GRAVICOL 2428-TC FIBER-BASED MASTIC

What is GRAVICOL 2428-TC Fiber-Based Mastic and why choose it

GRAVICOL 2428-TC Fiber-Based Mastic by Laminados y complementos is a semi-rigid polyester bonding paste reinforced with glass fibres, designed for structural bonding and high-thickness joints in composite parts. It offers very soft, workable consistency, easy application with spatula or comb, and excellent dimensional stability thanks to its low shrinkage and resistance to sagging in thick layers. Some properties described below come from general information on the GRAVICOL range and are not individually verified for this specific grade; always confirm with the official technical data sheet and safety data sheet of the manufacturer.

Main features

• Semi-rigid bonding paste especially suited for static joints and structural assemblies in composites.
• Reinforced with glass fibres, ideal for thick joints and gap filling where additional mechanical strength is required.
• Very soft consistency, easy to spread and level using a spatula or notched trowel, helping to speed up application on large surfaces.
• Low shrinkage during polymerisation, providing good dimensional stability of bonded parts and reducing the risk of deformation.
• No sagging in large thicknesses, allowing application in vertical or overhead areas with thick layers without slump. (Performance in extreme thicknesses should always be verified in tests on your specific process.)
• Pre-accelerated polyester bonding paste that only requires the addition of MEK peroxide catalyst for curing (information about pre-acceleration and curing behaviour is based on general GRAVICOL documentation and should be verified in the official technical data sheet).
• Designed for bonding GRP/composite laminates, inserts and core materials, and for cavity filling in composite construction (general application profile inferred from GRAVICOL bonding paste range, not specific to this code).

Technical specifications

• Product type: Polyester-based bonding paste reinforced with glass fibres for structural or semi-structural bonding.
• Consistency: Very soft paste for easy application with spatula or comb.
• Mechanical behaviour: Semi-rigid / semi-flexible bonding paste suitable for static joints (exact mechanical values not verified; consult official TDS for strength and modulus data).
• Shrinkage: Low shrinkage during curing, contributing to good dimensional stability of the bonded assembly.
• Sag resistance: Formulated to avoid sagging in thick applications.
• Reinforcement: Contains glass fibres to improve performance in thick joints and gap-filling applications.
• Chemical base: Polyester bonding paste, designed to be catalysed with MEK peroxide (MEKP).
• Colour (paste / cured): Dark blue paste that cures to a grey tone (information from GRAVICOL 2428TC description; always verify in the manufacturer’s current documentation for this exact grade).
• Mixing ratio (catalyst): Approx. 1% MEK peroxide by weight on the GRAVICOL 2428-TC base, unless otherwise specified in the latest technical/safety documentation.
• Catalyst: MEK peroxide (MEKP) type catalyst recommended by the supplier.
• Packaging: 25 kg container.
• Application areas (typical): Marine and general industrial composite applications where high-strength bonding and gap filling are needed (based on general GRAVICOL 2428TC and range information; suitability for a specific process or substrate must be validated by tests).

For exact curing times, gel time, working temperature range, density and mechanical properties, always refer to the official technical data sheet supplied by the manufacturer or distributor.

Applications and use cases

The following applications are typical for fiber-based bonding pastes of the GRAVICOL family and are indicative. They are not a substitute for process validation on each specific project.

• Structural bonding of GRP/composite parts: Bonding of moulded polyester or GRP components in boatbuilding, industrial covers, housings and panels where semi-rigid joints are required.
• High-thickness joints with gap filling: Use in joints with tolerances or gaps between parts, where the glass fibre reinforcement and paste consistency help bridge gaps and maintain mechanical integrity.
• Bonding of core materials: Fixing foam or other core materials between laminates in sandwich structures (decks, bulkheads, panels), always verifying adhesion and compatibility with the chosen core.
• Insertion of reinforcements and fittings: Embedding inserts, frames, ribs or other local reinforcements into composite structures, where the paste acts both as an adhesive and as a gap-filling material.
• Cavity filling and lamination aid: Filling local cavities, edges or transitions in laminates and assisting lamination to reduce air voids and irregularities.
• Marine sector: Typical for assembly of hull/deck joints, superstructures, interior modules and structural reinforcements in leisure boats and industrial marine components, provided that processing parameters are adjusted to the specific project.
• Industrial composites: Bonding and assembly of composite parts in transport, industrial equipment, wind energy or general composite fabrication, where controlled shrinkage and reliable bonding are needed.

Before implementing GRAVICOL 2428-TC in production, it is essential to perform preliminary tests under your real process conditions (substrates, surface preparation, temperature, thickness and curing schedule) and to follow the recommendations of the official technical and safety data sheets.

FAQ

1. What type of product is GRAVICOL 2428-TC Fiber-Based Mastic?

   It is a polyester-based, semi-rigid bonding paste reinforced with glass fibres, designed for structural or semi-structural bonding and gap filling in composite parts. This definition is based on available commercial descriptions; always check the official technical data sheet for the most accurate classification.

2. How is GRAVICOL 2428-TC mixed and catalysed?

   Commercial information indicates a typical mixing ratio of about 1% MEK peroxide (MEKP) by weight on the GRAVICOL 2428-TC base. The exact percentage, mixing procedure and working time must be confirmed in the current technical and safety data sheets, as they can vary with temperature and application conditions.

3. On which substrates can it be used?

   GRAVICOL bonding pastes are generally intended for bonding glass-fibre reinforced polyester or similar composite substrates and, in some cases, core materials or inserts. Use on metals, wood or other substrates must be validated through adhesion tests and verified against the official technical data sheet; this information is not fully verified for the 2428-TC grade.

4. Can I apply thick layers without sagging?

   The product is described as a fiber-based bonding paste for high-thickness joints, with no sagging in large thicknesses. However, the maximum recommended layer thickness and application in vertical or overhead positions should always follow the manufacturer’s recommendations and be tested in your specific process.

5. What is the colour of the product?

   For the 2428TC code, manufacturer information indicates a dark blue paste that cures to a grey colour. As formulations can change, verify colour and appearance in the latest official documentation or directly on the supplied batch.

6. What catalyst should be used?

   The product is intended to be used with MEK peroxide (MEKP) type catalyst. Only use the catalyst type and amount recommended by the manufacturer and as indicated in the safety and technical data sheets.

7. Is this product suitable for marine applications?

   Yes, GRAVICOL bonding pastes, including 2428-TC, are commonly referenced for marine and industrial composite applications. Nevertheless, suitability for a specific marine structure (for example, a hull/deck joint or structural bulkhead) must be validated by engineering design, testing and the recommendations contained in the official technical documentation.

8. Where can I find verified technical and safety information?

   The definitive reference is always the official technical data sheet (TDS) and safety data sheet (SDS) issued by the manufacturer or authorised distributor. This description is informative and partly based on general GRAVICOL range data, so it should not replace consultation of those official documents.

*Contenido generado por IA