Glass Mat Thermoforming (GMT) Capabilities

Glass Mat Thermoforming (GMT) – High-Strength Molded Parts

Engineered Composites Inc. (ECI) provides cost-effective molding solutions utilizing glass mat thermoforming (GMT) materials. This high-performance thermoplastic composite is ideal for structural parts requiring high strength, stiffness, and structural durability with minimal weight.

Glass Mat Thermoplastic Molding at ECI:

  • Compression molding with presses up to 4,000 tons
  • Custom-forming of preheated GMT sheet stock
  • In-house tooling design and maintenance
  • Robotic trimming and finishing for tight tolerances
  • 3D scanning for quality verification and reverse engineering
  • Secondary operations, including inserts, drilling, and assembly
  • Design for manufacturability support to optimize geometry and material use

The Material Properties of Glass Mat Thermoplastics

GMT combines the structural benefits of long-fiber reinforcement with the processing efficiency and recyclability of thermoplastics, making it a popular alternative to metals in structural applications. The GMT process is especially suited for high-strength molded parts that must support mechanical loads while remaining both lightweight and cost-effective.

  • High stiffness-to-weight ratio
  • Excellent impact resistance and energy absorption
  • Fast molding cycle times for high-volume production
  • Corrosion- and moisture-resistant
  • Recyclable and environmentally friendly
  • Thermoplastic processing flexibility
  • Dimensional stability for consistent, repeatable parts

The Advantages of the GMT Process for Your Products:

Glass mat thermoforming is used to mold high-strength parts across many different industries. An effective metal replacement material, glass mat composites are often used to replace stamped steel, aluminum, or wood in applications where impact resistance, stiffness, and corrosion protection are essential.

Some of the common GMT product possibilities we produce at ECI include:

  • Construction – Lightweight structural panels, formwork supports, and durable composite reinforcements for architectural and structural systems
  • Marine – Non-corrosive interior structural panels, bulkheads, and support ribs for high-moisture environments
  • HVAC – Air duct frames, fan support structures, and vibration-damping bases for rooftop units and industrial systems
  • Aerospace Equipment – Shields, panels, and partitions, passenger compartment components such as seatbacks, trays, and flooring
  • Automotive and Transportation – Load floors, seat backs, spare tire wells, and underbody protection systems, designed to reduce weight without compromising strength

A Leader in Glass Mat Thermoforming Services Since 1994

As a U.S.-based manufacturer, ECI controls the entire GMT production process under one roof, from tooling and engineering to precision forming and product finishing. Our ISO 9001:2015 certified quality control processes ensure precision for every product we deliver.

Whether you’re transitioning from metal to composite or launching a new GMT-based product, ECI is your trusted partner in thermoforming.

Quality Bulk Molded Composite Solutions Since 1994

With over three decades of experience in custom composite molding, Engineered Composites Inc. is your trusted partner for precision BMC components built to meet your exact specifications. From tool development through final machining and assembly, we provide complete, vertically integrated support.