Product Name: Flame Retardant Gelcoat HS - LFI7035S
1. Brief Introduction:HS-LFI7035S Gelcoat is an advanced intumescent flame retardant gel coat, featuring an Isophthalic-adipic acid unsaturated polyester resin base.
Ideal for spray processes and pre-promoted for efficiency, this gel coat is designed for Flame-Retardant FRP product surfaces.
.It is applied in
rail transit, wind turbine nacelle covers, ship accessories, and other sectors demanding high flame retardancy.
2. Features: · Exceptional construction performance;
· Superior flame retardant properties (high oxygen index, low smoke density);
· Compliance with UIC564-2 Class B fire protection standards;
· Excellent 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 test: Curing agent M-50 (AKZO) at 2%.
4 . Application Notes :1). Gently mix the gelcoat in the bucket before use to avoid excessive shear rates and air entrapment.
during mixing.
2). Optimal application temperature is between 18-25°C with humidity below 80%. Ensure the mold is
polished and clean before gelcoat application.
3). Ensure the mold surface is dry, clean, and oil-free.
4). The mold surface should be fully waxed (avoid silicone-based release wax). Allow water-soluble release wax to dry completely before gelcoat spraying.
water-soluble release wax must wait for its moisture to evaporate before spraying the gelcoat.
5). Use MEKP as the curing agent (typically 1-3%).
6). The gelcoat film's total thickness should be between 600 and 1000μm. Each spray layer should not exceed 0.2mm, with a 2-3 minute wait for solvent volatilization before applying subsequent layers.
shall not be more than 0.2mm, wait for 2-3 minutes after the solvent volatilizes, then spray to the
required thickness..
7). Verify gelcoat curing before starting lamination layers. Press your finger on the gelcoat film for 30 seconds; if no residue is left on your finger and the gelcoat remains tacky, proceed with lamination.
5. Operation procedure:
Note: When spraying, maintain air source pressure at 20psi with a minimum air flow of 0.6 cubic meters per minute.
1). Prepare for spraying, following the application guide's requirements.
2). Apply a thin layer of easy-polishing primer (no thicker than 0.2mm) on the original mold surface using multiple thin passes. After 2 minutes of evaporation, spray the next layer to the desired thickness. The primer will dry within 1 hour, allowing for sanding.After 2 minutes of evaporation, spray the next layer to the desired thickness. The primer will dry within 1 hour and you can start sanding.
3). Perform dry sanding with 220-320 mesh sandpaper, followed by 600-1200 mesh water sandpaper, then polish.
6. Storage:
1) To ensure optimal performance and longevity of our Urban Railway Flame Retardant Gel Coat with Superior Weather Resistance, avoid exposure to heat sources such as direct sunlight or steam pipes. Store in a dry, well-ventilated area at temperatures below 25ºC to maintain product integrity.
2) Always keep containers tightly sealed to prevent moisture absorption and monomer evaporation. Extended storage beyond recommended conditions can negatively impact key properties such as viscosity and gelation time, compromising product performance.
3) Transportation must comply with the State Council 'Chemistry Dangerous Articles Safety Management Regulations.' Given the presence of styrene monomer, our product is classified as hazardous and highly flammable, necessitating stringent safety measures during transport.
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