co-polymer, PTFE

looking for a PURE white plastic.
I have a meter of it not so long back but I cant remember what it was.lol.
it machines up lovely and very easy, pure white, appliance white not a
yellow/white which I was sent by one company.
I need to put threads into it and an led to get it to glow,but for love of
money I cant find it around here and it is getting a bit costly ordering
over the phone and then finding it is not right.
any help Please.
All the best,
Phil.
Reply to
Activeviii
Loading thread data ...
Yellow/white sounds like cast nylon. Nylon66 is much purer white, but probably not what you had.
Pure white is Acetal or PTFE, both of which are very rigid indeed.
formatting link
do PTFE rod in 12" pieces cheaply.
I'm not sure PTFE is translucent enough. Was the plastic rod you had very rigid (like metal rod) or quite elastic (not bendable like ABS plastic, but definately an amount of give to it vs brittle).
Reply to
Dorothy Bradbury
it wasn't brittle in any way but it was slightly bendable.
when cutting a thread the swarf powdery but when on the lathe it comes off like aluminium but static.
I don't know if this helps. all the best. Phil.
Reply to
Activeviii
When you say slightly bendable, that's a 1m rod, of what thickness?
o 10-12mm Nylon rod ---- a 1m length is very bendy - well on the way to making a U shape
o 10-12mm PTFE rod ---- very rigid, surprisingly heavy material ---- very uniform white ---- extraordinarily slippery, nothing marks it or sticks to it
o 10-12mm Acetal rod ---- extremely uniformly white - even nylon66 is off-white-variation
PTFE is set apart by it's slipperiness.
There are pictures of the two plastics I mention at: o PTFE ----
formatting link
o White Acetal ----
formatting link

PTFE is a cold-white, Nylon is a warm-white - very stark difference. Acetal is a slightly warmer-white than PTFE which is "analytical white".
The swarf should tell someone which it is re PTFE v Acetal. The powder sounds like Acetal, PTFE is obviously super-slippery.
Reply to
Dorothy Bradbury
Sounds like Acetal, this machines very well and is rigid. I can't remember how translucent it is.
PTFE is difficult to machine, and is not very rigid, it is also not very translucent. -- Jonathan
Barnes's theorem; for every foolproof device there is a fool greater than the proof.
To reply remove AT
Reply to
Jonathan Barnes
it sounded like PTFE but now I'm not sure as is machines absolutely beautiful and smooth, ok I have played with cutters to get them right as I couldn't get is silky smooth to start with, but now I have the cutter sorted it is like glass but feels all silky and soft.
1 mtr length will only bend a few inches but I haven't got that much left, only 4 inches or so.lol.
I really must sort my feet and millimetres out.lol.
Reply to
Activeviii
wahay I have found the old label that was on the rod.
CBP 210846 20mm Nat Acetal Rod 3M
only thing is I have some rod from another place and it is a yellowy white and not as white as the couple of inches I have left of this one.
Reply to
Activeviii
Hi My twopenneth for what it is worth.
Natural acetal will tend to 'yellow' with age, we use between 100 and 500 metres per month and get from our supplier various shades from yellow white to pure white. From our machined parts stock level it is possible to detect the ageing discolouration. There is no detriment to its properties (noticeable) from the colouring. Machines a dream. Another material that could be used is PET (polyester) one of the trade names is Eratalite. Down side of this matl is its 50% dearer than acetal.
Reply to
Dave Jones

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.