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MAPP Plastics Discussion Forum

The MAPP Plastic Industry Discussion Forum allows members to rapidly communicate with each other. Post both questions and answers to questions that other MAPP members have about any industry topic from material and process issues to R&E Tax Credits and other business issues.

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Posted:  10 Apr 2012 15:17
We have medical clean room and are starting to run implantable materials.  My concern is the anti-seize being used on the end cap bolts, nozzle adapter threads, nozzle tip threads, tip assm threads, etc.  This to get into the implantable part would be catastrophic!  The material is high temp(750 - 780F).  So we need a high temp medical grade anti-seize.  Anyone know of any or have experience with this subject??  We are presently using a high temp nickle grad.

Mike Loveless
Posted:  12 Apr 2012 22:08
Bad news is that Anti Seize compounds use some type of metal (Cu or Ni) as a key part of their formulation.

Good news is that Nozzle Bodies, End Caps, Nozzle Tips, etc. create a metal to metal seal when properly installed.  As example, there should be threads showing when a Nozzle Tip's seat is sealed against the mating seat of the Nozzle Body.  When so fitted, there should be no flow path for the Anti Seize to migrate into the melt stream.

Routine examination of the Nozzle Tips, Nozzle Bodies, End Caps, etc. should be done to see if there is any wear or damage to the critical mating surfaces.  If there is not a total metal to metal shut-off, then repair and/or replace the questionable items ASAP.

P.S. - You do need to keep everything "clean".  As example, don't just smear the entire Nozzle Tip with Anti Seize, but only coat the threads.

Steve Z.
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