Fireproof outdoor thick steel structure | KF-HF100 | Kexin New Materials

Fire-resistive / intumescent coatings series · Complete application process flow

Product No.: KF-HF100 Standard: GB 14907 | GB 28375 | GB 12441 | GA 98 Version: V2.0 Date: 2026-06-21
📥 Download Application Guide PDF
I. Pre-application preparation — Substrate inspection and treatment

1Substrate inspection and preparation standard

Preparation standard:Abrasive-blast steel to grade Sa2.0–2.5 (ISO 8501-1)

Roughness requirement:per product requirements

Cleanliness requirement:Free of oil/grease and rust

Primer application:A compatible anti-corrosion (rust-proof) primer must be applied first.

2Paint preparation and mixing

Mixing method:Stir thoroughly with a power agitator until uniform and free of sediment.

Pot life:The two-component product must be used up within the specified time.

Thinning：Add a small amount of clean water (waterborne) or the dedicated thinner (solventborne) as required.

3Environmental condition check

Application temperature:5-35°C

Relative humidity:relative humidity ≤85%

drying：Apply the next coat only after each coat has dried through.

II. Application procedure — Selection of coating method
Application methodProcess parametersApplicable scenarios
trowel application — Thick-film (heavy-coat) fireproof coating for steel structures
Spray coating Funnel-feed (hopper) spray gun, pressure 0.4–0.6 MPa Large-area application
Roller coating — Thin-film / decorative-type fireproof coating

Coating thickness control:Apply in multiple coats, each coat built up to the thickness required by the product. Thick-film type: ≤ 8 mm per coat; thin-film type: ≤ 0.5 mm per coat. Build up to the design thickness.

4. Safety and environmental requirements
⚠ PPE required: dust mask + safety goggles + gloves + safety shoes
⚠ Wear a safety harness for work at height.
⚠ Water-based products offer better safety; solvent-borne types require ventilation.
5. Quality inspection and acceptance criteria
Inspection itemsInspection methodAcceptance criteria
Dry film thickness Coating thickness gauge Meets the specified value, no negative tolerance
Bond strength Pull-off method ≥0.15MPa
Appearance Visual No cracking, hollowing or delamination
Fire performance fire-resistance rating test Meets the designed fire-resistance rating (h)
Prepared on the basis of:GB 14907 | GB 28375 | GB 12441 | GA 98 and relevant industry standards.
Important statement:This application guide is a recommended guidance document; actual application parameters should be adjusted according to site conditions, environmental status and coating system requirements. For special working conditions or difficult application problems, please contact the Kexin New Materials technical department for professional support.
Technical support:0757-88793275 | www.psste.com | Shunde District, Foshan City, Guangdong Province

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