N/A Inside a Chinese Carbon Fiber Bottle (is this normal?)

[hgg2k]

Hi,

I have just received a 0.36L CF bottle to upgrade the small AEA HP SS tube.
First of all the seller lied and while he told me that all the bottles were made
during the past 30 days, the CF bottle had a manufacture date of 06 - 2023.
Already nine months old and the re testing period is 3 years.
https://www.aliexpress.com/item/1005006221649697.html

Anyway, I have inspected the inside of the bottle with a small camera and you
can see the video at the link below:

I am no expert in CF bottles and this is my first one, but I would like to ask you
if this looks normal? The inside surface is very rough and there is some
black stuff/residue inside as well. Carbon fibers? Not sure. On the outside
everything looks fine as well as the threads.

Any comments?
Thanks.

 

[heavy-impact]

All carbon fiber bottles regardless of size are wound over an aluminum bladder.

 

[hgg2k]

All carbon fiber bottles regardless of size are wound over an aluminum bladder.

I know the inner liner is aluminum.
I am asking if this looks normal?

 

[heavy-impact]

Yes.

 

[hgg2k]

What about the black residue?

 

[dgeesaman]

My comments:

Carbin fiber bottles

Anyone have info on the carbon bottles Chinese websites?

www.airgunnation.com

Chinese companies have no accountability other than doing enough to get your money. And once they have it the transaction is over. Therefore I will never buy pressure containing components that weren’t at least re-sold or imported by someone who is legally accountable to provide a safe, functional product.

I don’t have experience looking inside of any bottles like that even though I own a few. But I can suggest that any residue that could flake off the inside will wreak havoc on regulators, valves, and transfer ports.

 

[hgg2k]

But I can suggest that any residue that could flake off the inside will wreak havoc on regulators, valves, and transfer ports.

Exactly, that is why I am asking.

 

[rcs9250]

You could always put some tumbling media and a little water with some Simple Green in it to clean it up. Did many steel and aluminum scuba tanks like that through the years.

 

[hgg2k]

I think I will give it a try and see what happens.
Not sure I like the very rough surface though.
It almost looks like pitting.

 

[heavy-impact]

Just don't use any alkaline cleaning product.
Respectfully I suggest you blow it out with compressed air and put it in use or return it if you do not feel safe.

 

[hgg2k]

I used a rod with some wet cotton and after rubbing it, it came out white clean.
Used a few drops of Fairy liquid with water and after shaking it for a while,
the water was clear. Strange.

I do not have a CF bottle reference to compare the surface with.
It looks pretty rough to me.

 

[WoodWelder]

Everything we own, if not totally built in China all the parts/components are and assembled elsewhere. However, how much knockoff name-brand cargo makes it to our shore inspected?
I wouldn't purchase one item from those eCommerce sites out of China. They are the knockoff king of crap!

 

[hgg2k]

True.

The funny thing is that they are giving a 15 year life and a 3 year inspection interval.
On the bottle though I cannot see any DOT-SP markings.
Who will do the hydrotesting without a DOT-SP marking?..

There is also an REE: 4 marking written on the bottle, what does this mean?

 

[dgeesaman]

Exactly, that is why I am asking.

I would rinse with water and scrub with a kitchen bottle brush.

Then I would throw it away because I wouldn’t trust it to hold pressure.

 

[Loff]

True.

The funny thing is that they are giving a 15 year life and a 3 year inspection interval.
On the bottle though I cannot see any DOT-SP markings.
Who will do the hydrotesting without a DOT-SP marking?..

There is also an REE: 4 marking written on the bottle, what does this mean?

They can write anything on that bottle, that doesn't mean those words mean that.

 

[hgg2k]

It would be interesting to see and compare a photo of the inside liner from an FX bottle
or another expensive brand.

 

[bigHUN]

Just a honest question...
What you think how these shape aluminum bottles are "fabricated"? I can assume the black particles are remains of a process that a first initial automated wash didn't fully removed.
I don't see a problem with that, not a first and not a last...

 

[barreira]

Where do you think the "other" CF bottles are made?

 

[dgeesaman]

Where do you think the "other" CF bottles are made?

In a factory that is held to actual quality standards. It’s not about who makes it, it’s about the quality of each and every piece.

Even the same factory has various machines and tooling and when those stop making good enough product for their prime customer, they can make product using tooling and raw materials that no longer meet standards and sell it directly.

 

[rcs9250]

True.

The funny thing is that they are giving a 15 year life and a 3 year inspection interval.
On the bottle though I cannot see any DOT-SP markings.
Who will do the hydrotesting without a DOT-SP marking?..

There is also an REE: 4 marking written on the bottle, what does this mean?

REE stands for Rejection Elastic Expansion. It’s part of the criteria for hydro testing. In other words, info for the re-tester facility.