Durable Gel Coat for Urban Railway with Flame Retardant Properties

Product Description

Product Description

Product Name:Flame RetardantGelcoat HS - LFI7035S

1. Brief Introduction:HS-LFI7035S Gelcoat is an intumescent, flame-retardant gel coat crafted with Isophthalic-adipic acid unsaturated polyester resin as its base.Perfectly suited for spray applications, this pre-promoted gel coat is ideal for FRP surfaces that necessitate superior flame retardancy.
.Widely applied inrail transit systems, wind turbine nacelle covers, marine accessories, and other sectors demanding stringent flame retardant standards.
2. Features: · Outstanding construction performance;
· Exceptional flame retardant characteristics (high oxygen index, low smoke density);
· Compliance with UIC564-2 Class B fire protection standards;
· Superior water and weather resistance.
3. Gelcoat Properties:

Test Item	Unit	Test Value	Test Method
Appearance	--	Gray paste liquid	--
Viscosity(25ºC)	mP·s	5000-8500	ISO2555:2018 Brookfield RV/DV-I Spindle 6-10 RPM
Gel time(25ºC)	min	15.0-35.0	ISO2535:2003
Thixotropic index	--	≥3	ISO2555:2018Brookfield
			RV/DV-I

Gel time testing: Curing agent M-50 (AKZO) at a 2% concentration.
4 . Application Notes :1). Gently mix the gelcoat in the container before use, avoiding excessive shear rates and air entrapment.
during mixing.
2). Optimal application temperature should range between 18-25°C with humidity below 80%. Ensure the mold is
polished and clean before applying the gelcoat.
3). Prepare the mold so that its surface is dry, clean, and free of oil.
4). Completely wax the mold's surface (avoid silicone-based release wax). Allow water-soluble wax to dry before applying the gelcoat.
water-soluble release wax must wait for its moisture to evaporate before spraying the gelcoat.
5). Use MEKP as the curing agent for the gelcoat (dosage generally ranges from 1-3%).
6). Gelcoat film thickness should be between 600 and 1000μm. Each layer should not exceed 0.2mm. After the solvent evaporates (2-3 minutes), spray to the required thickness.
shall not be more than 0.2mm, wait for 2-3 minutes after the solvent volatilizes, then spray to the
required thickness.
7). Check the gelcoat's cure degree before starting lamination. Press your finger on the gelcoat for 30 seconds. If no residue appears but the gelcoat remains sticky, proceed with lamination.
5. Operation Procedure:
Note: Use a paint spray can with an air pressure of 20psi and a minimum air flow of 0.6 cubic meters per minute.
1). Prepare for spraying as per the application guide requirements.
2). Apply a thin, easy-to-polish primer layer (no thicker than 0.2mm) using multiple thin passes. Allow to dry.After 2 minutes of evaporation, apply the next layer to the desired thickness. Primer dries within an hour, allowing for sanding.
3). Perform dry sanding with 220-320 grit sandpaper, then follow with 600-1200 grit wet sandpaper before polishing.
6. Storage:
1) To ensure optimal quality, avoid exposing the product to heat sources such as direct sunlight or steam pipes. Store in a dry environment at temperatures below 25ºC.
2) Maintain a tightly sealed container to prevent moisture absorption and monomer evaporation. Prolonged storage outside the recommended conditions may impact liquid resin properties such as viscosity and gel time.
3) Transportation must comply with the State Council's 'Chemistry Dangerous Articles Safety Management Regulations.' As the product contains styrene monomer, it is classified as hazardous and flammable.

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