How do you guys clean plastic reload liner that has melted...

[jahall4]

... and "bonded" to your aluminum case?

 

[danielsadjadi]

Pop it in the freezer overnight and run hot water over it?

https://www.rocketryforum.com/showthread.php?121751-Plastic-Liner-Stuck-Inside-Case

 

[423yjl]

invest in some bottle brushes to get those little sticky bits out

those G65's are my favorite flavor of 24mm

 

[sharkbait]

Pop it in the freezer overnight and run hot water over it?

https://www.rocketryforum.com/showthread.php?121751-Plastic-Liner-Stuck-Inside-Case

+1. Freeze then hot H2O and it should pop out

Little acetone and brushing will get any residue off, but wash out with dush soap and water after acetone brushing

To avoid this in the future, spray the inside of your case with CRC Heavy Duty Silicone spray before inserting your reload.

 

[jahall4]

Pop it in the freezer overnight and run hot water over it?

https://www.rocketryforum.com/showthread.php?121751-Plastic-Liner-Stuck-Inside-Case

Liner is not stuck that way. Might be easier if it was :-(

 

[jahall4]

invest in some bottle brushes to get those little sticky bits out

those G65's are my favorite flavor of 24mm

So far brushes are not working. I'm afraid anything stiff enough removed the "baked on plastic" will scratch the alum case!

First time trying a long burn, love the way they burn here is the video:
[video=youtube;3gUHxAKsV5c]https://www.youtube.com/watch?v=3gUHxAKsV5c&feature=youtu.be[/video]

 

[jahall4]

+1. Freeze then hot H2O and it should pop out

Little acetone and brushing will get any residue off, but wash out with dush soap and water after acetone brushing

To avoid this in the future, spray the inside of your case with CRC Heavy Duty Silicone spray before inserting your reload.

Again, the liner is NOT "stuck in" the case. That's why I included to picture. :/

 

[ttabbal]

Again, the liner is NOT "stuck in" the case. That's why I included to picture. :/

The cold/hot trick may still help. You can also try letting acetone soak on it for a while, it will dissolve some plastics and the cooling as it evaporates might help as well.

I'm not sure of the inside diameter as I don't have any CTI 24mm, but if a PVC pipe fits well, you can bevel the end to make a scraper tool.

Heat the case to 80C or so and the plastic will probably wipe right off. You may well burn yourself though.

Video is private BTW...

 

[tim cubbedge]

Try some scotch brite.

 

[scsager]

Soak overnite with some kind of lubricant. WD40 or something similar. The idea is that with a little time, the lubricant will get in-between the metal case and the plastic crud. Then try pushing out the chunk of liner with a wooden dowel.

Another idea is to use an electric heat gun (cheap at harbor freight) to heat up (soften) that chunk of liner and then push it out with the dowel.

 

[jahall4]

The cold/hot trick may still help. You can also try letting acetone soak on it for a while, it will dissolve some plastics and the cooling as it evaporates might help as well.

I'm not sure of the inside diameter as I don't have any CTI 24mm, but if a PVC pipe fits well, you can bevel the end to make a scraper tool.

Heat the case to 80C or so and the plastic will probably wipe right off. You may well burn yourself though.

Video is private BTW...

Had to cancel the upload just taking to darn long. YouTube is so slow.

 

[jahall4]

Soak overnite with some kind of lubricant. WD40 or something similar. The idea is that with a little time, the lubricant will get in-between the metal case and the plastic crud. Then try pushing out the chunk of liner with a wooden dowel.

Another idea is to use an electric heat gun (cheap at harbor freight) to heat up (soften) that chunk of liner and then push it out with the dowel.

Lubricate like WD40 interesting idea, but heat maybe the only thing that will work. I did notice that one can "light" the plastic reload liner with a match. Just can't get the plastic layer inside the case to burn.

 

[blackjack2564]

I use a wood dowel & just scrape it off. Wood will not scratch the aluminum case. PVC pipe works well also, just 'catch' an edge of stuck plastic and bang off.

For really stuck on stuff, I insert a spacer backwards [the back edge forward] this always scrapes the plastic off. Push it in with dowel, if it sticks push out from front with same. Never had this method fail.

