How to Choose the Right Refractory Ceramic Fiber Blanket for Industrial Furnaces

Choosing a refractory ceramic fiber blanket for an industrial furnace is not simply a choice between 1260°C and 1430°C. One of the most common mistakes is treating the classification temperature as the actual long-term operating temperature.

In practice, furnace temperature, continuous operating time, thermal cycling, and installation position should all be considered.

1260°C vs 1430°C: Key Data Comparison

The following table shows typical published data for common ceramic fiber blanket grades. Actual values vary by formulation and refractory ceramic fiber manufacturer.

The figures above are typical published values and should be confirmed against the technical data sheet of the selected product.

When Is 1260°C Grade Suitable?

A 1260°C refractory ceramic fiber blanket can be a practical choice when the actual long-term temperature remains within its recommended operating range.

For example, published technical data for standard 1260°C blankets commonly shows continuous use around 1050°C, while high-purity 1260°C grades may reach approximately 1100–1150°C.

This means a furnace with a short-term peak of 1200°C does not automatically require a 1430°C blanket. If the blanket is installed behind a hot-face lining and its actual service temperature is significantly lower, a 1260°C grade may be sufficient.

When Should You Choose 1430°C?

A 1430°C refractory ceramic fiber blanket is generally more suitable for hotter areas, higher continuous temperatures, and applications requiring greater temperature margin.

Published data for 1430°C zirconia-containing blankets commonly lists continuous use temperatures around 1350°C, with permanent linear shrinkage tested after exposure at approximately 1350°C.

In one furnace project, the customer initially selected one insulation grade for the entire furnace. After reviewing the installation positions, we found that the upper hot zone and burner area operated under much more demanding conditions than the outer wall. Using the same material throughout would have increased unnecessary cost.

The more practical approach was to select the refractory ceramic fiber according to the temperature of each installation area.

Do Not Select Only by Furnace Temperature

Before purchasing a refractory ceramic fiber blanket, customers should confirm:

• Actual continuous operating temperature

• Maximum temperature and holding time

• Heating and cooling frequency

• Installation position

• Direct or indirect exposure to heat

• Required thickness and density

• Expected service life

Thermal cycling is particularly important. A blanket used in a furnace that heats and cools several times each week may experience different conditions from one used in continuous production.

What Should You Check with the Manufacturer?

When contacting a refractory ceramic fiber manufacturer, do not provide only the furnace's maximum temperature.

It is better to provide the temperature at the installation position, operating cycle, blanket thickness, density requirement, and furnace drawing when available.

The correct choice is not always the highest temperature grade. A properly selected refractory ceramic fiber blanket can provide the required insulation performance while avoiding unnecessary material costs.

For industrial furnace applications, 1260°C and 1430°C materials should therefore be selected according to actual long-term working conditions, not simply according to the highest temperature shown on the furnace specification.