Indoor Non-intumescent Gypsum-based Fireproof Coating

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Fire resistance and heat insulation: in case of fire, it relies on its own incombustibility and low thermal conductivity to form a heat insulation layer, which effectively improves the fire resistance of the steel structure.
Environmental protection and safety: the product is composed of granular lightweight mineral materials, ordinary gypsum, and a small amount of adhesive. It contains no asbestos, heavy metals, or other harmful ingredients. Under high-temperature flame conditions, the coating produces no smoke or fumes.
The coating is stable: the coating features strong adhesion and high strength; after drying and curing, it is resistant to cracking, hollowing, or peeling.

1. Mixing ratio of coating

A component: water=1: (0.9 ~ 1.1), The amount of mixing water can be appropriately adjusted based on the viscosity of the wet mixture.
Component B: water = 1: 1.5, stir until the accelerator is completely dissolved.

2. Paint construction.

Pre‑mix Component B with water in the accelerator pump at the specified ratio, stirring continuously for no less than 15 minutes until fully dissolved. Meanwhile, mix Component A with water in a mixer and adjust the viscosity until uniform. Only then can it be used.
Connect the equipment as required, adjust the flow rate of the accelerator solution, start the machine, and spray the coating into a fixed container (e.g., a 1-liter measuring cup). Weigh it on a scale; the amount should be controlled within the range of 550–750 grams. Based on the foaming effect of the accelerator, adjust its dosage to control the coating consumption and ensure that the later compressive strength of the coating meets the standard requirements.
After equipment commissioning, begin the spraying operation. Spray evenly up and down on the work surface. To achieve full foaming, uniform coverage, and a good appearance, the thickness of a single pass should not exceed 2 cm, as greater thickness may affect the coating's appearance. Use a needle‑type thickness gauge to measure the thickness, and repeat until the target thickness is reached.

No.	Inspection and testing items	Standard clause number	Standard requirements	Check the test results	Conclusion
1	Bond strength (MPa)	GB14907-2018 5.2.1、6.4.4	≥0.04	0.14	Qualified
2	Water resistance	GB14907-2018 5.2.1、6.4.9	After 24h test, the coating shall be free of peeling, foaming and falling off, and the attenuation of thermal insulation efficiency shall be ≤ 35%.	After 24 hours of test, the coating has no peeling, foaming and falling off, and the attenuation of thermal insulation efficiency is 12%.	Qualified
3	Resistance to cold and hot cycles	GB14907-2018 5.2.1、6.4.10	After 15 tests, the coating shall be free of cracking, peeling and blistering, and the attenuation of thermal insulation efficiency shall be ≤ 35%.	After 15 times of tests, the coating has no cracking, spalling and blistering, and the attenuation of thermal insulation efficiency is 18%.	Qualified
4	Fire resistance（Fp2.00）	GB14907-2018 5.2.3、6.5.6、6.5.7	Fire resistance time ≥ 2.00h; the maximum bending deformation of the test piece shall not exceed the specification limit; The average temperature of the test piece shall not exceed 538 ℃.	The measured coating thickness is 20 mm, the fire resistance test time is 2. 00 H, and the maximum bending deformation of the specimen is 28. 58 mm. Average temperature of test piece 510.90 ℃	Qualified