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Sheet molding compound resins (SMC, LPA)


Intercol offers a sortiment of Low Profile Additives (LPA) for PolyEster Compositesbased on PVAC

We offer a range of polyvinyl acetate homopolymers and copolymers for use as low-profile additives used in polyester resin moulding. These thermoplastic PVAC polymers provide effective control of resin shrinkage during cure, achieving smooth surfaces in SMC and excellent dimensional stability in BMC and pultrusion.

Pultrusion is a high-volume process used for the production of continuous composite profiles such as rods, frames and tubes where dimensional stability and surface finish are important. Low to medium molecular weight PVAc homopolymer grades are used, depending on the exact grade, excellent resin flow and reinforcement wetting can be achieved.

For highly filled bulk moulding compounds (BMC) PVAC solid resins can improve easy compound addition and efficient low-profile properties. BMC for headlamps, electrical junction boxes and other electrical appliances are some typical applications where these LPAs will provide benefits.

Sheet Molding Compound (SMC) 

Sheet Molding Compound (SMC) is a glass-fiber reinforced polyester material used primarily in compression molding. It’s a ready-to-mold material that combines long strands of chopped fiber (usually glass or carbon fibers) with a thermoset resin (typically polyester, vinyl ester, or epoxy resin).

Key Features of SMC:

  • High Strength: The long fibers provide better strength properties compared to standard bulk molding compounds.
  • Versatility: SMC is used in a variety of applications, including automotive panels, electrical components, and corrosion-resistant parts.
  • Cost-Effective: It allows for high-volume production with excellent part reproducibility and low labor requirements.
  • Weight Reduction: SMC can consolidate multiple parts into one, reducing weight and material usage.
Low Profile Additive for SMC applications - Intercol

Production Process:

  1. Resin Paste Application: A measured amount of resin paste is applied to a plastic carrier film.
  2. Fiber Addition: Chopped fibers are cut and dispersed onto the resin paste.
  3. Sheet Formation: Another sheet is added on top, sandwiching the fibers between the resin layers.
  4. Compaction: The sheets are compacted and rolled for storage.
  5. Molding: The material is cut into charges, placed in a mold, and subjected to heat and pressure to cure into the final product

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