MGS LH 635 Epoxy Hardener

MGS LH 635 is a medium-reactivity epoxy curing agent specifically formulated for use with MGS LR 635 epoxy resin. Designed to deliver an ideal balance between working time and cure speed, LH 635 is widely used in wind energy, marine, transportation, tooling, and industrial composite manufacturing applications.

When combined with LR 635 resin, LH 635 provides excellent laminate quality, outstanding mechanical performance, and reliable processing characteristics for both hand lay-up and vacuum infusion processes. Its moderate reactivity offers sufficient working time for complex laminations while still allowing for efficient production cycles and rapid property development.

LH 635 is engineered to produce durable, high-strength composite structures with excellent fatigue resistance and thermal stability. Following appropriate cure and post-cure schedules, the system can achieve glass transition temperatures approaching 87°C, making it suitable for demanding structural applications.

Flexible Cure Profiles

One of the key advantages of the MGS LR 635 epoxy system is its ability to accommodate a wide range of manufacturing processes through customizable hardener blends. MGS LH 635 can be combined with slower-reacting hardeners such as LH 637 to create intermediate cure speeds and extended working times tailored to specific project requirements.

This flexibility allows fabricators to optimize pot life, gel time, and cure schedules for everything from small repairs and hand laminations to large-scale resin infusion projects. By adjusting the ratio of LH 635 and LH 637, users can achieve a balance between production efficiency and working time while maintaining the exceptional mechanical properties of the finished laminate.

Whether manufacturing large wind turbine components, marine structures, tooling, or complex composite assemblies, the MGS hardener system provides exceptional processing versatility to meet demanding production requirements.

Features & Benefits

• Designed specifically for use with MGS LR 635 epoxy resin

• Balanced cure speed and working time

• Excellent laminate quality and fiber wet-out

• Suitable for hand lay-up, vacuum bagging, and resin infusion

• Ideal for medium to large composite components

• Excellent mechanical strength and fatigue resistance

• Glass transition temperature up to 87°C after appropriate cure

• Compatible with LH 637 hardener for customized pot life and cure profiles

• Allows manufacturers to tailor processing windows for infusion, hand lay-up, and repair applications

• Can be blended with other MGS hardeners to achieve intermediate cure speeds

• Proven performance in structural composite applications

• Widely used in wind energy, marine, tooling, and industrial manufacturing

Typical Applications

• Wind turbine blade manufacturing and repair

• Marine structures and composite boatbuilding

• Composite tooling and molds

• Carbon fiber and fiberglass components

• Industrial composite fabrication

• Structural bonding and reinforcement

• Resin infusion and vacuum-assisted manufacturing

Mixing Ratio

When used with MGS LR 635 resin:

• 100 parts LR 635 Resin

• 30 parts LH 635 Hardener by weight

Accurate mixing and thorough blending are essential to achieve optimal curing performance and final mechanical properties.

MGS LH 635 is the preferred choice for composite manufacturers seeking a versatile epoxy hardener that combines efficient processing, customizable cure schedules, and exceptional structural performance across a wide range of demanding applications.