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Home / Products / GRP Polyester Resin

GRP Polyester Resin

Unsaturated polyester resin for GRP water tank lining and composite lay-up applications.

MEKP CatalysedWater Tank GradeLow StyreneCobalt Pre-Accelerated
FORMLiquid pre-accelerated
CATALYSTMEKP 1.5–2%
GEL TIME20–30 min
SHELF LIFE6 months
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↓ Download Datasheet (PDF)

Overview

The resin that holds it together. Tank-grade chemistry.

GRP Polyester Resin is an unsaturated polyester resin pre-accelerated with cobalt octoate, designed for hand lay-up GRP lining of water tanks, swimming pools, and composite structures. Cured at room temperature using MEKP catalyst.

The workhorse resin for water tank lining and GRP repair work. Potable-water grade variants available for drinking-water applications.

Key Features

  • Pre-accelerated – just add MEKP catalyst
  • Hand lay-up compatible
  • Wets out glass fibre fabrics fully
  • Excellent water and chemical resistance
  • Potable-water grade variants
  • Low-styrene formulations available

Technical Specs

Technical Specifications

All values measured at 23°C unless noted. Full test data available in the datasheet.

PropertyValueUnit
FormLiquid pre-accelerated resin–
ColourPale amber–
Density1.10 ± 0.02g/cm³
Viscosity350–450mPa·s
Acid value< 25mg KOH/g
Styrene content35–42%
Catalyst (MEKP)1.5–2%
Gel time at 25°C20–30min
Cure time at 25°C2–4hours
HDT (cured)≥ 65°C
Tensile strength (laminate)≥ 100MPa
Flexural strength (laminate)≥ 150MPa
Packaging20 / 200kg
StandardsBS 4994 · DIN 16946–

Applications

Where this product is used

Six typical site applications where our crews specify this product.

💧

Water tank lining

Internal lining of potable and non-potable water tanks.

🏊

Swimming pools

GRP swimming pool shell construction and lining.

🛢️

Chemical storage

GRP chemical storage tank linings.

🚿

Wet area finishes

GRP wet area sub-strate finishes.

🚢

Marine applications

GRP boat and marine structure lay-up.

🌊

Pond liners

GRP fish pond and water feature liners.

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