Epoxy Mastic XH4068

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Product Description

A polyamide-cured, high-solids, high-build epoxy with a tough film, good substrate wetting and low-temperature curing. Under severe atmospheric corrosion, it may be used as a primer or intermediate coat in new construction or maintenance, and also as a topcoat not exposed to weathering.

Product Characteristics

• Good sag resistance, allowing a high dry film thickness in one coat
• May be used as a primer in surface-tolerant coating systems
• Fast drying
• High volume solids, compliant with environmental requirements

Basic physical and chemical data

Application parameters

Application Methods

*In high-temperature seasons, the slow-drying thinner XH9400S is recommended.

Theoretical Spreading Rate

Application data (typical dry film thickness 200 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. When used as a primer, the substrate shall be blast-cleaned to Sa2½ with a surface profile of 40–75 µm. Before derusting, remove all oil, grease and weld spatter, and grind welds and sharp edges. Where the coating film has suffered mechanical damage with localised rusting, spot blast to Sa2½ or power-tool clean to St3 before local repair. When applied over existing coatings, chalk, zinc salts, grease and other contaminants shall be removed by appropriate methods. When applied over inorganic zinc silicate primers or metal spray, an approved tie-coat or intermediate coat shall be used.

Precautions

1. During application, ensure good ventilation and exhaust, keep away from ignition sources, and wear a mask, gloves and other protective equipment; adequate ventilation shall also be maintained during curing. 2. When mixing, first stir the base thoroughly, then add the curing agent in the specified ratio and mix uniformly; adjust the thinner amount according to application requirements and temperature changes, and mix and induce thoroughly. 3. When applied over inorganic zinc silicate coatings, a tie-coat shall be used for sealing; the product shall be applied only after the tie-coat is hard dry, otherwise the effectiveness of sealing pinholes will be reduced. 4. Excessive thinning will reduce sag resistance and slow curing. 5. Over-thick application will seriously affect drying, curing, overcoating performance and handling time. For better coating performance, when the film thickness exceeds 200 µm, apply in multiple coats to improve film density. Avoid over-thick application in a single pass on edges, corners, welds and similar areas; where these areas have been over-applied, the overcoating interval of subsequent coats shall be extended to allow solvent release, otherwise the coating may crack in service. 6. If the coating chalks after long-term exposure, wash with high-pressure water or abrade the surface before applying the next coat. 7. With roller application, high film thickness and a good continuous film cannot be obtained in a single pass; multiple coats are required. 8. During application and curing, the substrate temperature shall be above 5 °C and at least 3 °C above the dew point, and the relative humidity shall not exceed 85%. 9. In steel fabrication shops requiring fast overcoating, a fast-drying curing agent may be used when the temperature is below 20 °C. In other anticorrosive maintenance work, a fast-drying curing agent may be used when the air temperature is below 15 °C. Above 20 °C, the fast-drying curing agent is not recommended, as the pot life shortens. If it is still to be used after the temperature rises, account for the shortened pot life, or change to a general-purpose curing agent. 10. Cutting structures coated with this coating produces fumes; appropriate protection shall be taken. 11. When work is interrupted, do not leave paint in hoses, spray guns or spray equipment. Flush all equipment thoroughly with thinner. If work is interrupted for too long, remix a fresh batch of paint before resuming. 12. All equipment shall be cleaned with thinner immediately after use. Periodically flushing spray equipment during the daily work is good practice. The frequency of cleaning depends on the quantity sprayed, temperature, spraying time and interruptions. 13. Remaining paint and empty cans shall be disposed of in accordance with relevant local regulations.

Packaging

Storage

Store sealed in a ventilated, cool, dry place away from ignition sources; ideal storage temperature 5–35 °C. Minimum 12 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.