SIGMA ETCH Phosphating Etch Solution

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Introduction

An etching solution formulated with phosphoric acid, used for surface treatment of newly fabricated galvanised parts before painting.

Key properties

• Used as a special surface treatment process for newly fabricated galvanised surfaces that cannot be blast cleaned or abraded, before painting.
• A wide range of protective coating systems can subsequently be applied.
• It can be used to improve the intercoat adhesion of heat-resistant coatings on newly fabricated galvanised surfaces.
• After application, when the colour of the etching solution changes from blue to black, it indicates that a phosphate film has formed and the expected surface treatment effect has been achieved.
• Complies with the British Railways 'T-wash' specification requirements.
• Not recommended for immersed environments.

Colour and gloss

• When the etching solution is applied to a clean galvanised surface, it changes from the initial light blue to grey-black.

Basic data at 20 °C (68 °F)

Product parameters

Maximum time: 48 h.

Recommended substrate condition and temperature

Galvanised surfaces

• Galvanised surface conditions vary; the preferred treatment is a light sweep blast after removing oil/grease and cleaning the surface.
• Remove all rust, dust, moisture, oil, grease and other contaminants from the surface.
• Any soluble zinc salt residue should be removed by abrading and washing.
• Wash with clean fresh water to remove residual emulsion, dirt and other contaminants.
• If uneven blackening or mottling occurs after applying the etching solution, it indicates that the phosphating treatment has not been effective and must be repeated.

Instructions for use

• Mix thoroughly before application.
• Over-application of the phosphating etching solution will also coarsen the phosphate film, promoting the formation of dense black particles; in this case, it is not suitable to apply the subsequent coat directly.
• For such areas, remove these particulate surface deposits by abrading or washing, otherwise the adhesion of the subsequent coat will be affected.

Brush/roller

• Brush application is recommended, at a spreading rate of 15 m²/L; roller application may also be used.

Supplementary parameters

Recoating interval

Safety Precautions

• The product contains phosphoric acid
• Refer to the material safety data sheet (MSDS) before using the product
• Refer to INFORMATION SHEETS 1430, 1431
• Although this is a water-borne coating, avoid inhaling spray mist and its vapours, and avoid skin and eye contact with the paint as far as possible.

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 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, see Information Sheet 1431.
• For safe working in confined spaces, refer to Information Sheet 1433.
• For ventilation guidance, refer to Information Sheet 1434.

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.

The PPG logo, and all other PPG marks are property of the PPG group of companies. All other third-party marks are property of their respective owners.