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Automotive

Why SMC/BMC in automotive

Buyers expect more frequent model changes, customizations, more choice and more extras. To meet these demands, automotive OEM’s need materials that offer flexibility, design freedom, integration of functions and low weight. Materials like SMC/BMC.

SMC/BMC (Sheet /Bulk Molding Compounds) brings many advantages to truck, agricultural and passenger cars OEMs in part consolidation, corrosion resistance, reduced density and lower capital investment for smaller series runs. High heat stability makes SMC vehicle body parts suitable for on-line painting and its excellent class A surface finish a material of choice for exterior panels such as fenders, tailgates, decklids and spoilers. 

Low weight and design freedom
SMC composite parts will typically be some 20-30% lighter than equivalent steel parts resulting in substantial fuel savings and improved performance efficiencies over the life of the vehicle. Opportunities for further weight savings are being investigated by DSM Composite Resins. Tooling costs for SMC molding are substantially lower than for metal forming which facilitates more frequent model updates, styling differentiations and product offerings. SMC holds no limits for the designer and opens a host of styling possibilities and economical solutions.

Heat Resistance
SMC composites have high levels of thermal stability, which means that, once moulded parts will maintain their dimensional accuracy across temperatures ringing form – 50 C to 200 C. This is why SMC and BMC have long been used for sunroof frames, headlamp reflector shells and engine bay components. Heat resistance is also important for the painting of body panels. Panels are fixid alongside metal parts and painted on-line using normal stoving temperatures. DSM Composite Resins is a recognized leader in the development of the Class A, low profile resin systems that have helped exploit new opportunities for SMC in exterior body panels.

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Example of Palapreg resin based SMC material used in automotive.
- Technical front end Peugeot 407

weight: 3.2 kg
volume: 1600 units/day
drivers: Cost/ Stiffness and Temperature Resistance

Low or high series production
Traditionally SMC has been associated with low and medium series vehicles (<75,000 units per year) but recent applications have proven that volume parts in excess of 300,000 per annum are possible in SMC. Material advances are combined with developments in compression and injection processing, to produce a fully industrialized product that can meet high output – as well as the cost and quality needs – of the volume car market. To be a viable alternative to steel and aluminum SMC needs to meet the highest level of quality and consistency. This is an important area of development focus for DSM Composite Resins 


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