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Sandwich panels are widely used in the construction industry due to their versatility and efficiency, play a crucial role in creating sustainable and aesthetically appealing structures. However, it is essential to understand the fire reaction classification of these panels as mandated by the European law UNI EN 13501. This article aims to provide an overview of the fire reaction classification system for sandwich panels and its significance in ensuring the safety and compliance of construction projects. We will delve into the testing methods, parameters, and different fire reaction classes, along with practical applications and considerations for fire safety in relation to sandwich panels.

European law UNI EN 13501: –

Sandwich Panels fire reaction

Introduction to Sandwich Panels and Fire Safety

What are Sandwich Panels?

Sandwich panels are a popular construction material that consist of two outer layers (skins) and a core material in between. This core material can be made of various materials, such as expanded polystyrene (EPS) or mineral wool. Sandwich panels are used in a wide range of applications, from walls and roofs to ceilings and partitions. They are valued for their lightweight nature, thermal insulation properties, and ease of installation.

Importance of Fire Safety in Construction

Fire safety is a paramount consideration in any construction project. A fire can cause severe damage to property, endanger lives, and result in significant financial losses. Therefore, it is crucial to ensure that the materials used in construction, including sandwich panels, are fire-resistant and comply with fire safety regulations. This ensures the safety of occupants and reduces the risk of fire spread.

Overview of European Law UNI EN 13501

Background of UNI EN 13501

UNI EN 13501 is a European law that establishes a common classification system for the fire reaction of construction products. It provides a standardized methodology for assessing the performance of materials in relation to fire, enabling manufacturers and regulators to classify and compare products effectively. This law was developed to enhance fire safety standards across Europe and ensure consistency in fire reaction classification.

Scope and Objectives of the Law

The scope of UNI EN 13501 covers various construction products, including sandwich panels. Its primary objective is to determine the reaction of materials to fire, considering factors such as heat release, smoke production, and flaming droplets/particles. By establishing a clear classification system, the law helps in making informed decisions regarding the selection and use of suitable materials for different applications, promoting fire safety in the construction industry.

Fire Reaction Classification System

Understanding Fire Reaction Classification

Fire reaction classification categorizes materials based on their performance during a fire. The classification system provides a quick way to assess the behaviour of a material when exposed to fire, allowing professionals to choose materials that align with specific fire safety requirements. The classes range from A1 (non-combustible) to F (products that do not meet the specified criteria for any of the other classes).

Components of Fire Reaction Classification System

The fire reaction classification system considers various parameters, including heat release rate, smoke production, flaming droplets/particles, and the ability to resist the spread of fire. These parameters help determine the overall fire reaction classification of a material. Additionally, the system acknowledges the importance of fire resistance duration, which evaluates a material’s ability to maintain its structural integrity and protect against fire spread for a specified period.

Testing Methods and Parameters for Sandwich Panels

Test Standards for Sandwich Panels

To determine the fire reaction classification of sandwich panels, standardized testing methods are employed. These tests evaluate the performance of the panels under specific fire conditions and measure parameters such as heat release rate, smoke production, and flaming droplets/particles. Commonly used test methods include the Single Burning Item (SBI) test and the Cone Calorimeter test, which provide comprehensive data for classification purposes.

Parameters Considered in Fire Reaction Testing

Fire reaction testing for sandwich panels assesses key parameters that influence the overall fire safety performance. These include the fire propagation index, which measures the degree of fire spread; the smoke production index, which assesses the amount and toxicity of smoke emitted; and the flaming droplets/particles index, which evaluates the risk of fire projectiles. These parameters collectively contribute to determining the fire reaction classification of sandwich panels as per the European law UNI EN 13501.


Understanding the Different Fire Reaction Classes

When it comes to the fire reaction classification of sandwich panels, there are four main classes to consider: Class A1, Class A2, Class B, and Class C. Let us break them down one by one:

Class A1

Class A1 is the highest fire reaction class, meaning it has the most exceptional resistance to fire. Sandwich panels in this class have a non-combustible core and do not contribute to the spread of fire. They are like the superheroes of the panel world, ready to swoop in and save the day when it comes to fire safety.

Class A2

Class A2 panels also offer great fire resistance but are just a notch below their A1 counterparts. They have a limited combustibility and pose minimal risk when it comes to fire spread. Think of them as the sidekicks who may not have all the superpowers, but they are still pretty darn reliable.

Class B

Class B panels fall into the moderate category for fire reaction. They have a combustible core, but their contribution to the fire spread is limited. While they may not be as impressive as A1 or A2 panels, they still put up a decent fight against fire.

Class C

Class C panels, on the other hand, have a higher risk of fire spread. They have a combustible core and can contribute to the rapid spread of flames. You could say they are the troublemakers of the panel family, so extra precautions are necessary when using them.

Importance of Fire Reaction Classification for Sandwich Panels

Understanding the fire reaction classification of sandwich panels is crucial for a couple of reasons:

Ensuring Safety in Building Construction

Nobody wants to be caught in a building that turns to toast at the first hint of fire. By choosing sandwich panels with a higher fire reaction class, you are investing in the safety of the building’s occupants. It is like having a fireproof shield protecting everyone inside.

Compliance with Fire Regulations

Fire regulations are in place to save lives and reduce the damage caused by fires. Adhering to these regulations is not only a legal requirement but also a moral obligation. By using sandwich panels that meet the necessary fire reaction classification, you are playing by the rules and doing your part in keeping buildings safer.

Compliance and Certification for Sandwich Panels

When it comes to compliance and certification for sandwich panels, there are a few key aspects to consider:

Requirements for Compliance

To ensure compliance, sandwich panels must be tested according to the European law UNI EN 13501. This testing involves subjecting the panels to rigorous fire reaction tests to determine their classification. Only panels that meet the specified criteria will be deemed compliant.

Certification Processes

Certification bodies play a significant role in the compliance process. These organizations evaluate the performance of sandwich panels and issue certificates based on the test results. By obtaining certification, manufacturers can demonstrate the fire safety of their panels, giving customers peace of mind.


About Us

DANA Steel ( is an ISO 9001:2015 certified company, with the rich experience of around three decades, we have always thrived hard in order to bring revolutionary changes to the steel industry; We have our state of the art Cold Rolling Mill (CRM Complex) Situated in DIC (Dubai Industrial City) we proudly manufacture our products in Dubai, UAE.

Our market extends over a wide demographic as we export over products to around 50 countries including countries from the Indian subcontinent (Bangladesh, India, Nepal); South-East Asian countries (Indonesia, Thailand, Vietnam); Middle-East countries including members of GCC  (GCC-Saudi Arabia, Bahrain, Kuwait, Jordan, and Oman)( Riyadh, Dammam, Khobar, Jeddah, Yanbu, Jubail Ibri, Salalah, Muscat, Sohar, Nizwa, Barka). We also have our markets extended to Africa (Djibouti) and South America. With our constant commitment to customer contentment, we can provide competitive prices and faster shipment to all our valuable clients.

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