Wind Turbine Blade Hand Lay-up Epoxy Resin

Model 725-EP3001A&725-EP3001B

Category Advanced Resins

725-EP3001A&725-EP3001B Hand Lay-up Epoxy Resin Produce Description 725-EP3001A&725-EP3001B epoxy resin is composed of two components, among which 725-EP3001A is the epoxy resin component and 725-EP3001B is the hardener. It has the characteristics of low viscosity, long operation time, low exothermic peak, good wettability, good mechanical properties and fatigue properties, and is suitable for the preparation of various fiber reinforced composites. The resin can meet the performance requiremen

Product Description

725-EP3001A&725-EP3001B is a two-component high-performance epoxy resin system developed for hand lay-up manufacturing of wind turbine blades and fiber reinforced composite components.

The system consists of 725-EP3001A epoxy resin component and 725-EP3001B curing agent, providing excellent processing characteristics and reliable cured performance for composite applications.

With its low viscosity, long operation time, excellent fiber wetting capability, low exothermic peak temperature, and superior mechanical properties, this epoxy resin system enables efficient manual composite fabrication while maintaining consistent laminate quality.

The product is designed to meet the performance requirements of German Classification Society standards for wind turbine blade manufacturing, making it suitable for structural composite components requiring good fatigue resistance and long-term durability.

Product Advantages

Excellent Hand Lay-up Processing Performance

The resin system provides optimized viscosity and good flow characteristics, allowing easy manual application and efficient impregnation of reinforcement fibers.

It is suitable for composite manufacturing processes requiring accurate resin distribution and smooth laminate formation.

Low Viscosity and Excellent Fiber Wettability

The mixed viscosity is only 300-600 cP at 25℃, allowing the resin to penetrate fiber reinforcement effectively and improve composite quality.

Long Working Time

With a pot life of ≥2 hours at 25℃, the system provides sufficient operation time for manual lay-up production of large composite components.

Controlled Exothermic Reaction

The maximum exothermic peak temperature is controlled at ≤100℃, reducing thermal stress during curing and improving production safety.

High Mechanical and Fatigue Performance

After curing, the resin provides:

High tensile strength
Excellent flexural strength
High modulus
Good fatigue resistance
Low water absorption

making it suitable for long-term outdoor composite applications.

Applications

725-EP3001A&725-EP3001B hand lay-up epoxy resin is widely used in:

Wind Energy Applications

Wind turbine blades
Blade repair composites
Engine room covers
Blade fairings
Composite reinforcement structures

Composite Manufacturing

Glass fiber reinforced composites
Fiber reinforced plastic (FRP) components
Manual lay-up composite products

Other Industries

Sports equipment
Lightweight composite structures
Industrial composite parts

Technical Properties

Component A: 725-EP3001A Epoxy Resin

Property	Unit	Value
Appearance	-	Colorless transparent syrupy liquid
Viscosity (25℃)	cP	2000-3000
Density (25℃)	g/ml	1.1-1.2
EEW	g/eq	165-185
Storage Life	Month	12

Component B: 725-EP3001B Hardener

Property	Unit	Value
Appearance	-	Blue clear liquid
Viscosity (25℃)	cP	15-55
Density (25℃)	g/ml	0.94-1.1
Amine Value	mgKOH/g	400-550
Storage Life	Month	12

Mixed Resin Properties

Mixing Ratio: 725-EP3001A : 725-EP3001B = 100 : 34 ±2

Property	Unit	Value
Mixed Viscosity (25℃)	cP	300-600
Density	g/ml	1.1-1.2
Pot Life (25℃)	h	≥2
Exothermic Peak Temperature	℃	≤100

Cured Resin Performance

Curing Condition: 10h @70℃

Property	Unit	Value
Density	g/cm³	1.1-1.2
Tg (Teig)	℃	≥65
Tg (Tmg)	℃	≥70
Tensile Strength	MPa	≥60
Tensile Modulus	MPa	≥2700
Fracture Elongation	%	≥2.5
Flexural Strength	MPa	≥100
Flexural Modulus	MPa	≥2700
Volumetric Shrinkage	%	≤5
Water Absorption	%	≤0.5
HDT	℃	≥65

Processing Guidelines

Mixing Ratio

Recommended ratio:

725-EP3001A : 725-EP3001B = 100 : 34 ±2 (by weight)

Mixing Method

To achieve optimal performance:

Accurately weigh epoxy resin and curing agent.
Mix thoroughly for at least 2 minutes.
Ensure complete mixing of material from container walls and bottom.
For mechanical mixing equipment, regularly monitor the mixing ratio.

Recommended Processing Conditions

Recommended working temperature:

20℃-30℃

Recommended humidity:

Below 70%

Recommended curing temperature:

50℃-80℃

The curing process can be adjusted according to:

Component size
Temperature conditions
Production requirements
Heating schedule

Storage and Packaging

Packaging

725-EP3001A Epoxy Resin

220 kg sealed drum

725-EP3001B Hardener

200 kg sealed drum

Storage Conditions

Storage temperature: 10℃-40℃
Keep containers tightly sealed
Store in dry conditions
Avoid moisture contamination

The curing agent is hygroscopic and may absorb moisture and carbon dioxide from the atmosphere. Proper sealing after opening is required to maintain chemical stability and final product performance.

FAQ

1. What is hand lay-up epoxy resin?

Hand lay-up epoxy resin is a composite resin system applied manually with reinforcement fibers to manufacture fiber reinforced composite structures.

2. Is this epoxy resin suitable for wind turbine blades?

Yes. 725-EP3001A&725-EP3001B is designed for wind turbine blade composite manufacturing and meets performance requirements for blade paste applications.