How can I identify a polymer which has a UV stabaliser additive
How can I identify a polymer which has a UV stabaliser additive
(OP)
Hi Guy's;
Im looking for a solution to the following problem. We are currently in the design phase of a new project which includes the moulding of an exterior component which must be UV ressistant. The problem is in identifying that the correct materila has been used during the moulding process. Idealy, we would like to find a method of quickly checking parts at various times during production. The material being specified is UV Durethan BKV 30 G H2.0 900116. The material supplier has stated that it could be checked via its melt flow index, thats fine for material varification on delivery but we would like to eliminate the possibility of moulding in the wrong material during production and be able to carry out checks along the way. Any ideas gents?
Im looking for a solution to the following problem. We are currently in the design phase of a new project which includes the moulding of an exterior component which must be UV ressistant. The problem is in identifying that the correct materila has been used during the moulding process. Idealy, we would like to find a method of quickly checking parts at various times during production. The material being specified is UV Durethan BKV 30 G H2.0 900116. The material supplier has stated that it could be checked via its melt flow index, thats fine for material varification on delivery but we would like to eliminate the possibility of moulding in the wrong material during production and be able to carry out checks along the way. Any ideas gents?





RE: How can I identify a polymer which has a UV stabaliser additive
If you have a method to determine copper content you will be able to relate that to the most common stabiliser used in nylons, although copper based stabilisers tend to discolour the resin so are only used on dull colours.
The pigment system used for colouring can also have a significant effect on the UV stability of the resin, well at least of the resin below the surface layer. The pigment can be checked with reasonable reliability by a spectrophotometer.
Regards
Pat
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RE: How can I identify a polymer which has a UV stabaliser additive
Your original comment about UV fluorescence makes sense to check whether your material is consistent. It won't tell you if there is the right UV stabilizer but it may tell you whether the your material has not been switched in house for something else.
UV diodes are really cheap and readily available, then I guess all you need are a light detector (probably with a filter so you know you're detecting the right wavelength) and an alarm or printout. I imagine an internet search may turn up something like that off the shelf.
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: How can I identify a polymer which has a UV stabaliser additive
We just read the grade number off the bags the stuff comes in.
The rest is good housekeeping and some sort of system.
This requires staff being able to read, of course.
Cheers
H
www.tynevalleyplastics.co.uk
RE: How can I identify a polymer which has a UV stabaliser additive
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: How can I identify a polymer which has a UV stabaliser additive
You mean you did not have titanium taps? Sheesh, what cheap skates!
H
www.tynevalleyplastics.co.uk
RE: How can I identify a polymer which has a UV stabaliser additive
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: How can I identify a polymer which has a UV stabaliser additive
It takes staff that can read, want to read and will read and then care enough to actually want to do it right.
Also occasionally the grade numbers can be only very slightly different, like Akulon K222D Wt UN0189 and Akulon K222D Wt QN0189. Same white masterbatch but different additive levels for button white and opaque electrical switch white. Technically the hopper boys mistake but really pretty easy mistake to make.
If it's Durethan BKV 30 GH2.0 900116 vs
Durethan BKV 30 G 900116 and both were in stock, that would be a potential for error that I would worry about
Staff that are prepared to work as a hopper boy who could also be depended upon to reliably differentiate at that level of detail are rare.
If I had both those in stock, I would personally place at least a days supply of the correct material beside that machine every morning.
Regards
Pat
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RE: How can I identify a polymer which has a UV stabaliser additive
If I remember correctly, Bayers colour codes that start with 9 are blacks. This might mask UV fluorescence.
Regards
Pat
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RE: How can I identify a polymer which has a UV stabaliser additive
Back after a well earned but all to short Xmas break. First of all thanks for all your replies!
Demon3 is spot on in the interpretation of the problem. The issue is one of checking that the finished componant is of the correct material. And Pat, yes the material is black. From Demons comments, am I correct in thinking that if I pass the finished part under a UV light it will detect the presence of a UV stabalising additive within the material
RE: How can I identify a polymer which has a UV stabaliser additive
Regards
Pat
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RE: How can I identify a polymer which has a UV stabaliser additive
Looks like this may be more difficult than I thought
RE: How can I identify a polymer which has a UV stabaliser additive
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: How can I identify a polymer which has a UV stabaliser additive
Ive been speaking to a new material supplier who appears much more helpful. They have stated that they already do something similar for another customer in china by mixing an additive to the base polymer. They are now speaking to thier supplier of the additive who has already confimed that it can be done with black polymer but the quantity of additive reqired may be prohibitive due the cost.
Ill keep you posted.
RE: How can I identify a polymer which has a UV stabaliser additive
If so can you use the UV stabilised grade in all jobs.
If you must use both, can you at least use different suppliers so the bags look obviously different and the trade name is different. Failing that can a BIG colour coded patch be attached to every bag as it arrives from the supplier. Can one be in bulk packs and one in 25kg bags or whatever.
Regards
Pat
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RE: How can I identify a polymer which has a UV stabaliser additive
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: How can I identify a polymer which has a UV stabaliser additive
Price premium is typically $0.05/Kg or less.
Regards
Pat
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RE: How can I identify a polymer which has a UV stabaliser additive
RE: How can I identify a polymer which has a UV stabaliser additive
Regards
Pat
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