DIMETCOTE 3W waterborne inorganic zinc silicate coating 3W

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Introduction

Water-borne inorganic zinc silicate primer.

Key properties

• VOC-free formulation.
• Zinc dust content in the dry film exceeds 80% by weight.
• Excellent anti-corrosion properties.
• Excellent cracking resistance.
• The coating withstands dry heat up to 399 °C (750 °F).
• Shall not be used in strongly alkaline (pH above 9) or strongly acidic (pH below 5.5) liquid media.

Colour and gloss

• Grey.
• Flat.

Basic data at 20 °C (68 °F)

Parameters after mixing

Powder: store for at least 24 months 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.
• The applied dry film thickness may be up to 150 µm (6.0 mils); isolated individual spots of small scattered areas are permitted up to a maximum of 225 µm (9.0 mils). When used as a heat-resistant coating,

the maximum dry film thickness is permitted to be only 75 µm (3.0 mils).

Recommended substrate condition and temperature

Atmospheric exposure environment

• Bare steel: blast cleaning to Sa2½ of ISO 8501-1, with a surface profile of 40–70 µm (1.6–2.8 mil).
• Steel plate with a confirmed compatible ethyl silicate zinc dust shop primer: abrade and clean to standard SPSS-Pt3.
• Surface of old galvanized parts: blast clean to remove corrosion and roughen the surface; in addition, if zinc salts are present on the surface, they must also be completely removed.

Substrate temperature and application conditions

• During application, ensure the surface temperature is between 4 °F (40 °C) and 54 °F (130 °C).
• During application, the substrate surface temperature must be maintained at least 3 °C (5 °F) above the dew point.

Coating system specification

Instructions for use

• Mixing ratio by volume: liquid : powder = 67.3 : 32.7.
• Most PPG inorganic zinc silicate coatings are supplied in two-component packaging. Typically, the plastic drum holds the liquid film-forming base, and the steel drum holds a bag of

the bagged dry zinc dust pigment.

• To ensure correct mixing, follow the preparation steps below.
• [1] Remove the zinc dust bag from the steel drum.
• [2] Shake the plastic drum containing the liquid film-forming component for several minutes to homogenise the liquid to a certain degree.
• [3] Pour two-thirds of the liquid film-forming base into the steel drum emptied of the zinc dust.
• [4] With the larger space now in the base drum, shake the remaining liquid at the bottom vigorously to a fully homogeneous state, leaving no sediment at the bottom of the drum.

material, then pour all the remaining film-forming liquid into the dry powder drum.

• [5] Then slowly pour the dry zinc dust into the liquid film-forming component in the steel drum, while stirring slowly and continuously with a power mixer.
• [6] After all the zinc dust has been added to the liquid, stir at high speed until fully homogeneous.
• [7] Strain through a 30–60 mesh screen.
• [8] Stir slowly and continuously during application. Use a dedicated inorganic zinc primer spray pump with built-in agitation.

Induction Time

Not required.

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.
• If the wet film after application is cured in stagnant, non-circulating air, the film surface is usually too smooth and glossy; appropriate surface abrading

and roughening shall be carried out before applying the subsequent coat.

• Mist coat: before applying subsequent coats of the system, the application technique of first mist coating to seal / then full coating shall be adopted to prevent blistering of the subsequent coat. In addition, note

that before application, gently wipe off the dry paint mist deposited on the surface of the zinc dust primer!

• Repair: after the coating is hard dry, measure the dry film thickness. When the measured dry film thickness is generally below the specified value, if possible, touch-up application shall be carried out as soon as possible, and the time

should not exceed 24 h after completion of the previous coat. In addition, ensure that dry paint mist is completely removed from the surface of the zinc dust primer!

Air spray

Airless spray (single-feed pump)

Brush/roller

• For local small-area repair and touch-up only.

Supplementary parameters

Film thickness and spreading rate

Notes

• At dry film thickness above 150 µm, the coating is prone to cracking.
• Maximum dry film thickness for brush application: 35 µm (1.4 mils).

Overcoating interval schedule for dry film thickness up to 125 µm (5.0 mil)

Notes

The surface must be clean and dry. Before overcoating, surface contaminants including zinc salts and alkaline soluble salts must be removed by high-pressure water or vigorous scrubbing. Note: after application of this product, alkaline soluble salts generated during film curing must be washed off before the steel plate is moved to outdoor storage. Where, under the actual future service environment, water may accumulate on the surface of the coating system or condensation may readily occur at high humidity, it is strongly recommended that the surface be rinsed and cleaned before applying the subsequent coat. In addition, several representative locations shall be selected for testing to confirm that the surface pH has been reduced to 8 or below after rinsing to be acceptable.

Curing schedule for dry film thickness up to 125 µm (5.0 mil)

Pot life (at normal application viscosity)

Product certifications

• The 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.
• For safety and health in confined spaces and 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.

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