[sdiy] Carbon foam, the revenge

[Andre Majorel]

On 2008-05-07 01:14 +0200, Andre Majorel wrote:

> So there is foam and foam. Most types hold up well but some try to
> eat your chips when you're not looking.

Another data point : Vermason sell two different grades of foam
for that purpose.

  http://vermason.co.uk/FullCatalog/Packaging/Foam/ConductivePinInsertionFoam/241530/
  241530 FOAM, CONDUCT, PIN-INSERTION,  6MM x 1M x 1M
    * Prior Vermason Item Number: L2506
    * Carbon impregnated high density open-cell polyurethane foam,
    * Density 35 to 55kg/m3
    * Provides mechanical and ESD protection, retains devices by
      their pins, non-corrosive
    * Brings inserted terminals and pins to equipotential
    * Rs: <10E4 ohms; Rv: <10E3 ohms/m
    * £13.30 (13.30 GBP/m²)

  http://vermason.co.uk/FullCatalog/Packaging/Foam/ConductiveClosedCellPinInsertionFoam/241560/
  241560 FOAM, CONDUCT, PIN-INSERTION, CLOSED CELL, 6MM x 1M x 2M
    * Prior Vermason Item Number: L2650
    * Cross-linked, closed-cell polyethylene foam
    * Density 32kg/m3
    * Excellent chemical and physical stability; good for long
      term storage
    * Ideal pin-insertion and pin-retention characteristics
    * Brings inserted terminals and pins to equipotential
    * Rs: 10E3 to 10E5 ohms; Rv: <10E3 ohms/m
    * £32.60 (16.30 GBP/m²)

The more expensive product is not the denser one ; it's the one
made of polyethylene and supposedly "good for long term storage".

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>
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