Corrosion protection of radiators explained.
The surface of standard radiators and convectors is protected against corrosion under “normal” storage and installation conditions. But what is “normal”? The definition of is outlined in the standard EN442-1.
Extracts from EN442-1:
"The pretreatment and paint processes used, shall provide a protective coating to all external surfaces in contact with the air which shall:
-give protection against corrosion in normal storage and installation conditions (as demonstrated by absence of surface corrosion after 100 h humidity test according to a relevant standard)1
-be resistant to minor impact damage as demonstrated by a 2 mm cross-hatch test with a single blade cutting tool manually operated according to ISO 2409:1992
The test result shall be within the first three steps (0-1-2) of table 1 of DS/EN ISO 2409
The paint shall emit no odors and no toxic fumes under normal operating conditions"
What does that mean exactly?
This means that the surface treatment must be able to withstand humid environment effects for 100 hours, in order to satisfy the minimum requirements for a radiator/convector (this is guaranteed).
In practice, however, Hudevad radiators would be able to withstand greater exposure.
The environment to which radiators and convectors may be exposed can be classified as follows: C1, C2, C3, C4.
The corrosion factors from the indoor climate can be worsened considerably by the purpose for which the building is used. Factors of this type may be present in wet rooms, in connection with swimming pools and indoor wellness containing chlorinated water, horse stables and other buildings with special usage areas.
Colder areas on structures may be exposed to increased corrosion factors due to occasional condensation.
A special pretreatment program, E-Coat, is offered for classes C3 and C4. E-Coat is a pre-treatment program ensuring that corrosion can be avoided in environments where standard radiator treatments do not offer protection.
These environments are as described in the above chart, under categories C3 and C4.
The process involves a special treatment, which can then be finished with the desired final colour/top coat.
How does that affect the product lifetime?
The durability of paint system protection is generally shorter than the expected service life of the construction. Therefore the feasibility of any future system maintenance or renovation required shall be considered at the planning and design stage.
The usable lifetime is not a “warranty period”. Usable lifetime is a technical term that can help the owner of the construction to plan a maintenance program. “Warranty period” is a legal concept, which is included in the terms and conditions agreed on in the administrative section of a contract. The warranty period is normally shorter than the usable lifetime. There are no rules linking these two terms.
In general, we recommend that the environment in which radiators and convectors are installed must be taken into account, so as to ensure optimum product service life and to eliminate any risk of corrosion.
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