Ok, so this is not a normal technical question for Pico, as it's not waveform related, but not the less an important one for anyone who uses a piercing style probe from time to time (best avoided but sometimes the only way).
We have been using a Silicon based sealant to cover/fill any hole we make, however it has been brought t my attention that this is possibly worse that leaving it open, as the silicon reacts with the wire in a bad way!
I have asked some of our electrical component suppliers technical teams to give advise but they have been unable to give any real clarity on the best solution, so I thought I'd pose the question here!
What do you use ?
Ideally want to cover the following requirements:
- good insulation properties
- good environmental seal to stop air and water penetration
- not cause corrosion (as most silicon's do react with the wire I understand ?!)
- Adhere to plastic and PVC (and polyolefin)
- Vibration safe
- Flexible once cured
- Life of 10years + (as we work on vehicles that will be around for 50 years or more)
- good skin properties (ie not sticky once applied and cured)
- Temperature Resistance (sometime might be an injector wire etc close to the engine) so -20c to +150c min ideally +200c
- Chemical resistance (oil, RTF, degreasant, salt and other typical fluids used in Automotive cleaning etc)
- Clear/neutral colour (minor point!)
We've historically always used basic silicon based stuff and that might be doing as much harm as good.
While typing, one supplier's tech team have offered the following:
- Dow Corning® 3145 RTV Silicone Sealant
which is not cheap, but seems to fit the bill.
Still be interested to hear what others use.