Frequently Asked Questions

What is pitch ?

Pitch is the distance from the middle of one contact target to the middle of an adjacent target.

Targets can be round, rectangular, or any shape. A target can be a PCB pad or a metal lead.

Pariposer fabric is available for pitches from 0.1mm pitch to 1.27mm pitch.

 

Why are there 9 PariPoser thickness options ?

 To get the optimum performance from a Pariposer, the size of the nickel particles used in the magnetically aligned columns has to match the pitch. A smaller pitch requires smaller nickel particles. A bigger pitch uses bigger nickel particles.

The fabric is engineered to have 6-10 columns per target.

How much compression is there in a PariPoser fabric ?

The Pariposer fabric compresses by 30%-50% of its thickness. Since there are currently 9 available thickness options, the compression will range from as little as 0.001”/0.025mm to as much as 0.008”/0.2mm.

Typical compression for a 0.5mm pitch application is 0.002”/0.05mm.

How does the PariPoser compression compare to other elastomers ?

A compression of 30%-50% is typical of most elastomers. Some other conductive elastomers are thicker than a PariPoser fabric, so their overall compression will be greater.

How does the PariPoser fabric compression compare to spring pins ?

Semiconductor spring pins typically compress 0.3-0.5mm. That’s 5X–10X more than the PariPoser fabric.

Spring pins need a good amount of plunger travel to get the right spring force and the right amount of wipe on the metal components. Pariposers do not need the same amount of compression to deliver favorable results. PariPoser fabric makes good contact immediately upon being engaged, and are best used for high-speed applications. Spring pins are best for applications where the surfaces are not very flat, or have looser tolerance controls.

What happens when the PariPoser fabric is compressed ?

When compressed, the elastomer will move like a balloon filled with water. The nickel particles in the columns bend with the elastomer, but do not touch adjacent columns. The uncompressed elastomer will fill in the interstitial voids between the targets.

 

How does the PariPoser fabric compression convert to force per target ?

Each application has its own geometry and its own force calculations. For a typical 0.02”/0.5mm  pitch application and a target diameter of  0.3mm, the force vs. compression curve looks like this:

 

 

What Contact Resistance (CRES) can I expect ?

The ball columns in the PariPoser fabric will conduct current almost immediately at the start of a compression cycle. For 0.5mm pitch fabric, the target CRES will be reached after only 0.001”/0.025mm of compression and will stay at the target value for the full compression length.

At a compression of 30%-50%, CRES is typically 20-30 mΩ.

There are typically 6-10 columns for each target. This current path redundancy  helps keep the CRES low, and allows a high amount of current to pass through the desired location without causing a significant rise in temperature.

 

What kind of durability should I expect from a PariPoser ?

In a clean environment, a PariPoser fabric will cycle 1M+ times, and 10+ years, with no significant degradation of CRES or force.

 

How does the Paricon durability compare to other elastomers ?

Generally speaking: much better.

Paricon fabric contains about 10% metal and 90% elastomer. So, it has very good mechanical durability. Other elastomeric products are 85% metal fibers and only 15% elastomer. This kind of elastomeric contact might take a set and not have good durability.