Acrylic Polysiloxane Topcoat XH6416

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Product Description

A high-solids two-component acrylic polysiloxane coating, isocyanate-free, for use as a high-weather-resistance topcoat in severely corrosive atmospheric environments.

Product Characteristics

• Excellent gloss and colour retention
• Excellent weathering resistance and anticorrosive performance
• High solids content, low VOC, compliant with environmental regulations.

Basic physical and chemical data

Application parameters

Application Methods

*Select a suitable thinner according to the season and temperature

Theoretical Spreading Rate

Application data (typical dry film thickness 60 µm, RH=65%):

* When the maximum recoating interval is exceeded, the intercoat adhesion of the film will decrease. * When applied over an epoxy primer or intermediate coat, the surface condition must be confirmed before applying the polysiloxane topcoat

For application, the recommended minimum recoating interval at 25 °C should be more than 24 h, and the maximum recoating interval should be no more than 7 days, to ensure reliable adhesion.

Surface Preparation

All surfaces to be coated must be clean, dry and free from contamination. Before coating, all surfaces must be assessed and treated in accordance with ISO 8504:2000. The product must be applied over the recommended anticorrosive primer or intermediate coat, and application must be carried out within the specified recoating interval; the primer or intermediate coat surface must be dry and free from any contamination. If the recoating interval is exceeded, lightly abrade the previous coat before overcoating. When applying over other old coatings, remove chalked film, grease and other contaminants from the surface by a suitable method. In cracked or damaged areas, the substrate must be prepared to Sa 2½ or St 3, and the primer repaired before applying the product.

Precautions

1. During application, ensure ventilation and exhaust, keep away from sources of ignition, and wear protective equipment such as masks and gloves; adequate ventilation should also be maintained during curing. 2. When mixing, stir the base thoroughly first, then add the curing agent in the specified ratio and mix thoroughly; adjust the amount of thinner according to application needs and temperature changes, and stir thoroughly and induce. 3. Once opened, the coating is affected by moisture and its storage life is shortened; use it as soon as possible to avoid waste. 4. Over-thinning reduces sag resistance and slows curing; use the dedicated thinner. Thinners containing alcohols and ketones will seriously affect the drying speed of the coating. 5. Over-application seriously affects drying, curing, recoating performance and handling time. When the dry film thickness exceeds 60 µm, complete internal curing of the film requires a longer time; particular attention should be paid to controlling the coating thickness when using the product. Only a fully cured coating provides good adhesion and weather resistance. 6. After long-term exposure of the coating (more than 10 days), the intercoat adhesion will be significantly affected when recoating; before recoating, ensure that the old film surface is free from contamination and abrade the surface before overcoating. XH6416 is normally applied over the specified epoxy intermediate coat and epoxy primer; not all epoxy coatings are suitable for overcoating with the product. In particular, when using intermediate coats or primers with certain fast-curing agents, XH6416 will not achieve good adhesion; in this case, the coating must be carefully and lightly abraded before overcoating. 7. Brush or roller application cannot achieve high film thickness and a good continuous film in a single pass; multiple coats are required, but the recoating interval must not exceed the specified maximum recoating interval. 8. When the product made with relatively bright chrome-free red or yellow pigments is applied over a dark primer, multiple coats are required to achieve good hiding power; therefore, a light-coloured primer or intermediate coat is recommended for these colours. 9. During application and curing, the substrate temperature must be above 5 °C and at least 3 °C above the dew point; a relative humidity of 50~80% gives a better film appearance. The curing speed of the film increases with increasing humidity; if the humidity is too high, the gloss of the film will decrease and appearance defects may even occur; if the humidity is too low, the coating will take a long time to fully cure. Special note: when applying the matching intermediate coat, the relative humidity should not exceed 85%; if the humidity is too high, amine carbonates will form on the surface of the intermediate coat, which will seriously affect the adhesion of XH6416. If this occurs, lightly abrade and sweep the intermediate coat surface before applying the topcoat. 10. The product is not suitable for underwater use. 11. Cutting structures coated with this product produces smoke and dust; take appropriate protection. 12. When work is interrupted, do not leave the coating in hoses, spray guns or spray equipment. Flush all equipment thoroughly with thinner. If the interruption is too long, mix a fresh batch of paint for application. 13. All equipment should be cleaned with thinner immediately after use. Periodic flushing of spray equipment during the working day is good practice. The cleaning frequency depends on spray volume, temperature, spray time and factors including interruptions.

14. Surplus paint and empty containers must be disposed of in accordance with the relevant regional regulations.

Packaging

Storage

Keep sealed and store in a ventilated, cool, dry place away from sources of ignition; base 6 months, curing agent 6 months.

Safety Precautions

1. For the coating and its recommended thinners, see the safety sheets and the safety data of the relevant materials. This is a solvent-borne coating; avoid inhaling spray mist and solvent vapours, and avoid exposing skin and eyes and contact with uncured paint as far as possible. 2. All work related to the application and use of this product must comply with the relevant national health, safety and environmental standards and regulations. 3. If welding or flame cutting is required on metal coated with this product, dust and fumes will be generated; use appropriate personal protective equipment and adequate local ventilation. 4. If in doubt 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.