service

GRP/FRP insulation comprises an unsaturated polyester resin matrix reinforced with 450 gsm chopped strand mat (CSM), finished with a pigmented gel coat, cured using MEKP catalyst, and managed with liquid paraffin wax for mold release and surface finish control.

The laminate provides a corrosion‑resistant, lightweight cladding suitable for insulated vessels, ducts, and housings where chemical resistance and weather protection are required.

Key design considerations

• Resin selection and chemistry: Choose a polyester grade (orthophthalic, isophthalic, or vinyl ester alternatives) that meets the required chemical resistance and temperature limits; control styrene content and viscosity for wet‑out and worker safety.
• Reinforcement uptake and laminate schedule: 450 gsm CSM requires higher resin uptake; specify target fiber‑to‑resin ratio and use peel‑ply or surfacing veil to control surface porosity and adhesion for secondary bonding or coatings.
• Gel coat application and surface quality: Apply gel coat at specified thickness and allow proper tack‑off to avoid blush or pinholes; coordinate gel coat cure window with subsequent lamination to ensure chemical bonding.
• Cure control and exotherm management: Dose MEKP precisely and account for ambient temperature, laminate thickness, and mold geometry to avoid excessive exotherm, porosity, or thermal distortion.
• Mold release and secondary bonding: Use liquid paraffin wax sparingly and validate that release agents do not contaminate bonding surfaces; specify post‑release cleaning or use peel‑ply where secondary bonding is required.
• Health, safety, and environmental controls: Implement ventilation, styrene exposure controls, peroxide handling procedures, and PPE; manage waste resin and catalyst per regulations.
• Mechanical and thermal performance: Define required compressive strength, impact resistance, and thermal cycling tolerance; consider adding woven roving or stitched fabrics where higher tensile or impact loads are expected.
• Durability and maintenance: Specify UV‑stable gel coats, chemical‑resistant topcoats, and inspection intervals for cracking, delamination, or gel‑coat degradation.
• Quality assurance and testing: Require laminate thickness checks, adhesion tests, void content inspection, and cure verification (e.g., MEKP residuals, Tg measurement) as part of acceptance.