Silicone Heat-resistant Zinc-rich Primer XH7627L

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Product Description

The product consists of high-silicone-content silicone resin, heat-resistant pigments (fillers), zinc dust, additives, solvents and accelerator. Long-term heat resistance temperature 400°C; when a thin coating is used in combination with silicone aluminium powder paint, the maximum heat resistance temperature is 540°C. Suitable for temperature-resistant anticorrosion protection of high-temperature pipelines, equipment and exhaust devices in petrochemical plants, chemical plants, power plants, steel plants and other facilities, with cathodic protection; particularly suitable for maintenance of high-temperature pipelines and equipment that cannot be thoroughly abrasive blast cleaned.

Product Characteristics

• Long-term thermal stability at high temperatures
• Good anti-corrosion performance
• Fast-drying performance
• Good compatibility with other heat-resistant topcoats

Basic physical and chemical data

Application parameters

Application Methods

*For long-term heat resistance above 400 °C, strictly control the film thickness during application.

Theoretical Spreading Rate

Application data (typical dry film thickness 40 µm)

*The maximum recoat interval depends on the exposure environment and the end use of the coating.

Surface Preparation

All surfaces to be coated shall be clean, dry and free from contamination. Before application, all surfaces shall be assessed and prepared in accordance with ISO 8504:2000. The product is suitable for application over metal substrates prepared to Sa2½ or St3. When applied over inorganic zinc silicate primers or old coats of this product, chalk, grease and other contaminants shall be removed by appropriate methods. In cracked or damaged areas, the substrate shall be prepared to Sa2½ or St3 before applying the product.

Precautions

1. Maintain ventilation and exhaust during application, keep away from ignition sources, and wear masks, gloves and other protective equipment; maintain adequate ventilation during curing. 2. When mixing, first stir the Base uniformly; add the zinc dust component and accelerator slowly under stirring in accordance with the ratio, and stir thoroughly. Then adjust the thinner amount according to application requirements and temperature changes, and mix thoroughly. Filter the mixed paint through a filter mesh before use; stir periodically during application to prevent zinc dust settling. Because the product ratio is large, when mixing a small amount, use weighing equipment; a volume scale cannot accurately prepare paint by volume. 3. Before heat exposure and secondary curing, the coating cannot achieve ideal physical and mechanical properties; handle with particular care during transport to avoid coating damage. Under long-term high temperature, the film may show slight discolouration and yellowing. 4. Overcoating or too short a recoat interval seriously affects drying and curing, heat resistance, recoating performance and handling time. At a design maximum temperature of 400°C, the maximum film thickness is 90 µm; at temperatures above 420°C, the maximum film thickness is 60 µm, and the product must be used with other suitable heat-resistant topcoats. A typical system is combination with silicone aluminium powder paint; in this case, the coating thickness of this product is controlled at 40–60 µm, the silicone aluminium powder topcoat at 30–50 µm, the total film thickness not exceeding 90 µm, and the maximum heat resistance temperature is 540°C. 5. After long-term exposure of this product coating, ensure the old film surface is free from contaminants before recoating, and sand the surface before applying subsequent coatings. 6. Thick films of this product must be thoroughly dried and cured for at least 7 days before service; otherwise, a coating that is not fully cured cannot achieve good heat resistance and may peel or detach during heating. 7. During application and curing, the substrate temperature must be above 5°C and at least 3°C above the dew point; relative humidity shall not exceed 85%. Avoid application on surfaces above 40°C; otherwise, defects such as blistering and poor levelling may occur. 8. Cutting structures coated with this paint generates fume and dust; provide appropriate protection. 9. When work is paused, do not leave paint in paint hoses, spray guns or spraying equipment. Flush all equipment thoroughly with thinner. If the pause is too long, mix a new unit of paint for application. 10. Clean all equipment with thinner immediately after use. Flushing spraying equipment at regular intervals during daily work is good practice. Cleaning frequency depends on spraying volume, temperature, spraying time, including interruption time. 11. Dispose of remaining paint and empty cans in accordance with relevant local regulations.

Packaging

Storage

Store sealed in a ventilated, cool and dry place, away from ignition sources. Base: minimum 12 months; zinc dust and accelerator: 6 months.

Safety Precautions

1. For the paint and recommended thinner, refer to the safety sheet and safety data for related materials. This is a solvent-borne paint; inhalation of paint mist and solvent must be avoided, skin and eye exposure should be minimised, and contact with wet paint avoided. 2. All work related to application and use of this product must be carried out in accordance with relevant national health, safety and environmental standards and regulations. 3. Welding or flame cutting on metal coated with this product generates dust and fume; therefore,

Use suitable personal protective equipment and adequate local ventilation. 4. If there are doubts about the suitability of this product, consult the company.

Scope of liability

The information provided in this product data sheet is based on laboratory test results that we consider accurate, and is provided for application guidance only. All recommendations and advice given by T&H on the use of T&H products, whether in technical documents, special consultation or otherwise, are based on information we consider most reliable. Our products and the information provided are intended for users with the necessary knowledge and industrial experience, and it is for these end users to determine whether the products are suitable for their use. T&H cannot control the quality and condition of the substrate, nor the various factors affecting the use of the product. Therefore, T&H accepts no liability for any loss, injury or damage arising from the use of our products or from reliance on this product data sheet (unless otherwise agreed in writing). Data in this product data sheet may be revised as necessary based on practical experience and continued product development.

Information is subject to the manufacturer's latest version; the manufacturer's latest TDS prevails.
The technical parameters on this page are taken from the product's original manufacturer technical datasheet, the copyright of which belongs to the manufacturer. If a rights holder considers the presentation inappropriate, contact us for verification and handling.