Form in Place

Form in Place is a dispensable conductive silicone for intricate and small diameter conductive seals. It is applied directly to the substrate by means of robotic dispensing for repeatable and accurate results.

Applications

Our dispensed Form-In-Place (FIP) EMI shielding gaskets provide the lowest total cost of ownership for small cross section and complex pattern applications. Parker Chomerics Cho-Form (conductive) and ParPHorm (non-conductive) FIP materials can reduce installed cost of an EMI gasket by up to 60%.

Applications include:

  • Where an EMI gasket is needed on a narrow flange

  • ManPack applications where weight saving is critical

  • Handheld electronic devices

  • Automotive electronic components

  • Aerospace and UAV electronics

  • Where a limited deflection force is achievable, highly compressible

Products

Cho-Form (conductive) & ParPHorm (non-conductive)

Frequently Asked Questions 

What are the general deflection/compression details for Form in Place?

Minimum: 10%, maximum: 50%, nominal: 25% - 30% (in between this range is where you need to aim for).

What Form in Place design considerations would you recommend?

Design a groove for the FIP to go in, this will act as a compression stop. The aid of hard compression stops on the bolts (as raised towers) will resolve concerns of FIP being used as a one-time use, so that you can take the lid on/off. The groove and compression stops can possibly resolve some form of compression set which will incur in the use of the FIP gasketing. FIP are usually around 30 to 40 shore hardness and typically used where there is a need for low force compression to achieve metal-to-metal contact required on the metalwork.

Do metal plates need a groove for a FIP bead?

A gasket groove (simple U channel groove) in the metal work is preferred as it may offer longevity of the gasket bead. However, we are able to facilitate no groove in the metal work or etched metal.

Do you have any design considerations for FIP beads?

Preferably, each side of the gasket should have some space for tolerances. Approximately 0.2-0.3mm on each side is recommended to get a good quality gasket. This also depends on the quality of metal chassis, or if the alignment areas are accurate in position compared to the gasket walls. Please see Gasket Design Considerations for more information.

What are the maximum and minimum FIP bead sizes you are able to dispense?

The recommendation for height limitations is to try designing the gasket 0.8mm or higher. There is no maximum level, but our highest gasket so far was 1.6mm. Higher is possible with bead on bead to get the desirable height. However, this may result in higher costs due to higher material consumption. Normal FIP gasket bead height is 0.8mm or 1mm.

HITEK Electronic Materials Ltd

15 Wentworth Road, South Park Industrial Estate, Scunthorpe, DN17 2AX North Lincolnshire, United Kingdom

Phone Number: +44 (0)1724 851678    Email Address: sales@hitek-ltd.co.uk

Company Number: 01926845     VAT Number: GB365016468     EORI Number: GB365016468000

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