Process	Matrix injection - RTM
	Matrix injection, also called resin transfer moulding, produces strong fibre reinforced parts of thermosetting plastics with smooth surfaces on both sides. Mats of reinforcement material are placed in a mould which is then closed. Plastic is injected into the mould. After hardening the finished part can be removed from the mould. The process is used where advanced geometry is required, and for car parts. The cycle time per part is medium, and small to medium series can be produced.
Danish Name	Matrixinjicering
Category	Mass conserving processes, Shaping plastics
Materials	Most used: Glass reinforced resins Possible: Aramid reinforced epoxy Carbon reinforced epoxy
Typical products	Car bonnet Flywheel Soda stream pressure container
References	Risų, Department of Material Research EM-fiberglas A/S Jupiter Plast A/S Techno Fiber
Price notes	Compared to injection moulding the cost of the production equipment is relatively low since injection is carried out at moderate pressure and temperature.
Environmen- tal notes	Working environment problems in handling epoxies is minimised thanks to the use of injection into a closed mould.
Photo	Thomas Nissen (Computer graphics)
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