Indoor intumescent waterborne fire retardant coating

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Expansion in case of fire: in case of fire, the coating expands rapidly by tens of times when heated, forming a dense and solid carbonized foam thermal insulation layer, which can block the heat transfer to the steel substrate like a "thermal insulation cotton-padded jacket" and win valuable fire-resistant time for the structure.
The coating is light and thin: on the premise of reaching the same fire endurance (such as 1.5 or 2 hours), the coating thickness (usually only 1-4 mm) is much lower than that of the non-intumescent thick coating, which has little effect on the dead weight and appearance of the steel structure.
Decorative: the coating surface is relatively flat and can be adjusted in color, which can meet the requirements of fire protection while taking into account a certain decorative effect.

Public buildings: large-span and exposed steel structures of large shopping malls, gymnasiums, theaters, airport terminals, railway stations, etc.
Industrial buildings: steel beams, steel columns and trusses for factory buildings and warehouses in petrochemical, electric power and electronic industries.
Civil building: indoor steel structure of high-rise building.

Base course treatment: thoroughly remove the dust, oil stain and rust on the steel surface. It is usually necessary to apply an anti-rust primer first.
Paint preparation: the paint shall be fully stirred with a stirrer before construction. If the paint is too thick, it can be diluted with a special diluent (such as 200 # solvent gasoline) according to the instructions.
Coating construction:
Method: brush coating, roller coating or spray coating can be used.
The key is that it must be painted several times. The first coat should be applied thinly (about 0.1-0.5mm) to enhance adhesion.
After the surface of the previous coat is dry (usually at intervals of several hours), the next coat shall be applied until the total design thickness is reached.
Curing: after the construction is completed, the coating shall be protected from rain and collision before it is fully cured, and a sufficient curing period (up to 60 days) shall be provided.

Core Performance Test Data/ Serial number	Inspection Items/Terms	Requirements for inspection and judgment basis	Measured results	Itemized judgment
1	Bond Strength (MPa)	≥0.15	0.54	Qualified
2	Water resistance	After 24h test, the coating shall be free from peeling, foaming and falling off.	Conform	Qualified
2	Water resistance	The attenuation of insulation efficiency shall be ≤ 35%.	12.8%	Qualified
3	Resistance to cold and hot cycles	After 15 tests, the coating shall be free from cracking, peeling and blistering.	Conform	Qualified
3	Resistance to cold and hot cycles	The attenuation of insulation efficiency shall be ≤ 35%.	9.3%	Qualified
4	Fire resistance	Coating thickness of intumescent fireproof coating for steel structure ≥ 1.5mm; Fire resistance: Fp 1.50.	Measured coating thickness:2.1mm; Fire resistance test time: 1.50h	Fp1.50 Qualified