Pvs,Plastic,Teflon

[Refiner232121]

I am guessing that nitric acid ,sulfuric acid,AR cant harm Pvs,Teflon.

Will these acids eat away plastic ,or are all 3 the same

 

[chemist]

Sulfuric acid is normally sold in plastic polyethylene bottles.
Neither sulfuric nor nitric will bother Teflon.

 

[goldnugget77]

I am not sure but all 3 are OK for gold refining

 

[4metals]

Nitric acid and aqua regia will take their toll on all PVC and Polypropylene. Teflon's OK but expensive. If you are looking for a material of construction for refining in the plastics get brittle over time and eventually crack, much like if you leave it out in the sun for a long time. I've used plastic buckets for acid refining for ever. Just get in the habit of squeezing the pail before you use it, if it's stiff and cracks or doesn't flex like a new pail, consider replacing it.

For storing nitric, stainless steel or glass.

If you do use 5 gallon pails, cut off the handles. If the handles are there we use them, it's human nature, but they are metal and in the acid environment they corrode and break at the most inopportune moments. To be safe I always cut them off.

 

[Oz]

Wise advice on the handles.

 

[aflacglobal]

I looked at my 5 gallon buckets which are about 3 month old yesterday and observed the same thing. Having been in commercial coating in the past i have emptied many a many a many 5 gallon buckets. I couldn't tell you how many times i have pick a new bucket up only to have the handle come off in my hands. Think about 5 gallons of ap in your lap. :shock:

I thought about taking the handles out and using polypropylene rope instead. I used many a bucket held with rope that did better that handles and it won't rust.

 

[overdriv]

Could someone please comment on ABS (PVC), Nylon, Polyethylene and the reaction that brown fumes from AR would cause to them. I am building a scrubber and have bought Polyethylene tubing for the second, third, and fourth stage of the scrubber, but can only find nylon fittings nibs and nuts and ABS, PVC fittings for the tubing hook ups. (I have PTFE 1" tubing for the first stage of the scrubber, from the lab hood to the first chamber of spraying weak lye onto crushed marble rocks). My assumption is that the NOX (brown fumes) would be neutralized 80% by the first stage and then a second 80% going through a second stage of lye spray over crushed marble.

Also could someone comment on using a vacuum pump being used to suck the brown fumes through the process. Since this is a oil based vacuum pump I am worried about any reaction that might happen with the oil in the pump and the residual fumes.

By the way this is an awesome forum.


overdriv

 

[Harold_V]

By the way this is an awesome forum.


overdriv

Thank you, and, yes, it is!
We've worked hard at keeping the riff-raff to a minimum, and have insisted on adult behavior on behalf of the participants. It appears to be paying huge dividends.

Harold

 

[qst42know]

Nylon is a poor choice for acids and it's susceptible to chlorine compounds.

 

[overdriv]

Nylon is a poor choice for acids and it's susceptible to chlorine compounds.

Thank you very much for your reply, what would be a better replacement for the nylon fittings PVC? I do not think they make teflon fittings. I think that my choices are for this type of fitting is either Polyethylene, Polyvinylidene (Kynar), or Polypropylene. Which do you think is the best for the scrubber?

 

[qst42know]

Polypropylene would fit my budget better. :lol:

Teflon would be far more expensive but would likely outlast the both of us. :mrgreen:

 

[Irons]

Nylon is a poor choice for acids and it's susceptible to chlorine compounds.

Thank you very much for your reply, what would be a better replacement for the nylon fittings PVC? I do not think they make teflon fittings. I think that my choices are for this type of fitting is either Polyethylene, Polyvinylidene (Kynar), or Polypropylene. Which do you think is the best for the scrubber?

Teflon fittings are very expensive. Even on Fleabay, they can be several tens of dollars. I was lucky to pick up a lot of fittings at a reasonable price.

I priced some 2 liter Nalgene Teflon bottles and they were over $300 US. Picked up some used ones that looked new on Fleabay for a fraction of that.

Teflon Is the way to go if you can afford it. I like it better than glass, if only for the safety factor.

 

[overdriv]

Polypropylene would fit my budget better. :lol:

Teflon would be far more expensive but would likely outlast the both of us. :mrgreen:

Thank you for your reply, it is not too late for me switch out to Polypropylene. I want to thank all of you for being so kind as to respond and so quickly. I have been on other forums where it takes forever for a response. I will be also good and respond quick and be helpful.

 

[Irons]

Polypropylene would fit my budget better. :lol:

Teflon would be far more expensive but would likely outlast the both of us. :mrgreen:

Thank you for your reply, it is not too late for me switch out to Polypropylene. I want to thank all of you for being so kind as to respond and so quickly. I have been on other forums where it takes forever for a response. I will be also good and respond quick and be helpful.

You think that was fast, just try and pull the wool over on someone here and see how quickly one gets their butt handed to them. :mrgreen:

 

[nickvc]

Polypropylene would fit my budget better. :lol:

Teflon would be far more expensive but would likely outlast the both of us. :mrgreen:

Thank you for your reply, it is not too late for me switch out to Polypropylene. I want to thank all of you for being so kind as to respond and so quickly. I have been on other forums where it takes forever for a response. I will be also good and respond quick and be helpful.

You think that was fast, just try and pull the wool over on someone here and see how quickly one gets their butt handed to them. :mrgreen:

So true , but sometimes necessary to maintain standards and accuracy , the reason we all visit and keep coming back.

 

[overdriv]

I have found 1" teflon nib type fittings costing about $17. each for the PTFE tube that I am buying today . I have breathed in some NOX on the first attempt of using AR and that I hope will be my last (I have already lived past the two week mark.) I like AR because of the efficiency of the process. The electrical Shor method was problematic for me.

 

[Irons]

Nylon is a poor choice for acids and it's susceptible to chlorine compounds.

Nylon is good for alkaline solutions.

 

[overdriv]

Thanks Irons:

I will use them when I have to upgrade my scrubber if I have too. What do you think about using the bedliner paint to make/paint the inside of a fume hood? Will this react with the NOX or is it though enough for the fume hood / lab hood/ scrubber hood -stage one.

 

[Lou]

Polypropylene is quite resistant to acids as is HDPE. The higher the molecular weight, the better. You can buy fluorinated PP or HDPE for a fraction of the price of fluoropolymers.

Teflon is super expensive. I have dozens of those FEP bottles that you talk about Irons--I love them!!! I remember linking to them here on this site.


Irons--Nylon is NOT base safe or acid safe--it is a condensation polymer made from an acid and an amine, a polyamide. Polyamides and esters all hydrolyze in acid or base. Phenolics are also usually base-sensitive, as is fluoropolymers (for really really strong bases, PTFE is contraindicated and PP or HDPE is preferred).

 

[Barren Realms 007]

contraindicated: Could you put that in english please.