedule for coatings at 50 µm (2.0 mil) dry film thickness after addition of the dedicated accelerator 866M

Note: the addition of accelerator 866M will significantly shorten the pot life of the mixed material (at normal application viscosity).

Note: with accelerator 866M, the pot life of the mixed material is normally reduced to about half.

Product certifications

• Complies with USDA requirements for incidental food contact
• The performance quality of the coating meets Level 3 of SSPC Paint 36.

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

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.

Packaging: 1-gallon and 5-gallon drums

Note: * only colours currently available in the UCD V-Line tinting machine

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