CE mark for technical insulation products

CE what's in it for me?


From August 2012, all technical insulation products must be CE marked. This is done according to the following harmonised product standard: EN 14303 Thermal insulation products for building equipment and industrial installations – Factory made mineral wool (MW) products – Specification. When a product is CE marked, no other local product quality marks can be required on the European market. Voluntary quality marks are still allowed.

CE marking is a quality system that shows the performance of the product, not that the product is approved for a specific application. The mark shows that the product fulfils the declared properties and that it is safe to use. In all European countries, there are local regulations which define what properties a product needs in a certain application. It is important to check that the declared property fulfils the requirements for the specific application.

Product might be good as thermal insulation but has a very bad reaction to fire classification or water absorption, and if all properties are needed, you should choose a product with declared values that meets your needs.

In this site we explain properties that can be declared, how it is done and what is important to know when using CE marked technical insulation products.

It is the manufacturer of the product that has the responsibility to declare that every product put on the market fulfils the declared properties that are shown in a "Declaration of Performance". Paroc has a "Certificate of constancy of performance" issued by a Notified Body, which means that a third party surveys all products and that we at Paroc live up to what we promise.

Right product for your application

PAROC has a wide range of products, optimised for each specific application. High temperature, fire, condensation or other requirements, we have a solution. It is easy to find the right product due to the application-based names with PAROC Hvac, Pro and Marine products. For more information regarding the CE mark and our product range, please contact us.

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More information about CE standards you will find on CEN homepage

For all applications

The following properties are mandatory to declare for all technical insulation products that shall be CE marked, regardless of application.

The thermal resistance is the property explaining how well a product resists thermal transmission through the material. This is one of the main reasons to insulate: to reduce unwanted heat losses in installation and building structures. The thermal performance of an insulation material is often given as the thermal conductivity (lambda value). The lower the lambda value is, the better the insulation.

The thermal conductivity (lambda) depends on temperature and moisture. Since lambda is dependent on temperature, it is very important to use the right product for the right application. A product with good (low) lambda value at 10°C might not have a good lambda value at 100°C.

Lambda table

Moisture affects the materials thermal conductivity since water has a much worse lambda value than air. See the table below.

Material  Lambda λ10 -value, W/mK 
Stonewool, perpendicular to fibers 0.033 – 0.039

parallel to fibers

0.039 – 0.050
Wood 0.14
Carbon steel 60
Air 0.025
Water 0.6
Ice 2.3 

Thermal conductivity of PAROC stone wool products do not change with time, and will keep their thermal properties throughout the lifetime of the installation. Lambda values can be declared by the lambda-temperature curve or in a table with lambda and thermal conductivity values. The unit for thermal conductivity is W/(m x K). The value is rounded up to closest 0.001 W/(m x K). If the product has a declared maximum service temperature, the lambda values shall be declared up to that temperature.

Lambda values declared by Paroc are tested in accordance with the harmonised European standards EN 12667 for flat products and EN ISO 8497 for pipe sections.

Thermal conductivity is not shown in the designation code, but must be visible in the Declaration of performance and in the product information.

You will find these documents on the product pages.

The reaction to fire classification describes how the product, as placed on market, contributes to fire development in the early phase of a fire. This is called Euroclass, which shall be determined in accordance with EN 13501-1. A material with a good Euroclass delays flashover as long as possible. After that, it is the fire resistance of a structure that is important (e.g. EI classification).

Reaction to fire is described with Euroclass A-F, with the addition of how much smoke (s1-s3) and flaming droplets (d0-d2) the product creates when exposed to fire.


  Contribution to fire
A - B - C - D - E - F
Smoke intensity
s1 - s2 - s3 
Burning droplets
d0 - d1 - d2
A1  Flashover not possible No test needed No test needed
A2 Flashover not possible s1 = No or very little smoke

s2 = Limited amount of smoke

s3 = Much smoke
d0 = No burning droplets

d1 = Droplets burn for less than 10 sec

d2 = No demand
Flashover not possible
C Flashover after more than 10 minutes
D Flashover between 2 and 10 minutes
E Flashover in less than 2 minutes Not tested - or d2
F Not tested Not tested Not tested


Examples of Euroclass

* A2-s1, d0 (Flashover not possible, no or very little smoke, no burning droplets)

* B-s3, d1 (Flashover not possible, much smoke, droplets burn for less than 10 seconds)
For pipes the same Euroclasses are used, but with the subscript index “L” (e.g. A2L-s1, d0).

Reaction to fire table

PAROC stone wool is Euroclass A1 and does not contribute to the development of a fire. The requirement varies depending on national regulations and those vary between European countries. PAROC stone wool reaction to fire does not change over time and gives the same top level, maintenance-free fire safety during the entire lifetime of the installations.

