SIGMAZINC 158 Two-component Moisture-curing Inorganic Silicate (Ethyl) Zinc-rich Primer

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Key properties

• Holds a friction coefficient 'B' class certificate to ASTM A-490.
• Complies with the Level 2 zinc dust pigment content requirements of SSPC Paint 20
• An anti-corrosive primer for steel structures.
• As a primer, suitable for use in coating systems with various types of non-saponifiable coatings.
• Provides sacrificial-anode electrochemical protection that suppresses corrosion of the substrate beneath the coating
• Under dry atmospheric exposure, the coating withstands substrate surface temperatures from -90 °C (-130 °F) to 500 °C (930 °F).
• With a suitable subsequent topcoat, the coating system can provide excellent corrosion protection in dry environments for steel structures at surface temperatures up to 540 °C (1000 °F).
• Good low-temperature curing performance.
• Good impact and abrasion resistance.
• Shall not be used in strongly alkaline (pH above 9) or strongly acidic (pH below 5.5) liquid media.

Colour and gloss

• Grey, grey-green.
• Flat.

Basic data 20 °C (68 °F)

Parameters after mixing

Max 507.0 g/L (approx. 4.2 lb/gal) (theoretical value).

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

Immersion environment

• Steel: abrasive blast clean to Sa 2½ (ISO 8501-1), with surface profile 40–70 µm (1.6–2.8 mils)
• Surfaces coated with a type-approved inorganic zinc silicate shop primer: sweep blast to grade Ss of the Japan Shipbuilding Research Association 'Surface Preparation Standard for Painting (SPSS)'; welds, rusted spots and damaged coating must be blast-cleaned to Sa 2½ of ISO 8501-1.

Atmospheric exposure environment

• Steel: abrasive blast clean to Sa 2½ (ISO 8501-1), with surface profile 40–70 µm (1.6–2.8 mils)
• Surfaces coated with a confirmed compatible inorganic zinc silicate shop primer: prepare to -Pt3 of the SPSS standard

Substrate temperature and application conditions

• 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, a substrate surface temperature up to 50 °C (122 °F) is acceptable
• During application and curing, the substrate temperature must be at least 3 °C (5 °F) above the dew point.
• During curing, the relative humidity shall be above 50%

Instructions for use

Mixing ratio by volume, base : hardener = 81:19 (4.26:1)

• Most 'PPG' inorganic zinc silicate coatings are supplied in two-component packaging. Typically, the liquid component of the film-forming base is packed in a plastic pail and the dry powder of the zinc dust pigment in a bag inside a steel drum.
• 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 2/3 of the liquid film-forming base into the empty steel drum after removing the zinc dust.
• [4] With more space in the liquid base pail, shake the remaining liquid at the bottom vigorously to bring it to a fully homogeneous state, so that no sediment remains at the bottom, then pour all the remaining film-forming liquid into the drum with the dry powder.
• [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 sieve.
• [8] Stir continuously at slow speed during application. The use of a dedicated inorganic zinc primer spray pump with a built-in agitator is recommended.

Notes

• At ambient temperatures above 30 °C (86 °F), add up to 10% by volume of Thinner 90-53.

Notes

• See supplementary parameters — pot life after mixing.

Air spray

Notes

• Use a spray pump for inorganic zinc silicate coatings with continuous agitation.

Airless spray (single-feed pump)

Notes

• Use a spray pump for inorganic zinc silicate coatings with continuous agitation.

Brush/roller

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

Notes

• Apply just enough to show 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 ensure the required dry film thickness is achieved.

Cleaning solvent

• THINNER 90-53

Rectification

• This method is for spray application only.
• If, for any reason, the film thickness is below the specified value and an extra coat of Inorganic Zinc Silicate Primer 158 must be applied, thin 25–50% with Thinner 90-53, apply over the surface and keep it wet for a period of time.

Supplementary parameters

Film thickness and theoretical spreading rate

Notes

• Maximum dry film thickness for brushing: 35 µm (1.4 mil)
• Cracking is likely when the dry film thickness exceeds 150 µm.
• On smooth, flat steel surfaces free of pitting, after blast cleaning, the average dry film thickness should be 75 µm (3.0 mils) and not less than 60 µm (2.4 mils).
• For rough or pitted steel, after blasting, ensure an average dry film thickness of 100 µm (4.0 mils) with a minimum of at least 75 µm (3.0 mils).

Notes

• 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.
• The unlimited maximum recoat interval applies only where the surface has absolutely never been contaminated.
• The subsequent topcoat shall be applied only after the primer coating is confirmed to be fully cured by the MEK rub test according to ASTM D4752. A test result of rating 4 or higher confirms sufficient cure and that overcoating may proceed.
• 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.
• When recoating with itself to achieve the specified dry film thickness, apply within 2 days, before the coating is fully cured. For recoating with itself, there is no minimum overcoating interval.
• Inorganic Zinc Silicate Primer 158 is a moisture-curing zinc silicate paint; during application and curing it must absorb sufficient moisture from the ambient atmosphere to react and cure. Therefore, monitor relative humidity and temperature throughout the curing period.
• When ambient conditions are unfavourable for normal curing or a shorter overcoating time is required, curing may be accelerated by the following methods after 4 hours from completion of application: [1] spray or pour clean water onto the surface and keep it wet for 2 hours, then allow it to dry; [2] spray or pour a 0.5% ammonia solution onto the surface, then allow it to dry.

TRANSLATION MISSING

Notes

• It is recommended to measure the relative humidity and temperature during curing.
• Inorganic Zinc Silicate Primer 158 is a moisture-curing zinc silicate paint; during application and curing it reacts and cures only after absorbing sufficient moisture from the ambient atmosphere.
• Adequate and continuous ventilation must be maintained during application and curing of the coating.
• During curing, the ambient relative humidity should be above 50%.

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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