Split New Inner Tubes
- Thread starter Penthode
- Start date
updraught
Well-known member
A few snippets from the below PDF on tube production.
Advantages of butyl innertubes to end users (vehicle owners)
In summary, use of butyl rubber innertubes offers a number of
advantages to the tire end user such as:
• Consistent inflation pressure.
• Reduction in tire rolling resistance, due to the better
inflation pressure retention, which may improve fuel
consumption.
• Longer tire life and more even-wear performance.
• Longer innertube life due to better heat stability.
• Enhanced tire durability.
....
Low modulus innertube
The concept of “low modulus” innertube compounding is an
important parameter for innertubes designed for service in
radial ply tires. Radial ply tires have a longer service life than
bias ply tires. Moreover, the radial ply construction of such tires
results in a higher degree of flexing of both the sidewall and
the innertube fitted inside the tire. Thus, not only must the
innertube last longer in a radial ply tire, it must do so under
conditions that results in a higher stress on the innertube walls
and particularly the innertube splice. In this regard, when
compared to general purpose rubber innertubes, the
advantages of low modulus butyl rubber innertubes could be
listed as follows:
• Compound processing:
- Good flow and green tack, and,
- Improved splice properties.
...
Guidelines for splicing
Splicing, like mixing, is an important step in butyl rubber
innertube production and should be performed as efficiently as
possible, since splice faults often form a large proportion of
total rejects. The worldwide trend of increasing use of radial
ply tires has meant that greater performance demands have
been made upon the innertube splice which must withstand
the higher degree of flexing of the radial tire sidewall and the
innerliner splice must continue to do so throughout the much
longer life of a radial tire.
https://www.exxonmobilchemical.com/..._compounding_and_application_manual_enpdf.pdf
Advantages of butyl innertubes to end users (vehicle owners)
In summary, use of butyl rubber innertubes offers a number of
advantages to the tire end user such as:
• Consistent inflation pressure.
• Reduction in tire rolling resistance, due to the better
inflation pressure retention, which may improve fuel
consumption.
• Longer tire life and more even-wear performance.
• Longer innertube life due to better heat stability.
• Enhanced tire durability.
....
Low modulus innertube
The concept of “low modulus” innertube compounding is an
important parameter for innertubes designed for service in
radial ply tires. Radial ply tires have a longer service life than
bias ply tires. Moreover, the radial ply construction of such tires
results in a higher degree of flexing of both the sidewall and
the innertube fitted inside the tire. Thus, not only must the
innertube last longer in a radial ply tire, it must do so under
conditions that results in a higher stress on the innertube walls
and particularly the innertube splice. In this regard, when
compared to general purpose rubber innertubes, the
advantages of low modulus butyl rubber innertubes could be
listed as follows:
• Compound processing:
- Good flow and green tack, and,
- Improved splice properties.
...
Guidelines for splicing
Splicing, like mixing, is an important step in butyl rubber
innertube production and should be performed as efficiently as
possible, since splice faults often form a large proportion of
total rejects. The worldwide trend of increasing use of radial
ply tires has meant that greater performance demands have
been made upon the innertube splice which must withstand
the higher degree of flexing of the radial tire sidewall and the
innerliner splice must continue to do so throughout the much
longer life of a radial tire.
https://www.exxonmobilchemical.com/..._compounding_and_application_manual_enpdf.pdf
TerryO
Well-known member
After the bad experiences I have had with bicycle tubes (splitting in the seams)and tractor tubes ( same problem) in the last 3 or 4 years I will trust my old tubes. I still have the tubes that were on the A I bought in 1990 and even though I replaced tires and tubes back then (USA made) I put the old ones in my tire rack and I'm glad I did.
TerryO
TerryO
Synchro909
Well-known member
Sorry, I have to disagree about tubes having seams. If you turn one inside out, you see only a uniform surface all over. If there were seams, you would see lines on both sides. What we see on the outside is only where different parts of the mold come together.
Why tubes would be more prone to splitting o long those lines, I don’t know but they are not seams IMHO.
Synchro909
Well-known member
OK, no seams but they still crack on the line where the molds come togetherI admit I have never seen tubes made or really inspected one to try to figure out how they are made but the old ones work fine and the new ones I have had are junk
TerryO
100% agreement there!
Tom Wesenberg
Well-known member
Yep, I have the same experience with today's junk inner tubes. American made have always been good.
Rich in Tucson
Senior Member
Do your split tubes say "Made in DenmarK"? If so, they were not new when you bought them and were made for tractors years ago. They were dumped in the USA and as far as I know have a 100% failure rate in just the manner you experienced. Very thick rubber or technically a plastic or whatever tubes are composed of and they fooled a lot of people.
Synchro909
Well-known member
Some of those “Made in Denmark” tubes are marked “Made in EEC”. I believe they are recycled material and absolute junk.
Lot of good info here! At my age and tire changing capability, I bought Coker tires and took my Model A ford up to my local repair shop. The owner told me he would remove the old tires, inspect and clean the rust on the rims if necessary, install inner tube rim protectors and new tubes. I have no idea where the stuff came from, all I knew was he stated he had done this before and had no problems with his parts source. And the car was ready the next day. It has been a year and no problems!
iron mountain 1
Member
in the last couple of weeks I was excited about buying new tires and metal stem tubes for my late 31 CCPU.
The tubes had metal stems like original. I installed them (extremely careful not to pinch tube) and two held air for about 25 minutes before I heard a "poof" and they lost air. I only inflated to 25 psi. The tubes were marked "made in EEC"
I just found this post and am now educated on tubes.
Will I be able to salvage the stems and put them in tubes from Bert's or Bratton's? Or Will they have new tubes with the metal stems already installed.
Thanks Kris
The tubes had metal stems like original. I installed them (extremely careful not to pinch tube) and two held air for about 25 minutes before I heard a "poof" and they lost air. I only inflated to 25 psi. The tubes were marked "made in EEC"
I just found this post and am now educated on tubes.
Will I be able to salvage the stems and put them in tubes from Bert's or Bratton's? Or Will they have new tubes with the metal stems already installed.
Thanks Kris