The Euroclass of the product is not shown in the designation code, but shall always be shown on the Declaration of performance and other product related information (e.g. datasheets and on the product label).

In the dimension and tolerances declaration it is shown what tolerances the product has for different dimensions. The dimensions are length, width and thickness for flat products and, for slabs and boards, squareness. For pipe sections the dimensions are length, thickness, inside diameter, thickness uniformity and squareness.

Thickness tolerances are described as classes from T1 to T9 according to the table below:

Thickness tolerances

Level or class


T1 -5 % or -5 mma Excess permitted 
T2 -5 % or -5 mma  +15 % or +15 mmb
T3 -3 % or -3 mma +10 % or +10 mmb
T4 -3 % or -3 mma +5 % or +5 mmb
T5 -1 % or -1 mma +3 mm
T8 -5 % or -3 mma +5 % or +3 mma
T9 -6 % or -5 mma +6 % or +5 mma

a = whichever gives the greatest numerical tolerance.
b = whichever gives the smallest numerical tolerance.

Other dimensional tolerance requirements according to EN 14303 are:

Form of delivery Width Length Thickness class  Inside diameter  Thickness uniformity  Squareness
±1,5 % ±2 % T3 - T5     ±5 mm/m
±5 mm +excess
-0 mm
T4 ja T5      
±10 mm +excess
-0 mm
T2 ja T3      
Batts, mats, rolls, quilts, mattress, feltsb ±10 mm +excess
-0 mm
T1 - T5      
Pipe sections
Do <150 mm
  ±5 mm T8 +4 mm -0 mm Difference less than 6 mm or 10 % a ±4 mm or ±2 % of the external nominal diametera
Pipe sections
Do ≥150 mm
  ±5 mm T9 +5 mm tai +2 % -0 mm Difference less than 10 mm
or 12 % a
±4 mm or ±2 % of the external nominal diametera

a = whichever gives the greatest numerical tolerance.
b = T2 only.

PAROC stone wool always meets the requirements stated in the standard. Our internal requirements are even tighter.

The thickness tolerance class of, for example, T4 is shown in the designation code like this: T4.

Dimensional stability describes how well dimensions are maintained when the product is exposed to high relative humidity for a longer time (48 hours). The change in thickness, length and width shall not exceed 1.0%. For products where maximum service temperature is declared, the dimensional stability is not needed since the products have been exposed to a more severe test.
Unlike some insulation material on the market, PAROC stone wool does not change with time. Thermal conductivity, reaction to fire and dimensions such as thickness are intact for the lifetime of the installation.

For specific applications

The properties below are mandatory to declare only when the product application requires it. 

Maximum service temperature is very important in applications where the insulation will be exposed to high temperatures, continuously or in intervals. Especially in industrial applications this is a very important property. In most cases, a high density product can withstand a higher service temperature than a low density product.

Tests shall be carried out in accordance with EN 14706 for flat products and EN 14707 for pipe sections. The product is tested under a load, and the reduction of thickness is measured after the product has been exposed to declared temperature for 72 hours. If the reduction of thickness is less than 5% and there is no evidence of self-heating, the product has passed the test. If a product is used in an application with too high maximum service temperature, there is a risk of, for example, thickness reduction, which gives a worse thermal insulation over time.

When a maximum service temperature of, for example, 680 °C for a product is declared, it is shown in the designation code like this: ST(+)680.

Water absorption is a important property, since there are many applications where the insulation might be exposed to water, high humidity or other liquids, such as at building sites, as well as in case of leakages of tanks, pipes or other equipment. If the insulation absorbs water it might increase damage to the installation e.g. corrosion and also dramatically lower the insulation properties of the product (increase thermal conductivity). Wet insulation does not have the same thermal conductivity properties as declared.

If the water absorption is declared, test results cannot exceed 1.0 kg/m². Tests shall be determined in accordance with EN 1609 for flat products and EN 13472 for pipe sections. When testing, the product is placed in water for 24 hours, dried for 10 minutes and after that, the change in weight is measured (test method EN 1609 and EN 13472). PAROC stone wool does not absorb water and does not increase the risk of damage due to moisture.

When the water absorption is declared, it is shown in the designation code like this: WS1.

When a mineral wool product is used in an application where it is exposed to compression e.g. tank roofs, you need to know the compressive stress capacity. The compressive stress shall be determined in accordance with EN 826. It is declared at the maximum compression of 10% and with the unit of kPa.

Paroc declares the compressive stress for special products, such as roof slabs for tanks.

