A fireproof coating is a thin layer of material that is applied to a steel structure to make it more resistant to fire. Purpose and application
To protect the steel headbearing structure of a building against the effects of fire, it must be treated with fire. This protection can be performed by tearing off with fire resistant plates, spraying with a low fire resistant patch or with foaming fireproof coating. This way the building can be evacuated safely in case of fire without risk of collapse.
Fire-resistant plate and plaster derive their functionality mainly from their thickness. Therefore, in situations where the steel structure remains visible, it is often chosen for the much thinner foaming fireproof coating, even because it can be painted in the desired color. The required layer thickness of fireproof coating depends on the profile factor of the steel part, the load rate of the construction on site and the statutory requirement for the building (eg 30, 60, 90 or 120 minutes of fire resistance, this may vary per floor) . Also the results of one or more fire tests in a test oven are included in the calculation. Operation
Coating the coating is a complex process in which various functional fillers react with heat to each other so that the "coating" of 0.2 to 2 mm blows itself up to a centimeter thick foam layer. The insulating effect of this foam keeps the steel under the critical temperature for some time, as it would fail. These temperatures range from 400 to 700 ° C, while the coating begins to work from 250 ° C steel temperature.
The details of the foaming process are not fully known and vary by case, but a number of partial processes can be distinguished:
The heat of steel in fire is counteracted by the following factors:
In addition to thin-layer fire-resistant coatings, there are also larger layer thickness systems (single cm) for very high fire resistances in the offshore and petrochemical industry. By using two-component binders, these coatings are much better resistant to moisture and mechanical stress than the thin layer coatings.
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