 

[Woody's Workshop]

Put it in the oven for a few minutes, make it soft and use a wet pop sickle stick to scrape with.
Soaking it in lacquer thinner will also release the bond, but may remove some color as well.

 

[Q-Aero]

Use a mixture of isooctane, butane, 3-ethyltoluene, and octane, commonly call gasoline and soak in it for few hours

 

[Incongruent]

Lubricate like WD40 interesting idea, but heat maybe the only thing that will work. I did notice that one can "light" the plastic reload liner with a match. Just can't get the plastic layer inside the case to burn.

Acetone and match? The acetone should help it burn.
If that doesn't work, get some 1/4 inch copper refrigeration coil, screw in the nozzle and hook that end up to an air compressor, bend the refrigeration coil into a soft 90 degree curve, crimp the tip to limit flow, hook up to giant vat of gasoline, siphoned down tube, insert end into motor, turn on air compressor, light, and this is a bad idea, isn't it?

 

[Incongruent]

What kind of plastic is the liner made of?

 

[jahall4]

What kind of plastic is the liner made of?

That's a good question. I can tell you that 3M Adhesive Cleaner won't soften it even when soaked, which is a surprise because it has affected most every plastic I have used it on.

 

[jahall4]

Use a mixture of isooctane, butane, 3-ethyltoluene, and octane, commonly call gasoline and soak in it for few hours

I was headed there just did not have any w/o oil in it handy.

Ultimately Scott Sager gets the gold star for his WD40 suggestion. I used another penetrating lubricant called LPS2. After a few hours it softened enough that it could be readily scrapped from the case with a wood dowel.

Thanks everyone! Have a nice Holiday weekend.

 

[jahall4]

I use a wood dowel & just scrape it off. Wood will not scratch the aluminum case. PVC pipe works well also, just 'catch' an edge of stuck plastic and bang off.

For really stuck on stuff, I insert a spacer backwards [the back edge forward] this always scrapes the plastic off. Push it in with dowel, if it sticks push out from front with same. Never had this method fail.

Thanks Jim, but it wouldn't scrape until I got it softened up. Spacer is a great idea and I thought of it too, but alas 24mm don't have spacers :-(.

 

[Incongruent]

That's a good question. I can tell you that 3M Adhesive Cleaner won't soften it even when soaked, which is a surprise because it has affected most every plastic I have used it on.

According to the MSDS, 3M adhesive cleaner is:

Ingredient	C.A.S. No.	% by Wt
Xylene	1330-20-7	30 - 60 Trade Secret *
Hydrotreated Light Naphtha (Petroleum)	64742-49-0	30 - 60 Trade Secret *
Ethylbenzene	100-41-4	7 - 13 Trade Secret *
Toluene	108-88-3	0.5 - 1.5 Trade Secret *
Benzene	71-43-2	< 0.1 Trade Secret *

(https://multimedia.3m.com/mws/mediawebserver?mwsId=SSSSSuUn_zu8l00x4xt9PxmxOv70k17zHvu9lxtD7SSSSSS--)

 

[Incongruent]

That's a good question. I can tell you that 3M Adhesive Cleaner won't soften it even when soaked, which is a surprise because it has affected most every plastic I have used it on.

Can you describe the material? Stiffness, density (an approximation would work), an image of the plastic before and after firing, etc.

Thanks!

 

[tim cubbedge]

Can you describe the material? Stiffness, density (an approximation would work), an image of the plastic before and after firing, etc.

Thanks!

... and "bonded" to your aluminum case?
View attachment 305991

It's a CTI liner - post #1

 

[jahall4]

Finally got the launch uploaded. Our first Long Burn. Love the way they burn even if they do "dirty" their case! ;-)

[video=youtube;GE5vTfjS8Hg]https://www.youtube.com/watch?v=GE5vTfjS8Hg[/video]

 

[BLKKROW]

I do not have any suggestions besides what was mentioned above. My only future suggestion is to spray the inside of the casing with silicone lubrication before putting the reload in.

 

[OverTheTop]

I thought the liners were a phenolic of some sort. Not much dissolves them. Maybe methylene chloride (dichloromethane) or something similarly nasty might soften it, so you can then work away with the dowel.

BTW if using methylene chloride use appropriate PPE. Glove, safety glasses, good ventilation. It is noted as carcinogenic I think.