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Amphenol has developed a P-clamp for mission-critical cable harnesses, using Victrex PEEK polymer.

The clamps adhere to the same mechanical design as Amphenol’s original high-performance P-clamps, but instead use a softer durometer silicone rubber for the clamp cushioning.

Called the LDG P-clamp, the product was designed to reduce wear and tear on mission-critical transmission lines (RF, fibre optics) and is currently in use in a major aerospace programme.

‘For these types of cable harnesses, using a softer cushioning together with Victrex PEEK polymer helps improve the overall performance and extends the lifetime of the new clamp when compared with traditional clamping devices,’ said Tony Padula, product manager at Amphenol.

‘We chose this high-temperature-performance thermoplastic for its corrosion resistance, excellent mechanical and electrical properties, and high-temperature performance,’ he added.

Victrex PEEK polymer is strong, inert, inherently flame retardant and can be easily fabricated into tight-tolerance parts.

Amphenol chose to use a softer durometer silicone rubber for the LDG P-clamp because the durometer value of a traditional P-clamp is too hard for sensitive cables.

The LDG P-clamp uses a soft but durable silicone rubber that is used in a range of aerospace, shipboard and industrial applications.

Traditional P-clamps usually force wires and/or cables into one another, applying a very uneven force that can potentially cause serious damage and degrade electrical performance and/or impedance.

The soft nature of the low-durometer rubber, coupled with the ease-of-use mechanical design, works to solve the problem by acting like a cushion around the cables.

It limits the amount of wire chaffing or pinching, thereby limiting wear and tear on the harnesses.

This becomes especially important when dealing with high-performance coaxial, RF, fibre optics and/or microwave cables – cables that can be fragile and break during initial installation.

Once installed, the low-durometer rubber helps to ensure that no interruptions in data or signal transfer will take place.

The procedure requires no adhesive and the result is a secure, cohesive bond each and every time The rubber will not come off the plastic, protecting against strong surges and vibration, and sealing the silicone rubber cushion to the plastic.

The LDG clamps are equipped with hinged locking features designed to make installation quick and easy.

A lock-open feature keeps the clamp open and a second lock-closed feature keeps the clamp closed.

This frees up an installer’s hand, making it easier to do his or her job.

‘Testing shows that the LDG P-clamps can reduce assembly time by 30 per cent when compared with traditional clamping devices on the market,’ added Padula.

‘The design reduces the likelihood that an assembly will be damaged during installation,’ he said.

Available in single-leg (P-clamp) configuration, the LDG clamps are available in 17 sizes, allowing them to meet most wire bundle and application-specific load requirements.

They are compatible with tubing up to 2in in diameter.

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