SIGMAGUARD 750 Inorganic Zinc Silicate Coating 750

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Introduction

A two-component moisture-curing ethyl silicate zinc-rich primer.

Key properties

• As a special tank and compartment coating, it has excellent resistance to solvents and chemicals.
• Used as a tank and compartment coating or as a primer in various non-saponifiable coating systems.
• For use in normal atmospheric exposure, with a service temperature range from -90 °C (-130 °F) to 400 °C (750 °F).
• The coating has a high zinc content, providing excellent corrosion protection performance.
• Good impact and abrasion resistance.
• Holds a friction coefficient class "B" certificate in accordance with ASTM A-490.
• A widely recognised corrosion protection coating (Lloyd's Register certified).
• The coating must never be placed in liquids with an alkalinity above pH 9 or acidity below pH 5.5.
• Meets the zinc dust content level 2 of SSPC Paint 20 and the zinc dust content requirements of ISO 12944-5.

Colour and gloss

• Grey.
• Flat.

Basic data at 20 °C (68 °F)

Parameters after mixing

UK PG 6/23(92) Appendix 3: maximum 452.0 g/L (approx. 3.8 lb/US gal).

China national standard GB 30981-2020 (tested value): 414.0 g/L (approx. 3.5 lb/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

Substrate condition

• Bare steel: abrasive blast clean to Sa 2½ (ISO 8501-1), with surface roughness of 40–70 µm (1.6–2.8 mils).
• Steel with severe pitting is not acceptable.

Substrate temperature and application conditions

• Application on non-high-temperature substrate surfaces: from -5 °C (23 °F) to 40 °C (104 °F).
• During application, the substrate surface temperature must be maintained at least 3 °C (5 °F) above the dew point.
• During curing, ensure the ambient relative humidity is above 50%.

Coating system specification

The appropriate coating system is recommended based on the performance in the latest chemical resistance list.

• Inorganic zinc silicate SIGMAGUARD 750: 1 x 75-100 µm (3.0-4.0 mil).

Instructions for use

Mixing volume ratio base : zinc powder = 74:26

• 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.

Rectification

• When, for some reason, the local dry film thickness is below the specified requirement and inorganic zinc silicate 750 must be applied for repair, it is usually necessary to use Thinner 90-53 at 25% to 50%

by volume to thin inorganic zinc silicate 750, so that the applied repair coat's wet film readily wets the surface, and the wet film state can be seen relatively clearly for the initial period.

• This method is for spraying only.

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.

Recoat interval for a coating up to 75 µm (3.0 mils) dry film thickness

Notes

• At relative humidity below 50%, longer recoating intervals are required.
• For coating systems with subsequent coats, to avoid blistering problems (such as pinholes) in the subsequent coat, the inorganic zinc silicate 750 coating must be sealed with an approved coating.
• Inorganic zinc silicate 750 is a moisture-curing zinc silicate, which means that during application and subsequent drying and curing, sufficient moisture must be absorbed (from the atmosphere

or by immersion in water) before curing; therefore, it is recommended to measure and monitor the ambient relative humidity and temperature frequently during coating curing.

• Before putting into service or recoating with subsequent coats, the inorganic zinc silicate primer coating should be fully cured.
• When curing conditions are unfavourable or a shortened recoating time is required, 4 h after application, the following operations can accelerate curing:
• [Option 1] Increase the ambient humidity or spray water mist, and keep the surface wet for 2 h, then allow natural drying under normal conditions.
• [Option 2] Prepare a 0.5% ammonia solution to wet the surface or spray an ammonia water mist, then allow natural drying under normal conditions.
• Before recoating with the subsequent coat, check and confirm that the inorganic zinc silicate 750 coating is fully cured and dry.
• 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.

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

Notes

• Inorganic zinc silicate 750 is a moisture-curing ethyl silicate zinc powder paint, which means that during application or after coating completion, the coating will only cure after fully absorbing moisture (from the atmosphere or by immersion

in water).

• 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

• Refer to the Material Safety Data Sheet (MSDS) and product package labelling for full details of the stated safety precautions and protective measures.
• 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 product data, refer to Information Sheet 1411.

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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