Fibre Glast Teams up with Gurit - Ampreg 30 and Ampreg 31 Epoxy Systems

September 10, 2026 By Fibre Glast Technical Team

Fibre Glast has teamed up with Gurit to add two epoxy wet laminating systems for manufacturing and repairing large composite structures: Ampreg 30 Low-Viscosity Epoxy Wet Laminating Resin and Ampreg 31 Epoxy Wet Laminating Resin.

Both systems are designed for hand layup and vacuum bagging, making them relevant to wind turbine blade repair crews, composite manufacturers, and other professionals working with large laminates. Although they share several important characteristics, each offers distinct processing advantages.

What Are Ampreg 30 and Ampreg 31?

Ampreg 30 and Ampreg 31 are epoxy wet laminating systems developed for large composite structures. Both systems offer:

Compatibility with hand layup and vacuum bagging processes
Strong laminate mechanical and thermal properties
Ambient-temperature curing with improved performance available through post-curing
Multiple hardener speeds for different working-time requirements
A consistent resin-to-hardener mix ratio across the standard Ampreg 3X hardener range
Bio-based carbon content
Gurit Light Reflective Technology
Lloyd’s Register and DNV certification

For wind turbine blade repair applications, the choice between Ampreg 30 and Ampreg 31 primarily depends on the reinforcement, laminate orientation, repair geometry, processing conditions, and approved repair procedure.

Ampreg 30: Low Viscosity for Easier Reinforcement Wet-Out

Ampreg 30 Low-Viscosity Epoxy Wet Laminating Resin is formulated with a relatively low initial mixed viscosity. This promotes efficient wet-out of heavyweight reinforcements and helps the resin move through dense or substantial fabric constructions.

These characteristics make Ampreg 30 particularly useful when technicians need a laminating resin that can thoroughly wet heavier fiberglass or other reinforcement materials used in large composite structures.

Key Ampreg 30 Features

Low initial mixed viscosity
Easy wet-out of heavyweight reinforcements
Designed for hand layup and vacuum bagging
Good cure progression from ambient-temperature cures
Tough resin matrix with strong laminate properties
Up to 34% bio-based carbon content in the resin
Tested in high-humidity environments
Available with multiple hardener speeds

Shop Ampreg 30 Low-Viscosity Epoxy Wet Laminating Resin

Ampreg 31: Balanced Wet-Out and Drainage Resistance

Ampreg 31 Epoxy Wet Laminating Resin balances effective fabric wet-out with increased resistance to resin drainage. This is particularly valuable when laminating vertical or steeply oriented surfaces, where excessive resin movement can make it more difficult to maintain a consistent laminate.

Wind turbine blade repair technicians frequently work on curved, vertical, overhead, or otherwise challenging surfaces. Ampreg 31’s balance of wet-out and drainage resistance can provide greater control during these applications.

Key Ampreg 31 Features

Viscosity optimized for fabric wet-out
Good drainage resistance on vertical surfaces
Designed for hand layup and vacuum bagging
Strong mechanical and thermal properties
Tough resin matrix
Up to 32% bio-based carbon content in the resin
Tested in high-humidity environments
Available with multiple hardener speeds

Shop Ampreg 31 Epoxy Wet Laminating Resin

Ampreg 30 vs. Ampreg 31: Which Should You Choose?

The central difference between the two systems is their processing viscosity.

Choose Ampreg 30 when low viscosity and easy wet-out of heavyweight reinforcement are the primary considerations.

Choose Ampreg 31 when the repair requires effective fabric wet-out with greater resistance to resin drainage, particularly on vertical or angled surfaces.

Consideration	Ampreg 30	Ampreg 31
Primary processing advantage	Low initial mixed viscosity	Balanced wet-out and drainage resistance
Reinforcement wet-out	Especially suited to heavyweight reinforcements	Good general fabric wet-out
Vertical-surface application	May flow more readily because of its lower viscosity	Better suited when drainage control is important
Application methods	Hand layup and vacuum bagging	Hand layup and vacuum bagging
Standard mix ratio by weight	100:26	100:26
Bio-based carbon content	Up to 34%	Up to 32%
Certification	Lloyd’s Register and DNV	Lloyd’s Register and DNV

Product selection should always follow the applicable blade manufacturer’s repair instructions, engineering requirements, and approved material specifications.

Multiple Hardener Speeds for Different Working Conditions

Both epoxy systems can be paired with compatible Ampreg hardeners offering different working and cure times. This allows users to select a hardener based on factors such as:

Repair size and laminate thickness
Ambient temperature
Required working time
Crew size and application method
Vacuum-bagging schedule
Planned cure or post-cure conditions

Accurate measurement and thorough mixing are essential. Always consult the product technical data and safety data before beginning a repair.

Light Reflective Technology Supports Better Work-Site Hygiene

Ampreg 30 and Ampreg 31 incorporate Gurit Light Reflective Technology. When exposed to a suitable UV light source, uncured resin contamination fluoresces, helping technicians identify small droplets or areas of contamination during cleanup.

This technology can support post-work inspection and better industrial hygiene by making uncured epoxy easier to detect before it is transferred beyond the immediate work area. It does not replace proper personal protective equipment, handling procedures, or workplace safety practices.

Epoxy Systems for Professional Wind Turbine Blade Repair

Wind turbine blades are exposed to rain, hail, ultraviolet radiation, temperature changes, airborne debris, and continuous cyclic loading. Effective repairs require composite materials selected for the blade design, damaged area, approved repair procedure, and operating environment.

The addition of Ampreg 30 and Ampreg 31 expands Fibre Glast’s selection of professional wind turbine blade repair materials, including reinforcement fabrics, epoxy systems, adhesives, core materials, vacuum bagging supplies, fillers, fairing compounds, and repair consumables.

Fibre Glast has supplied first-quality composite materials for almost 70 years. Most in-stock products ordered by 2:30 p.m. ET ship the same business day, helping maintenance teams keep scheduled and time-sensitive repair projects moving.

Frequently Asked Questions

Are Ampreg 30 and Ampreg 31 suitable for wind turbine blade repair?

Both systems are designed for hand layup and vacuum bagging of large composite structures and may be suitable for wind turbine blade repair when permitted by the applicable OEM procedure, engineering specification, or approved repair plan.

What is the main difference between Ampreg 30 and Ampreg 31?

Ampreg 30 has a lower initial mixed viscosity designed to promote easy wet-out of heavyweight reinforcement. Ampreg 31 combines good fabric wet-out with greater drainage resistance for vertical and angled surfaces.

Can these epoxy systems be vacuum bagged?

Yes. Ampreg 30 and Ampreg 31 are designed for both hand layup and vacuum bagging processes.

Do Ampreg 30 and Ampreg 31 cure at ambient temperature?

Both systems can develop good mechanical properties through an ambient-temperature cure. A controlled elevated-temperature post-cure can improve their mechanical and thermal performance. Follow the appropriate technical data sheet for required cure conditions.

Do both systems use the same mix ratio?

With the standard Ampreg 3X Fast, Standard, Slow, and Extra-Slow hardeners, both systems use a 100:26 resin-to-hardener mix ratio by weight. Specialty hardeners may require a different ratio, so always verify the instructions for the exact combination being used.