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    5-litre container of Kaowool ceramic fibre hardener used for increasing surface strength and durability of ceramic fibre insulation products in high-temperature applications
    CERAMIC FIBRE SPECIALTY PRODUCTS

    Ceramic Fibre Hardener / Ceramic Refractory Rigidiser
    Inorganic Liquid Rigidiser for Strengthening Ceramic Fibre Insulation – Available in 1 L & 5 L Options

    Ceramic Fibre Hardener, also known as Ceramic Fibre Rigidiser or Kaowool Rigidiser, is an inorganic liquid used to strengthen the surface of ceramic fibre insulation. It penetrates the fibre surface to reduce dusting, improve abrasion resistance and increase durability while maintaining the insulation's high-temperature performance.

    Suitable for ceramic fibre blankets, boards, modules and papers, it is widely used in furnaces, kilns, burner surrounds, heat treatment equipment and other industrial applications where exposed ceramic fibre requires additional surface protection.

    Key Benefits

    • Improves surface strength for exposed ceramic fibre insulation.
    • Reduces dusting by binding loose surface fibres.
    • Increases abrasion resistance in areas exposed to maintenance, contact or airflow.
    • Flexible application by brush, spray or dip.
    • Water dilutable for easier application where required.
    • Available in 1 L and 5 L containers.

    When Should You Use Ceramic Fibre Hardener?

    Ceramic Fibre Hardener is recommended whenever ceramic fibre insulation needs improved surface strength, reduced dusting or greater resistance to everyday wear. Typical applications include:

    • Exposed ceramic fibre surfaces subject to airflow or regular contact.
    • Furnace doors, kiln linings and burner surrounds.
    • Areas that may be brushed, bumped or disturbed during maintenance.
    • Existing ceramic fibre installations requiring improved surface durability and longer service life.

    Compatible With

    Ceramic Fibre Hardener is suitable for use with ceramic fibre blankets, ceramic fibre boards, ceramic fibre modules and ceramic fibre paper to improve surface strength and reduce dusting.

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    Practical Application Guide Below

    Continue below for our Ceramic Fibre Hardener application guide, including application methods, workshop tips, coverage rates, drying recommendations, storage advice, FAQs and related ceramic fibre products.

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    Storage & Handling ▾

    Proper storage helps maintain product performance and extends shelf life. Follow these recommendations when storing Ceramic Fibre Hardener.

    Store Between 2°C & 43°C

    Store above 2°C and avoid temperatures above 43°C. Extreme temperatures may affect product performance.

    Protect From Freezing

    Do not allow the product to freeze. Freezing may permanently affect its properties and performance.

    Keep Container Sealed

    Keep the container tightly sealed when not in use and store in a cool, dry, well-ventilated area to help prevent contamination and evaporation.

    Storage Advice

    Following these storage recommendations will help maximise product life and ensure the rigidiser performs as intended when you're ready to use it.

    Frequently Asked Questions ▾

    Can Ceramic Fibre Hardener be used on ceramic fibre blanket?

    Yes. It is commonly applied to ceramic fibre blanket after installation to reduce surface dusting and improve resistance to abrasion and airflow.

    Can it be used on ceramic fibre board?

    Yes. Ceramic Fibre Hardener is suitable for ceramic fibre boards and can improve surface durability while reducing loose surface fibres.

    Can Ceramic Fibre Hardener be diluted?

    Yes. The product may be diluted with up to an equal volume of water where a lower viscosity or easier application is required.

    Can it be brushed, sprayed or dipped?

    Yes. The rigidiser can be applied by brush, spray or dip depending on the size of the job and the level of penetration required.

    Will it make the ceramic fibre rigid?

    It hardens the surface of the ceramic fibre, improving its resistance to dusting and abrasion. It is designed to strengthen the exposed surface rather than completely transform the insulation into a rigid material.

    Does Ceramic Fibre Hardener affect insulation performance?

    When applied correctly, it is intended to strengthen the surface while maintaining the high-temperature insulating properties of the ceramic fibre.

    How long should I allow it to dry?

    Allow at least 24 hours for air drying before returning the insulation to service. Drying time may vary depending on coating thickness and environmental conditions.

    How do I know how much Ceramic Fibre Hardener I need?

    The required quantity depends on the ceramic fibre thickness, density and whether you're applying a light surface coating or full saturation. If you're unsure, contact our team and we'll help estimate the amount required for your application.

    Practical Workshop Guide

    Ceramic Fibre Hardener Application Guide

    Learn the best application methods, coverage rates and drying recommendations to achieve a stronger, longer-lasting ceramic fibre surface.

    Choose the Right Application Method

    Brush Application

    Best for repairs, touch-ups and smaller areas where maximum control is required.

    Spray Application

    Ideal for coating large surfaces quickly and achieving an even finish.

    Dip Application

    Suitable for smaller components requiring complete saturation before installation.

    Best Practice

    • Remove loose fibres and dust before application.
    • Apply several light coats rather than one heavy coat.
    • Allow the rigidiser time to penetrate the ceramic fibre.
    • Ensure the treated surface is completely dry before use.
    • Gradually heat the insulation during the first firing.

    Coverage Guide

    Application Typical Coverage
    Light surface coating (approx. 4 mm) ~2.5 L/m²
    Full saturation (25 mm blanket, 128 kg/m³) ~17 L/m²
    Not sure how much you'll need?

    Coverage will vary depending on the type, density and condition of the ceramic fibre, along with your chosen application method. If you're unsure, contact our team and we'll help estimate the quantity required for your project.

    Drying & Curing

    • Allow a minimum of 24 hours for air drying.
    • Heated or oven drying may be used if required.
    • Avoid rapid drying, which may cause surface migration.
    • Gradually increase temperature during the first heating cycle.

    Related Ceramic Fibre Products

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