SMC TECHNOLOGY

SMC – a flexible multi-talent

SMC is a fibre-reinforced, thermoset plastic that is cured under pressure and temperature in a closed mould. Thermoset means that the shape adopted during the curing can no longer be changed by subsequent temperature effects. SMC is composed of reaction resin, glass fibres (length approximately 12 – 50 mm, weight fraction for distribution cabinets approximately 20 – 30%), fillers, colour paste and various additives (e.g. for setting the fire behaviour). Its excellent good mechanical and electrical properties make SMC ideal for use in energy distribution.

Hot pressing – more than just a science

The SMC hot press method is one of the major core competencies of ELSTA Mosdorfer. Our hydraulic presses, with up to 1,000 tons of pressure, process the mat-shaped starting material (SMC) into robust GRP components, with the SMC material being cut and combined into packages in layers. The size and geometry of the moulding determine both the shape of the package and the curing time. Every three to five minutes, an SMC package is placed in the press mould at a temperature of 150°C and is formed and cured with a pressure of up to 100 kg/cm2. The press mould (tool) consists of an upper and lower mould, which are heated electrically or with oil. A hydro-mechanical ejector system is integrated in the moulds, which helps to demould the finished mouldings. The inside of the tools is hardened and polished to achieve the most attractive finish possible on the mouldings and a long tool life. With 1000 or more pieces per year, this method can be used to make thermoset GRP components economically.

The newly developed and unique universal press mould from ELSTA Mosdorfer makes the SMC hot press method interesting even for smaller quantities, because the investment costs for tooling are much lower – so you too can have your components manufactured economically in series quality.