DIMETCOTE 9-75 inorganic zinc silicate primer 9-75

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Introduction

A two-component, moisture-curing, ethyl silicate zinc-rich coating.

Key properties

• An anti-corrosive primer for steel structures.
• Specially for structural connection areas required to meet national standard GB 50205 acceptance specification.
• For use in normal atmospheric exposure, with a service temperature range from -90 °C (-130 °F) to 400 °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

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

Maximum time: unlimited.

Powder component: at least 24 months, but it shall be stored in a dry environment and kept free from moisture.

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

Atmospheric exposure environment

• Bare steel; blast cleaning to Sa2½ of ISO 8501-1, or at least SP6 of SSPC, with a blasted surface profile of 40

–70 µm (1.6–2.8 mil).

Substrate temperature and application conditions

• During application and curing, an ambient temperature as low as -18 °C (0 °F) is acceptable, provided the substrate surface is dry and free of ice.
• During application, a substrate surface temperature up to 55 °C (131 °F) is acceptable.
• During application and curing, the substrate temperature must be at least 3 °C (5 °F) above the dew point.
• During curing, ensure the ambient relative humidity is above 50%.

Instructions for use

• 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.
• To prevent lumping, never pour the liquid film-forming base into the drum containing the dry zinc dust pigment.
• [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.

Air spray

Airless spray (single-feed pump)

Brush/roller

• For local repair and manual touch-up only.
• Roller application is not recommended.

Note: apply just enough to leave a clearly visible wet film, ensuring a maximum dry film thickness of 25 µm (1.0 mil). This method also applies to subsequent coats to achieve the required dry film thickness.

Supplementary parameters

Film thickness and spreading rate

Notes

• Maximum dry film thickness for brush application: 35 µm (1.4 mils).
• At dry film thickness above 150 µm, the coating is prone to cracking.
• Inorganic zinc silicate primers with high zinc dust content develop dense voids within the dry film.

Recoat interval for a coating at 100 µm (4.0 mils) dry film thickness

Notes

• For recoating with itself to build up thickness, apply within 2 days to ensure completion before the coating is fully cured. However, if recoating with itself as a subsequent coat,

provided the surface is clean and dry and free of any contaminants including zinc salts, there is no maximum overcoating interval. When overcoating, thin with Thinner 90-53 at 25–50% by volume.

• Per ASTM D4752, verify the primer is fully cured by methyl ethyl ketone (MEK) rub before applying the topcoat. When the test result is rating 4 or higher,

the coating is confirmed sufficiently cured, and the subsequent coat may be applied.

• To determine whether the film is fully cured, use the MEK rub test according to ASTM D4752: wet a dry cloth with MEK or Thinner 90-53 and rub back and forth 50 times

; if no sign of dissolution of the coating is visible, the coating can be judged to have reached full cure.

• Coating curing/recoat intervals shorten as ambient relative humidity rises; for varying site conditions, consult the PPG technical service representative on site.
• To avoid pinholes in directly applied subsequent coats, use a thin mist coat followed by a regular full coat. Remove dry spray before recoating.
• Inorganic zinc silicate DIMETCOTE 9 is a moisture-curing ethyl silicate zinc-rich primer; this means that during application and subsequent drying/curing, it must absorb from the surroun

ding atmosphere enough moisture to cure. Therefore, monitor ambient temperature and relative humidity during the curing period.

• When ambient conditions are unfavourable for normal curing or a shorter overcoating time is required, curing can be accelerated from 4 hours after application by the following methods:

[1] Spray or pour clean water over the surface and keep it wet for 2 hours, then allow it to dry;

[2] Spray or pour a 0.5% ammonia solution over the surface, then allow it to dry.

• The unlimited maximum recoat interval applies only where the surface has absolutely never been contaminated.

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

Notes

• Inorganic zinc silicate DIMETCOTE 9 is a moisture-curing ethyl silicate zinc-rich primer; this means that during application and subsequent drying/curing, it must

absorb enough moisture from the ambient atmosphere to cure.

• It is recommended to measure the relative humidity and temperature during curing.
• During curing, the ambient relative humidity should be above 50%.
• Adequate and continuous ventilation must be maintained during application and curing of the coating.

Pot life after mixing (at suitable application viscosity)

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.
• For safe working in confined spaces, refer to Information Sheet 1433.
• For ventilation guidance, refer to Information Sheet 1434.
• For steel surface preparation, refer to Information Sheet 1490.
• For mineral abrasive specifications, refer to Information Sheet 1491.
• For relative humidity, substrate temperature and air temperature, refer to Information Sheet 1650.

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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