PPG SIGMAFAST 278 Two-component High-solids Epoxy Zinc Phosphate Primer/Intermediate

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Introduction

A two-component, high-solids epoxy zinc phosphate primer/intermediate coat.

Key properties

• May be used as an epoxy primer or intermediate coat in protective coating systems.
• The coating has high anticorrosive performance under atmospheric exposure.
• Curing temperature may be as low as −5 °C (23 °F).
• Suitable for the fast-curing requirements of shop fabrication and assembly stage application.
• Easily applied by airless spray.
• Usable in all seasons.

Colour and gloss

• Reddish brown, grey and selected colours of the micaceous iron oxide series.
• Semi-gloss

Notes

• Epoxy coatings exposed to sunlight, heat or chemical contamination generally chalk and fade to varying degrees. Normal chalking and colour variation do not materially affect coating performance. Light-coloured coatings tend to darken over time. Since the product is not precisely tinted at the factory, slight colour differences in the coating appearance between batches are normal.
• When epoxy coatings are used in exposed conditions, consider applying a UV-resistant topcoat

Basic data 20 °C (68 °F)

Parameters after mixing

UK PG 6/23(92) Appendix 3: maximum 230.0 g/L (approx. 1.9 lb/US gal).

US EPA Method 24: 220.0 g/L (1.8 lb/gal).

Maximum time: extended accordingly.

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.

Substrate condition

• Bare steel: abrasive blast cleaning to Sa2½ of ISO 8501-1 or SP6 of SSPC, with a profile of 40–70 µm (1.6–2.8 mil); or power-tool cleaning at least to St3 of ISO 8501-1 or SP3 of SSPC.

Primed or previously coated steel surfaces

• The compatible previous coat must be clean, dry and free of all contaminants.
• Before recoating an existing coating, roughen the surface sufficiently if necessary.
• When used as a subsequent coat over inorganic zinc silicate primer, apply a thin mist coat of sealer first, then apply the full coat.

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.

• During application and curing, the substrate temperature must be at least 3 °C (5 °F) above the dew point.
• During application and curing, the substrate temperature may be as low as -5 °C (23 °F), provided the substrate is ice-free and dry.
• During application and curing, the relative humidity should not exceed 85%

Instructions for use

Mixing ratio by volume: base : curing agent = 3:1

• Before application, raise the temperature of the components or the mixed paint to above 15 °C (59 °F); otherwise, thinner may need to be added to adjust the paint viscosity to a suitable application state.
• 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.

Air spray

Airless spray (single-feed pump)

Brush/roller

Notes

• Roller application leaves roller marks and is suitable only where a low dry film thickness is required.
• Use a roller suitable for epoxy application.
• Because of the thixotropic nature of the coating, brush application may leave brush marks, so brush is generally limited to local small-area repair and touch-up of edges and corners.

Cleaning solvent

• THINNER 90-53

Supplementary parameters

Film thickness and theoretical spreading rate

Overcoating time for a 125 µm (5.0 mil) dry film thickness

Notes

• The practical maximum recoat interval is affected by local conditions
• To ensure optimum adhesion of the next coat, the surface shall be dry and free from any contamination (oil, grease, chalking and the like)
• If chalking or contamination occurs after 30 days or more of exposure, PREP 88 or an equivalent cleaner can be used for cleaning before applying the topcoat. Curing time for a coating with a dry film thickness of 125 µm (5.0 mil)

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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