Sheet moulding compound (SMC)

BFG International uses a variety of methods to produce FRP parts. Our experienced engineers will select the best method for your project based on factors such as production volume, parts dimensions, budget, and other requirements.

Sheet moulding compound (SMC)

Our extensive experience with press moulding enables us to produce innovative and cost-effective parts for our OEM customers.

The process is best suited for large structurally reinforced parts requiring two-sided finish. It is best for moderate to high production quantities of between 5,000 and 10,000 parts per year.


Sheet moulding compound (SMC) is both a process and reinforced composite material. The composite is a “ready to mould” glass or carbon fibre reinforced polyester material primarily used in compression moulding. The SMC sheets are manufactured in a continuous in-line process by dispersing long strands of chopped glass fibres or carbon fibres on a bath of polyester resin, vinyl ester resin or epoxy resin. It is a flexible, leather-like sheet that is easily cut, weighed and placed in the mould for curing to the desired part configuration.

SMC materials are thermosets and contain glass or carbon reinforcement levels between 10 and 60 percent. The longer fibres in SMC result in better strength properties than standard bulk moulding compound (BMC) products. Standard SMC contains up to 35 percent of randomly oriented fibres by weight. Because there is no mixing or extruding involved in preparing sheet moulding compound, the fibres remain undamaged and at their original lengths. This plus the higher fibre loading provides very good mechanical properties in compression-moulded SMC parts, especially those having relatively thin cross sections.

Materials options

Resins: Polyester, Vinyl Ester, Epoxy Resin

Fibres: Any

Cores: Balsa, Foam


  • SMC delivers high surface quality with excellent detail, including ribs, bosses, inserts
  • SMC is used for larger parts where higher mechanical strength is needed
  • SMC parts display excellent temperature and fire resistance
  • Piece parts are cost effective solutions for structural and non-structural applications
  • SMC Structures have long life and require little maintenance.


  • Because SMC flows in the mould, fibre orientation and properties can vary throughout a part, particularly in deep-drawn shapes


  • Demanding electrical applications
  • Corrosion resistant needs
  • Structural components at low cost, automotive, and transit
  • Class A body panels
  • business equipment cabinets
  • personal watercraft
  • structural components
General Design Guidelines
Minimum Radius1 mm (0.0625 in)
Minimum Draft4 degrees
Minimum Thickness3 mm (0.125 in)
Maximum Thickness 13 mm (0.500 in)
Typical Reinforcement Loading10 – 60 %
Density (GP resin)1938 kg/m3 (.070 lb./in3)
Die Lock (Reverse Draft)Yes
Contact us to discuss your project with one of our experts in the field.