PPG SIGMACOVER 280 LT Multi-purpose General-purpose Epoxy Anti-corrosive Primer

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Introduction

A multi-purpose, universal epoxy anti-corrosive primer based on pure epoxy technology.

Key properties

• A multi-purpose epoxy primer used in conventional protective coating systems for steel and non-ferrous metals.
• Excellent adhesion to non-ferrous metals, galvanised surfaces, shop primer coatings and steel surfaces.
• Can be used as a sealer or intermediate tie coat, recommended dry film thickness 25–40 µm (1.0–1.6 mils)
• Suitable for use in immersed areas.
• Suitable for repair of welds and damaged epoxy coatings during construction.
• Compatible with well-designed cathodic protection systems.
• Curing temperature may be as low as -10 °C (14 °F).

Colour and gloss

• Yellow/green.
• Low gloss.

Notes

• When epoxy coatings are used in exposed conditions, consider applying a UV-resistant topcoat

Basic data, 10 °C (50 °F)

Parameters after mixing

UK PG 6/23(92) Appendix 3: maximum 438.0 g/L (approx. 3.7 lb/US gal).

5.7 m²/L at 100 µm (229 ft²/US gal at 4.0 mils).

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.

Recommended substrate condition and temperature

• Apply this product as soon as possible after the surface preparation meets the standard, and achieve the specified dry film thickness.

Atmospheric exposure environment

• Bare steel: abrasive blast clean to ISO Sa 2½ with a surface roughness of 40–70 µm (1.6–2.8 mils), or power tool clean to at least ISO St 3.
• Shop-primed steel: prepare to Pt3 (SPSS).

Galvanised surfaces

• Surface preparation must be carried out properly; the surface must be dry, clean and free of contaminants before application.
• The surface must be fully and thoroughly roughened by sweep blasting to a uniform semi-matt appearance.
• Sweep blast cleaning must meet SSPC-SP 16.

Stainless steel

• Surface preparation must be carried out properly; the surface must be dry, clean and free of contaminants before application.
• Use an inert non-metallic abrasive to fully and thoroughly roughen the surface by sweep blasting.
• Sweep blast cleaning must meet SSPC-SP 16.

Thermally sprayed metal surface (TSM)

• The substrate surface must be clean, dry and free of all contaminants.
• The coating process requires a thin mist coat for sealing first, followed by normal full application. For the thinning ratio of the mist-coat sealer, refer to the relevant recommendations in the application instructions below.

• Dried for at least 28 days in a well-ventilated environment.
• The internal moisture content must not exceed 4.5%.
• The concrete substrate must be sound, clean, dry and free of all laitance and contaminants.
• Existing coatings inside the pipeline shall first be removed with a scraper and solvent.

Immersion environment

• Bare steel, or steel coated with unapproved inorganic zinc silicate shop primer; blast cleaning to Sa2½ of ISO, with a profile of 30–75 µm (1.2–3.0 mil).
• Existing coatings inside the pipeline shall first be removed with a scraper and solvent.

Substrate temperature and application conditions

• During application and curing, the substrate temperature shall be maintained between -10 °C (14 °F) and 15 °C (59 °F).
• During application and curing, the substrate temperature must be at least 3 °C (5 °F) above the dew point.
• The minimum ambient temperature suitable for application can be as low as -10 °C (14 °F), but in this case the coating will take longer to reach the expected hard dry; once the temperature returns to a suitable level, the coating can still cure completely.
• During application, the relative humidity shall not exceed 85%.

Instructions for use

Mixing ratio by volume: base : curing agent = 4:1

• 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.
• Excessive thinning may reduce the sag resistance of the wet film, slow hard drying and even reduce strength.
• The thinner should be added after the two components are mixed.

Notes

• See supplementary parameters — pot life after mixing.

Air spray

Airless spray (single-feed pump)

Notes

• When used as a sealer or intermediate tie coat, the applied dry film thickness is 25–40 µm (1.0–1.6 mils), and the maximum thinner amount can be up to 30% of the total volume.

Brush/roller

Cleaning solvent

• THINNER 90-53

Supplementary parameters

Film thickness and theoretical spreading rate

Notes

• Note: maximum dry film thickness for brush application: 50 µm (2.0 mils).

Recoat time for a coating at 75 µm (3.0 mils) dry film thickness

Notes

• The surface must be clean, dry and free of all contaminants.

Curing time for a coating at 75 µm (3.0 mils) dry film thickness

Notes

• Adequate and continuous ventilation must be maintained during application and curing of the coating.

Pot life (at normal application viscosity)

Safety Precautions

• Refer to the Material Safety Data Sheet and product package labelling for full details of the stated safety precautions and protective measures
• This is a solvent-borne coating. Avoid inhaling spray and solvent vapours, and avoid contact of uncured paint with skin and eyes

Worldwide applicability

Although PPG Protective & 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

• Information sheet | Explanation of product data sheets

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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