Quick guide to finishing options

The choice of finishing depends on the shape of the application, manufacturing process and the main objective, which may be to minimize weight of the final product, reduce the cost of production or obtain a certain finish.

Finishing options affecting form

 

Grid-score
Many composite applications have a complex shape, and grid-scored material is commonly used to make the core material conform easily to the mold.

Grid-scored materials contain a cut pattern on one side of the core – both lengthwise and crosswise – creating small blocks. The blocks are held together by a lightweight fiberglass scrim, creating a very flexible core sheet.

Most widely used:

GSC10
GSC10 is a material grid-scored in two directions, which makes it flexible for use in curved geometries. It is mostly used in thin sandwich constructions where an adaptable core is appreciated.

Download datasheet

GSC30
GSC30 is a grid-scored material, with 30mm between each cut, which makes it formable and flexible for use in various applications.

 

Download datasheet

 

Other options for special needs:
GSC60
GSWC30
SCWC


Double contour

Most widely used:

DCC30
DCC30 is grid-scored in two directions on both sides of the core, the cuts opposing each other at an offset of 50%. Where the grids intersect perforations are created.

Download datasheet


Other options for special needs:
DCWC30
ODC30


Finishing options affecting resin distribution

 

Perforations
Perforations are small holes drilled in plain sheet materials. During lamination, they allow air to escape from behind the core material. Perforations also enable better resin flow.

PFC
PFC material is designed to release trapped air from under the core and or allow resin to flow from one side of the core to the other.

 

Download datasheet

PFC20
A perforated material, with a c-c of 20mm between perforations, commonly used in prepreg, vacuum bagging and infusion operations.

 

Download datasheet


Grooves
Grooves are narrow, shallow channels cut into the face of the core to eliminate the risk for entrapped air, increase resin flow and improve bond strength of the laminate to the core.

To enable a proper resin distribution and wet out, different patterns and dimensions of core grooves are used. Choice of pattern and groove dimension depend on the needs of weight reduction, laminate thickness, fill times etc.

Most widely used:

GRC6
Thin grooves in one direction on both sides of the core, thus enabling a proper wet out and flow in resin transfer processes.

Download datasheet


Other options for special needs:
GRC4


Grooves and perforations

Most widely used:

GPC1
GPC1 is an attribute to our core materials, developed to make the infusion process reliable, fast and robust on flat or slightly curved surfaces, while imprints on the surface are minimized.

Download datasheet

GPC6
A finishing consisting of perforations and one-directional grooves, which makes it a fast, robust and reliable distribution medium in closed molding processes.

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GPL1
GPL1 is a development from its precursor GPC1, with further optimization of grooves and perforations to minimize resin consumption and achieve further weight savings.This optimization results in a slower flow and precautions must be taken to laminate thickness, intended for high-tech applications.

Download datasheet

 

Other options for special needs:
GPC2
GPC5 & GPC7
GPC8

 

Finishing options affecting both resin consumption and form

 

Often, both the geometry and the molding process are advanced. That is when the below combinations of finishes are suitable. The final choice of finishing is determined by various criteria, i.e. demands on surface finish, cycle time, type of manufacturing process, weight etc.

Most widely used:

GSC30/GPC1
Allows a very fast and robust resin flow in closed molding applications where there are curved geometries. GSC30/GPC1 provides a secure wet-out on both sides of the core, while it still provides one surface with good surface finish.

Download datasheet

GSC30/GRV2
Commonly used in closed molding process were the application needs a good surface finish and the surfaces are curved.

Download datasheet


Other options for special needs:
GRS1
GCS60/GPC5
GSC60/GPC1


For more information about finishing, download our Finishing Guide, which is part of the Diab Knowledge Series.

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