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Documentation - Molded Grating - Resins

Resins

Resin used in Fiberr molded fiberglass reinforced plastic grating

Resin System Overview

Fiberr USA offers molded grating in two resin systems: isophthalic polyester (ISO) and vinyl ester (VE). The appropriate resin depends on the chemical environment, mechanical-performance requirements, operating temperature, required service life, and budget.

Resin forms the continuous matrix surrounding the glass-fiber reinforcement. It provides corrosion resistance, transfers loads between the reinforcing fibers, protects the fibers from environmental exposure, and influences the finished grating’s durability, thermal performance, toughness, and resistance to chemical attack.

Available Resin Systems

Isophthalic Polyester (ISO)

A thermosetting polyester resin based on isophthalic acid. ISO resin provides good corrosion resistance, mechanical strength, and durability in general industrial applications. It is widely used where moderate chemical exposure and cost efficiency are priorities.

Vinyl Ester (VE)

A thermosetting resin produced by the esterification of an epoxy resin with methacrylic or acrylic acid. VE resin offers superior chemical resistance, toughness, and resistance to stress cracking. It is recommended for environments involving strong acids, solvents, elevated temperatures, or prolonged exposure to aggressive chemicals.

Resin Selection Matrix

Table 10: Resin Selection Matrix

Factor Isophthalic Polyester (ISO) Vinyl Ester (VE)
Chemical Name Isophthalic Polyester Epoxy-Based Vinyl Ester
Relative Cost Baseline Approximately 35% higher than ISO
General Chemical Resistance Good Excellent
Resistance to Acids and Solvents Moderate High
Mechanical Strength High Very High
Thermal Resistance Suitable up to approximately 80°C (176°F) Suitable up to approximately 105°C (221°F)
UV Resistance Good with additives Excellent with additives
Best Use Cases General industrial flooring, walkways, access platforms, and municipal projects Chemical-processing plants, wastewater treatment, offshore facilities, and heavily corrosive industrial environments

Selection Guidance

  1. Select ISO when cost efficiency is a primary consideration and the operating environment involves only moderate chemical exposure.
  2. Select VE when the application requires maximum chemical resistance, higher thermal performance, improved resistance to stress cracking, or extended service life in harsh industrial, wastewater, offshore, or marine environments.

Resin selection should be verified against the specific chemicals, concentrations, temperatures, exposure duration, and operating conditions of the application. See the Molded Grating Chemical Resistance Guide for additional application guidance.

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