LRTM (Light Resin Transfer Molding)
Closed-mold process in which resin is injected between a mold and a counter-mold. This method stands out for its high production rate, consistent part thickness, and ability to deliver an excellent surface finish on both sides of the part.
LRTM Process
The Steps
Gelcoat Application
Liquid gelcoat is sprayed into the mold and counter-mold
Fiber Layer Placement
Fiber layers are placed in the mold and counter-mold to form the future part
Mold and Counter-Mold Closure
The mold and counter-mold are assembled to create the cavity of the future part
Resin Injection
Resin is injected into the assembled mold and counter-mold to create the part
Resin Curing
A chemical reaction converts the resin from a liquid to a solid state
Part Demolding
6. The finished part is removed from the mold
Process Comparison Table
| Contact Molding | Infusion | LRTM | RSB | |
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| Mechanical properties |  |
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| Consistent part thickness |  |
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| Lightweight design potential |  |
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| Environmental footprint |  |
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| Material costs |  |
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