AMERCOAT 68 HS epoxy zinc-rich primer 68HS

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Key properties

• Zinc dust content by weight in the dry film exceeds 80%
• Excellent anti-corrosion properties
• Short coating drying time, suitable for quick overcoating of the subsequent coat.
• For low-temperature curing, the drier AMERCOAT 861 may be added

Colour and gloss

• Red-grey
• Flat

Parameters after mixing

Curing agent: at least 24 months stored in a dry, cool environment; powder: at least 24 months stored in a dry, cool environment

Notes

• See supplementary parameters — recoat interval table
• See supplementary parameters table — curing time table
• The coating may discolour as the temperature rises
• Cumulative time at peak temperature shall not exceed 5% of the total service time, or at most 24 hours per occurrence.

Recommended substrate condition and temperature

• The final coating performance is normally proportional to the quality of the preceding surface preparation. All old coated surfaces must be clean and dry.

Bare steel

• Blast clean with angular abrasive to at least SSPC SP-6, with roughness 25–75 µm (1.0–3.0 mil).
• A high surface profile of up to 125 µm (5 mil) is acceptable, but the coating thickness shall be increased accordingly, with a dry film thickness of at least 65 µm (2.5 mil).
• Coat as soon as possible after surface preparation to avoid rust bloom.
• Before coating, protect the surface from re-contamination by moisture, oil, grease and other organic matter.
• For small-area repair and manual stripe coating, power-tool preparation to SSPC SP-3 is acceptable; for larger areas where blasting is truly not possible,

SSPC SP-11 is accepted for such site conditions.

Substrate temperature and application conditions

• During application, the surface temperature shall be controlled between 40 °F (4 °C) and 120 °F (49 °C).
• With drier: during application, the substrate surface temperature shall be controlled between 32 °F (0 °C) and 100 °F (38 °C).
• During application, the substrate surface temperature shall be at least 5 °F (3 °C) above the dew point
• During application and curing, the relative humidity must not exceed 85%

Notes

• When applying in low-temperature winter conditions, take extra care to ensure the surface does not freeze.
• At low temperatures down to a substrate surface temperature of 40 °F, application is possible without drier, but during application the paint temperature must be maintained at 60 °F to

90 °F. Without drier, the full curing time of the coating is long at such low temperatures, so it is recommended to keep the site ambient temperature above 50 °F within 12 hours after application. In addition, freshly applied coatings shall be protected from moisture or condensation before the coating is hard dry.

• Where abrasive blasting is truly not possible on site, power-tool preparation to SSPC SP-11 (St 3 of the international standard ISO 8501-1) is acceptable.

Coating system specification

• Primer: can be applied directly to metal substrate surfaces, and can also be used for local repair of inorganic zinc silicate primer coatings, such as the D9 series inorganic zinc silicate primers.
• Topcoat: can be used with aliphatic polyurethane topcoat AMERSHIELD, polysiloxane topcoat PSX 700, aliphatic polyurethane topcoat 450H, fast-drying high-solids epoxy 2/400,

multipurpose epoxy 385, fast-drying multipurpose epoxy 370, AMERCOAT epoxy series, PITTGUARD epoxy series, DURATHANE DTM, PITTHANE ULTRA.

Secondary surface preparation

• During storage, transport, cutting and prefabrication, the surface of the prefabrication shop primer shall be protected from contamination.

As marked on the packaging drum

• Using an air-driven mixer at medium speed, first stir the base component uniformly in the drum. Then slowly add the curing agent to the base drum and continue stirring for 1–2 minutes until

the curing agent is thoroughly dispersed and uniformly distributed in the base component. Then, while stirring, slowly add the powder component until the three components are completely homogeneous. Finally, strain the mixed paint through a 30-mesh screen/filter into a separate clean empty drum to remove poorly dispersed lumps.

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 shall be controlled between 50 °F (10 °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.
• Independent regulators are recommended for the air and material lines, and an oil/water separator shall be installed on the main air supply line.
• Conventional spray equipment

Airless spray (single-feed pump)

• A spray pump with a pressure ratio of at least 45:1

Brush/roller

• High-quality natural-bristle brushes shall be used. Brushing is limited to local small-area touch-up and manual stripe coating. Roller application is not recommended.
• When brushing/rolling, load fully without dripping to avoid entrapping air bubbles. If bubbles appear in the wet film, immediately brush them out. To achieve a suitable film thickness,

(usually the film thickness of one spray pass), brush/roller application may require multiple passes.

Supplementary parameters

Recoat interval schedule for a 75 µm (3.0 mil) dry film

Notes

• If surface contaminants including zinc salts must be removed, wash with high-pressure fresh water. Ensure the surface is clean and dry before coating.
• May be overcoated after routine simple surface cleaning, without abrading

Recoat interval schedule for a 75 µm (3.0 mil) dry film after adding drier AMERCOAT 861

Notes

• If surface contaminants including zinc salts must be removed, wash with high-pressure fresh water. Ensure the surface is clean and dry before coating.
• This product is also suitable for forced curing by heating [oven temperature 140 °F (60 °C) to 180 °F (82 °C)]; the coating needs only 5–15 minutes of heating to cure

before overcoating can proceed. Allow 5–10 minutes of levelling and flash-off before entering the oven at 120 °F (49 °C). Adding drier AMERCOAT 861 is also recommended for this process.

• May be overcoated after routine simple surface cleaning, without abrading

Curing schedule for a 75 µm (3.0 mil) dry film

Curing schedule for a 75 µm (3.0 mil) dry film after adding drier Amercoat 861

Pot life (at normal application viscosity)

After adding drier Amercoat 861

Product certifications

• RCSC-certified Class B slip coefficient, suitable for high-strength bolted connections
• Complies with the requirements of Type II and Level 2 of SSPC Paint 20
• Zinc dust pigment complies with ASTM D520 Type 2 quality grade

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.

Supply packaging: 1-gallon kit and 4-gallon kit

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