This document discusses resin transfer molding (RTM), which is a manufacturing process for composites. It involves injecting resin into a closed mold containing reinforcing fibers. RTM was originally developed for boat manufacturing in 1946. Common resins used include epoxy, polyester, and vinyl ester. Glass, carbon, and natural fibers are often used as reinforcements. The resin is injected into the mold containing the fibers, where it impregnates the fibers and hardens to form a composite part with good surface quality and complex shapes. Applications include truck panels, boat hulls, wind turbine blades, and various other industrial and consumer products.

1. RESIN
TRANSFER
MOLDING
Submitted By:-Pankaj Kumar Das
Roll NO :-1308023
B.Tech Polymer Science (2nd year)

2. CONTENT
 History
 Material Used
 RTM SET UP
 Working Procedure
 Advantage & Disadvantage
 Application
 Reference

3. HISTORY
 Developed by a US navy contract for the development of 28-ft long
personal boat in 1946 .
 Fully developed for general aerospace applications in the 1980s.

4. MATERIAL USED
 Matrix:-
Epoxy, Methyl Methacrylate, polyester, polyvinyl ester, phenolic
resin.
 desired resin characteristics
 must remain liquid as it is held in the reservoir prior to
injection.
 must impregnate fiber preform quickly and uniformly without
voids.
 must gel as quickly as possible once impregnation occurs
(fast cycle time).
 must possess sufficient hardness to be demolded without
distortion.

5.  Reinforcement:-
 Glass fiber, carbon fiber, aramid fiber, natural plant fibers (sisal,
banana, nettle, hemp, flax etc.)
 These fibers are used either individually or in combined form as
a woven.
 mat, unidirectional mat or chopped strand mat.
 Mineral fillers may also be added to improve surface finish and
fire retardancy.

6. RTM SET-UP

7. WORKING PROCEDURE

8. ADVANTAGE
 Good surface quality
 Wide range of reinforcements
 Large, complex shapes
 Low capital investment
 Less material wastage
 Tooling flexibility
 Low environmental impact
 Labor savings
 Zero air entrapment within the product.

9. DISADVANTAGE
 Mold cavity limits the size of the composite.
 High tooling cost.
 There is limitation on reinforcing materials due to
the flow and resin saturation of fibers.

10. APPLICATION
 Truck panels
 Boat hulls
 Wind turbine blades
 Aerospace and automobile parts
 Medical composites
 Bathroom fixtures, car body, helmet, etc.

11. REFERENCE
 Google Image
 Wikipedia
 http://www.moldedfiberglass.com/processes/processes/closed
-molding-processes/resin-transfer-molding