The principle of this technique is to inject a binder (unsaturated polyester resin) into a closed mold. RTM technology covers a variety of applications, which are:

Injection is classic RTM. Principle Resin impregnates the material between the die and a solid heavy punch under high pressure. The matrix and punch are firmly pulled together.

Vacuum Assisted Injection – LRTM. PRINCIPLE The resin impregnates the material under low pressure and vacuum created between the die and the light punch.

Pressing by impregnation in vacuum or in air – cold pressing. Forming techniques using rigid substrates and stamping machines.

What technology to choose?

Unlike manual molding, these techniques use punches in the tool – a reverse matrix in which the resin channels and seals are located. For different injection methods, the design and manufacture of punches have specific characteristics. For rigid punches we can get two viewing surfaces by gel coating the die and punch.

In order to achieve the best results in terms of product quality, impregnation speed, special materials must be used.

Resin – Must be low viscosity 100 – 250 cp at 23°C Brookfield. We offer a complete range of resins for injection molding technology with different properties.

The glass material must be stitched and have a resin conductive layer. Typically, polypropylene or continuous glass mat is used as such layer. We offer a wide range series of RTM rein flow products.

-It is a composite material consisting of a polypropylene synthetic non-woven core and a glass mat stitched together.

-The outside is a composite rein flow layer made of polypropylene.

-Combination of RTM mat with polyester surface veil stitching.

-Combination RTM flow mat material with multiaxial fabric stitching.

– A composite material consisting of two glass surface mats and a core layer – polypropylene + glass material (50/50).

Here is the RTM Flow Mat Specification List: