Dachin SF 280
Galvanized surface special graphene coating

Main Components

A two-component, high-solids, air-drying, high-build graphene coating specifically designed for galvanized surfaces. Component A consists of low molecular weight epoxy resin, pigments/fillers, pure carbon-layered graphene, additives, and solvents. Component B is a specially modified curing agent.

Key Features

1. Environmentally safe: Low VOC, free of heavy metals and coal tar. Non-polluting with zero substance leaching after underwater curing.
2. Exceptional corrosion resistance: Suitable for extreme atmospheric environments, seawater, freshwater, potable water, soil burial, and chemical immersion.
3. Graphene's lamellar structure creates a labyrinth effect, effectively blocking corrosive media penetration.
4. Excellent flexibility and impact resistance. Maintains integrity under high-low temperature cycling without cracking, even at ultra-high film thickness.
5. Superior mechanical properties: Adhesion strength exceeding 10MPa. Resists cracking/delamination under thermal cycling.
6. Combined primer-topcoat functionality: Eliminates multi-coat systems with single application, reducing time and costs.
7. Surface preparation tolerance: Accepts power tool cleaning (ST2/ST3 grades) and intact aged coatings.

Primary Applications

• Bridges, marine engineering, petrochemical plants, and construction machinery steel structures.
• New marine equipment: Offshore wind turbines, oil platforms, FPSOs, tension-leg platforms, jack-up rigs.
• Marine maintenance: Steel piles, wharves, bridge piers, sluice gates, breakwaters, dams.
• Other sectors: Oil/gas pipelines, storage tanks, chemical plants, desalination plants, waste-to-energy facilities.
• Complies with JT/T 722-2023 (Highway Bridge Corrosion Protection) and JT/T 733-2021 (Port Machinery Coatings).

Technical Specifications

Color	Beige / Light Gray
Non-volatile content by volume, %	66.7±1
Specific gravity, kg/L	1.46±0.04

Packaging Specifications

	Package Weight / kg	Package Volume / L
A	26.25	16.8
B	3.75	3.8
Total	30	20.6

Basic Parameters

Mixing Ratio	Weight ratio A:B=7:1 Volume ratio A:B=4.4:1
Pot Life	20°C: 2h | 30°C: 1h
Theoretical Coverage	~6.6 m²/L at 100μm DFT
Recommended DFT	100-200μm

Recoating Intervals

Temperature	Surface Dry	Hard Dry	Recommended Topcoat Interval
			Minimum	Maximum
10°C	4h	24h	24h	28d
20°C	1.5h	12h	12h	20d
30°C	1h	8h	8h	14d

Data based on standard film thickness applied on tinplate substrate.

Application Conditions

Dachin SF 280 Graphene Coating for Galvanized Surfaces should be applied via airless spray at temperatures above 5°C. Surface temperature must remain at least 3°C above dew point, with maximum relative humidity of 85%. Substrates must be clean and dry. Ensure ventilation in confined spaces.

Mixing: Thoroughly stir Component A with mechanical tools before mixing with Component B to redistribute any settled particles. Mixed material must be used immediately and discarded after the specified pot life. Maintain clean and dry tools before/after application.

Application: Multiple coats may be required via brush/roller to achieve specified film thickness. Recoat time may be extended.

Film Thickness: Adjustable based on application requirements, which will affect coverage rate, drying time, and recoat intervals.

Thinner: Not required.

Recoating: Recoat intervals depend on exposure conditions. If maximum interval is exceeded, profile the surface to ensure intercoat adhesion. Contaminated surfaces must be high-pressure washed and dried before recoating.

Recoating Notes: Consult manufacturer for interval adjustments under specific conditions. Surfaces must be completely clean. Remove contaminants with appropriate cleaners followed by high-pressure water rinse. Profile surfaces if exceeding maximum intervals.

Compatible Coatings

Next coats: Dachin PU 770 Acrylic Polyurethane Coating, Dachin PS 990 Polysiloxane Coating, Dachin FC 880 Fluorocarbon Coating

Recommended Coats

1 coat via airless spray or 2-3 coats via conventional spray/brush. Target DFT: 200-400μm.

Surface Preparation

Ensure surfaces are free of oil, dust, weld slag, and other contaminants before application.

Surface Treatment	Cleanliness	Method	Roughness	Expected Service Life
Minimum	St2-St3	Manual/power tools (wire brushes, grinding discs)	Original surface	15 years
Optimal	Sa2.5	Blast cleaning	60±10μm	>30 years

Mixing

This product consists of Component A (base) and Component B (curing agent). Stir each component separately with mechanical tools before precise ratio mixing. Ensure thorough blending.

Application Methods

Method	Thinner	Dilution	Nozzle Orifice	Pressure
Airless Spray	Dachin Thinner X17	0%	0.45-0.58mm	12-15 MPa
Conventional Spray	Dachin Thinner X17	10-15%	1.5-2.0mm	0.3-0.4 MPa
Brush/Roller	Dachin Thinner X17	0-5%	-	-

Dilution percentage calculated by paint weight.