GRP Mould Clamp Procedure

This is the procedure for constructing a GRP Composite multipiece mould, imbedding the GRP Mould Clamps in the flanges. Allowing for perfect alignment when assembling the finished parts of the mould

  • Mould Clamp Construction Procedure Step 1

  • Align the FEMALE clamp on the parting flange, allowing enough space to mould around between the pattern and the clamp, suggested dimensions, diagram shown for M8 Size From edge of flange to the mould clamp centre:

    M6: 25mm

    M8: 35mm

    M12: 45mm

    Distance apart

    M6: 100mm

    M8: 150 - 200mm

    M12: 200mm - 250mm.

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  • Mould Clamp Construction Procedure Step 2

  • Attach the FEMALE clamps to the parting flange, with screws inserted into the specially designed screw head protectors

    Screw Part No: 2006 for M6

    Screw Part No: 2008 for M8

    Screw Part No: 2012 for M12

    Cap Part No: 3006 for M6

    Cap Part No: 3008 for M8

    Cap Part No: 3012 for M12

    This is to aid removal of the screws when complete and prevent resin trapping the screw.

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  • Mould Clamp Construction Procedure Step 3

  • Continue to Lay-up the first part of the Mould.

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  • Mould Clamp Construction Procedure Step 4

  • Remove the screws attaching the Mould Clamps to the parting flange, then remove the parting flange. Once the parting flange is removed the Female GRP Mould Clamps are now visibly moulded into the flange of the mould. Prepare the pattern and newly made GRP Flange with release agent.

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  • Mould Clamp Construction Procedure Step 5

  • Attach the MALE GRP Mould Clamp with the set screw.


    Set Screw Part No: 4006 for M6
    Set Screw Part No: 4008 for M8
    Set Screw Part No: 4012 for M12


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  • Mould Clamp Construction Procedure Step 6

  • To protect the set screw from resin and gelcoat during the next stage push fit the set screw cap:

    Part No: 5006 for M6,

    Part No: 5008 for M8

    Part No: 5012 for M12.

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  • Mould Clamp Construction Procedure Step 7

  • Once the mould is complete the set screw cap and set screw are removed and the mould can be released from the pattern and prepared for production.

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  • Mould Clamp Assembled Mould Cross Section

  • The end result is a perfectly aligned split mould with minimal flashing that can be removed with a small air driven or electric buffer.

  • Mould Clamp Unassembled Mould Cross Section
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