Re: What is ion contamination? Specs are C-7000 & Q1000-119 - Material is Ultradur B4
Hi Priss80,
I looked a bit around and came about this patent application, which might be helpful in understanding. So how the ions come to be on the plastic cover? Well, they might already be in the material:
?The chemical processes used to produce many thermoplastic materials such as polycarbonate, polystyrene, polyolefins, polyesters, polyethers and the like lead to the production of thermoplastic materials that are contaminated with varying levels of ionic species, for example Mg+2, Ti+4, Cr+3, Fe+s, and Al+3 and other cations; and F-, Ch, Br, SO4"2, N02", N03", and P04-3 and other anions. Many conductive fillers, such as conductive carbon black also contain high levels of ions. Indeed, one such form of carbon, activated carbon, is used precisely for its ability to capture and retain contaminant cations and anions.? (google.com.ar/patents/WO2002018479A1?cl=en)
Additionally, try this link from Dyneon PFA on page 2 (multimedia.3m.com/mws/media/86674O/dyneontm-fluorothermoplastics-pfa-ultra-high-purity-products.pdf) or these lecture notes on page 10 and 33 (electures.informatik.uni-freiburg.de/portal/download/5001/25089/AVT_WS2012.pdf).
Here you could try and ask BASF or your material supplier if they can tell you something about the base ionic contamination of the raw material. Nevertheless, this is just the beginning. During the process there might be several other steps where ionic contamination might originate from, e.g. handling the fresh parts without gloves.
Still I think the best thing is to get your covers tested and see what the base line is. Maybe you?re already fulfilling the spec. If not, you need to find out the base line contamination from the material and trace back every step during production where something could get in contact with the parts. The contamination we are talking about here is not just ions flowing through the air like electro static charges, this is ions coming from substances, e.g. people, machines, ?
I hope this helps in understanding where the contamination might originate from.
Hi Priss80,
I looked a bit around and came about this patent application, which might be helpful in understanding. So how the ions come to be on the plastic cover? Well, they might already be in the material:
?The chemical processes used to produce many thermoplastic materials such as polycarbonate, polystyrene, polyolefins, polyesters, polyethers and the like lead to the production of thermoplastic materials that are contaminated with varying levels of ionic species, for example Mg+2, Ti+4, Cr+3, Fe+s, and Al+3 and other cations; and F-, Ch, Br, SO4"2, N02", N03", and P04-3 and other anions. Many conductive fillers, such as conductive carbon black also contain high levels of ions. Indeed, one such form of carbon, activated carbon, is used precisely for its ability to capture and retain contaminant cations and anions.? (google.com.ar/patents/WO2002018479A1?cl=en)
Additionally, try this link from Dyneon PFA on page 2 (multimedia.3m.com/mws/media/86674O/dyneontm-fluorothermoplastics-pfa-ultra-high-purity-products.pdf) or these lecture notes on page 10 and 33 (electures.informatik.uni-freiburg.de/portal/download/5001/25089/AVT_WS2012.pdf).
Here you could try and ask BASF or your material supplier if they can tell you something about the base ionic contamination of the raw material. Nevertheless, this is just the beginning. During the process there might be several other steps where ionic contamination might originate from, e.g. handling the fresh parts without gloves.
Still I think the best thing is to get your covers tested and see what the base line is. Maybe you?re already fulfilling the spec. If not, you need to find out the base line contamination from the material and trace back every step during production where something could get in contact with the parts. The contamination we are talking about here is not just ions flowing through the air like electro static charges, this is ions coming from substances, e.g. people, machines, ?
I hope this helps in understanding where the contamination might originate from.
