Sink Marks–Technical Problem of Fiberglass Compression Molding

Condition Description Reasons Solution
1 The depressed deformation on the surface,ribs,raised part and/or the back side(shiny or dark). uneven shrinkage during molding. use low or no shrinkage resin in formulation for sheet molding compound(SMC)
2 increase the temperature of Cavity or Core and to bring the temperature difference between Cavity and Core to 5–6.
3 increase the pressure and shorten the length of glass fiber.
4 improve the mold design,change the feed position.
5 narrow the gap between core and cavity of fiberglass mold.
Project:
Internal cracking–Technical Problem of Fiberglass Compression Molding

Condition Description Reasons Solution Condition Internal Cracking Due to excessive shr……

Main raw materials of Polyester Molding Fiberglass

Polyester Molding Fiberglass (hereinafter referred to as SMC / BMC) are mainly composed of unsatur……

Many small surface holes–Technical Problem of Fiberglass Compression Molding

Condition Description Reasons Solution 1 if there are too many small holes in the surface it ……

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