An example of the compressive stress shown in the designation code: CS(10)80

(the compressive stress to deform the product 10 % of its thickness is over 80 kPa)

Water vapour diffusion resistance is tested in accordance with EN 12086 for flat products and EN 13469 for pipe sections and declared as level MV1 or MV2.

Level  Requirement 
MV 1  100
MV 2 200

Water vapour diffusion equivalent air layer thickness.

PAROC stone wool has an open cell structure and does not affect the movement of water vapour. When water vapour resistance is needed, PAROC products with AluCoat® should be used. The AluCoat® facing is class MV2 and it provides the needed vapour barrier and works very well for cold pipes or ducts or other applications where water vapour resistance is required. For these applications, all joints need to be taped with suitable aluminium tape.

Test method EN 13468 is used to determine the level of ions and pH, which must be at the right level. Water soluble ions (or the wrong pH-value) can promote unwanted oxidation or corrosion. In some applications, especially in industry (e.g. at nuclear plants), this might be very important. PAROC stone wool is chemically inert and does not contribute to the oxidation process.

The ions that can be declared are water-soluble chloride (CL), fluoride (F), silicate (SI) and sodium (NA), and declared as mg/kg. For chlorides and fluorides, no test result shall exceed the declared value. For silicate and sodium, no test result shall be below the declared value. The pH-value shall not deviate from the declared level by more than 1.0. The most important factor is the chloride value of the product, which in many industrial plants is required to be less than 10 ppm.

When trace quantities of water soluble ions, for example, chloride and the pH value are declared, it is shown in the designation code like this: CL10 or pH10.

PAROC stone wool is a good sound absorption material due to its open structure. The sound absorption coefficient is tested and declared in accordance with EN ISO 354 and the sound absorption characteristics calculated according to EN ISO 11654.

What is a harmonised EN product standard?

All EN-standards are produced by the European Committee for Standardisation (Comité Européen de Normalisation, CEN) and all standards are approved in consensus among the member states. The members of CEN are all countries within the European Union and European Free Trade Association (EFTA).
A standard can be developed to contain a series of specifications and/or recommendations for products, systems, processes or services. A standard can also describe a measurement or test method or establish a common terminology within a specific sector.

The standard that concerns technical insulation, “EN 14303 Thermal insulation products for building equipment and industrial installations - Factory made mineral wool (MW) products – Specification”, is a product standard. All European countries must accept a CE marked product to be sold on their market. From 1 June 2013, when the CPD (Construction Products Directive) was replaced with the new CPR (Construction Products Regulation), it has been mandatory to adopt all ready EN standards.

The principle of the CPR is “aimed at the removal of technical barriers to trade in the field of construction products, in order to enhance their free movement in the internal market”. A CE marked product fulfils the essential requirements in the CPR, which means that it is safe for consumer, construction, and environment. The CE mark also makes the market more transparent and easier to compare different products, and the responsibility and monitoring of the properties are transferred from authorities to the market itself.
Standards are written by experts in the specific field. Experts are nominated via national standardisation bodies and can represent industry, trade associations, professional institutions, government, consumer bodies, customers, certification bodies, and more. CEN together with a chosen responsible National Standards Body administrate the process.

When a product standard is approved, it is published in the Official Journal and it shall be implemented within nine months after publishing. After this a twelve-month (sometimes longer) transitional period follows where all actors can implement and adapt to the standard.

A Certificate of constancy of performance is established by a third party, a notified body. The notified body checks that the manufacturer (e.g. Paroc) fulfils the declared values for each product. The minimum requirement to include in the Certificate of constancy of performance is reaction to fire class and Thermal conductivity.

Paroc has taken this one step further and has certified even more properties than required. This way it is guaranteed by a third party that we keep our promises and it is easy to see that we do so. For Paroc, Technical Research Centre of Finland (VTT) is the notified body.

The key document for CE marking is the Declaration of performance. This is the document that should always be available for you. In the declaration we as a manufacturer declare that all products conform to and fulfil what we promise. The declaration also states values for that specific product.

For all our CE marked products you will find the Declaration of performance on our website on product pages.

The Declaration of performance and the label on the package shall include the information of the manufacturer, the fire class and the thermal resistance or conductivity of the product. It shall also refer to which standard it has been assessed and include all other properties the manufactured needs or wants to declare. This declaration is given by a designation code on the label together with the CE-mark and the Declaration of performance number.

The designation code is a string of the declared properties for a product. In this, you can find what properties the manufacturer is declaring.

MW EN 14303 – T2 – ST(+)650 – CS(10)20 – WS1 – MV2 – CL10 – pH9,5

The explanation of the designation code is given in the relevant product standard, in this case EN 14303. The code starts with MW which means Mineral Wool followed by the standard EN 14303. The following abbreviations in the example are explained in the text above.