see also
Pultruded Profiles
Grating / Safety Foor
Coverings GRFP
Moulded Pieces
» Manual Moulding
» Infusion

VARTM (vacuum assisted resin transfer moulding) process, is indicated for series over 50 units. The piece manufactory consists on putting dried glassfiber inside the mould which is closed against another mould, also made of glassfiber, where injected low pressure resin and is vacuum assisted. This process allows obtaining regular pieces on both sides and a good finishing. The piece’s thickness and weight are very similar for each produced piece. The cost of this mould is superior to the manual moulding process, but the obtained quality of the piece is a lot superior.

The glassfiber mass percentage in this kind of piece is inferior to 30% of the piece weight.

A good part of the exterior panels of “Metro do Porto” (Oporto’s Metropolitan) were manufactured by this process, Alto was pioneer on the introduction of this process in Portugal.

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