Rubber Info
Rubber Info
(OP)
Hello all
I am manufacturing rubber tires for radio controlled offroad trucks, i did my first tires with NR which have a very good grip but they dont last so much , the rocks and rough terrain worn them pretty quick.
Now im trying to find the best rubber choice to avoid premature wear without loosing grip (at least not much)
reading here and there found some nice tables which show rubber properties comparison, I found theese the most useful:
http://www.srp-rubber.com/materia.htm
h ttp://www. tsrubber.c om/en/comp ound_termi nology.php
looking to them looks like CR (neoprene) , SBR and NBR are the best choice with good abrasion resistance and good tackyness
but there is something i dont understand: in SRP table , NR shows "Excelent Abrasion" what does it mean? i gues the field "abrasion" means "abrasion resistance" , but then NR is excelent on this? i think this data is just wrong , but i am not engineer so i cant be sure...
can anyone please confirm the abrassion resistance of NR is good or bad?
Also any extra info you can tell me about the best choice for my tires is highly welcomed
thanks a million in advance
I am manufacturing rubber tires for radio controlled offroad trucks, i did my first tires with NR which have a very good grip but they dont last so much , the rocks and rough terrain worn them pretty quick.
Now im trying to find the best rubber choice to avoid premature wear without loosing grip (at least not much)
reading here and there found some nice tables which show rubber properties comparison, I found theese the most useful:
http://www.srp-rubber.com/materia.htm
h
looking to them looks like CR (neoprene) , SBR and NBR are the best choice with good abrasion resistance and good tackyness
but there is something i dont understand: in SRP table , NR shows "Excelent Abrasion" what does it mean? i gues the field "abrasion" means "abrasion resistance" , but then NR is excelent on this? i think this data is just wrong , but i am not engineer so i cant be sure...
can anyone please confirm the abrassion resistance of NR is good or bad?
Also any extra info you can tell me about the best choice for my tires is highly welcomed
thanks a million in advance





RE: Rubber Info
RE: Rubber Info
I'm not a tire expert, but I wonder if the quality of the natural rubber compound you're using can be improved to have better abrasion. BR (butadiene rubber) is also excellent for abrasion resistance, and is commonly used in blends with NR.
Another possibility is urethane; urethanes as a general category are also excellent for abrasion resistance, and you sometimes see them rated higher than NR. My company, TSE Industries, makes millable urethanes (Millathane®), processed on rubber equipment, that are used in applications that need excellent abrasion resistance and high mechanical strength. They're not the best for heat build-up, so if that's a factor other polymers would be better for the off-road tires. Millable urethanes are quite a bit more expensive than NR and other common polymers, also.
Tom Jablonowski, TSE Industries, Inc.
www.tse-industries.com
RE: Rubber Info
the thing is to allow maximum grip i did my tires with NR 35 durometer, its dificult to find the balance between grip and long life...
i think i will do both things, to mix NR + BR (70%-30%) and to increase the durometer to 40 or 45 and will see how they perform and last
thanks again , if you have any other comments i will allways welcome !
RE: Rubber Info
RE: Rubber Info
sorry but i dont understnad you well, would you be so kind and say it again with other words?
maybe a direction to tell my rubber manufacturer?
RE: Rubber Info
RE: Rubber Info
i asked my rubber manufacturer about their vulcanization method, they told me they do "oxide cure" , they say "it doesnt affect rubber properties" ... what do you think?
RE: Rubber Info
Generally, sulfur cure systems give better abrasion resistance and physical properties, while peroxide cures give better heat aging and compression set properties. Within each type of cure system, there are numerous variations in the type and amount of chemicals used. A good custom mixer can advise the best cure system for your end product and manufacturing process.
If the compound you're using isn't cured with sulfur, you may want to evaluate a sulfur cured compound.
Tom Jablonowski, TSE Industries, Inc.
www.tse-industries.com
RE: Rubber Info
RE: Rubber Info
RE: Rubber Info
That being said, with sulfur or peroxide cure systems, if ingredients are added that are above their solubility limit in the compound, they may bloom to the surface, giving a whitish powdery deposit on the surface. Undercuring the rubber (not giving it enough time or temperature to cure) can also promote blooming. But, a typical sulfur or peroxide cure system shouldn't bloom and affect tack.
Tom Jablonowski, TSE Industries, Inc.
www.tse-industries.com
RE: Rubber Info
RE: Rubber Info
is this normal? will sulfure inside the rubber cause the same sulfure cure properties?
RE: Rubber Info
It sounds like the sulfur and other ingredients are already mixed into the rubber compound when your "rubber manufacturer" buys the compound.
With the compound variations you're thinking of trying (raising the hardness and trying a blend of NR with BR), is that something your "rubber manufacturer" is doing, or their supplier, or you? Just curious . . .
Tom Jablonowski, TSE Industries, Inc.
www.tse-industries.com
RE: Rubber Info
i design the tires, and pay a rubber parts company to make moulds and final pieces, then , the rubber parts company buy the rubber from a rubber material supplier to make my parts
rubber part company told me that the rubber they buy from the rubber supplier is already mixed with sulfur (probably got this info from the rubber supplier)
and finally its me the one looking to increase resistance so its my idea to mix compounds, but not sure who will do the mix for me, the rubber part company i deal with OR the rubber material supplier
RE: Rubber Info
to use rubber compound with sulfure already on it , is exactly the same than curing the rubber with sulfure? should it cause similar properties to the final rubber part?
RE: Rubber Info
It's probably a little confusing because "cure" refers to the type of chemicals that are used in the compound (either sulfur or peroxide) as well as the process or method of vulcanization/curing (by molding, for example).
If you do a search on the internet for 'rubber curing' or 'sulfur curing' you'll find some better explanations.
So, your question is referring to the same thing in different ways; sulfur is in the compound, and it is used to cure the rubber.
Tom Jablonowski, TSE Industries, Inc.
www.tse-industries.com
RE: Rubber Info
RE: Rubber Info
I have seen applications where the fact that the natural rubber wears is an advantage since it continually exposes fresh rubber which is where the grip comes from. If the tires are cutting or chunking out, you need to add a reinforcing filler.
As others have pointed out, the cure system is also important, and should be designed to give you the best possible dynamic properties.
It is common in the rubber industry to "extend" rubber compounds with non-reinforcing fillers like kaolin. Obviously this reduces the cost, but also affects the performance. Make sure that whatever you have specified is, in fact, what you are getting.
You cannot do better than natural rubber in this type application. Polybutadiene (BR) requires reinforcement (carbon black), even when blended with natural rubber. BR is great when used in a tire tread because of it's low heat build-up characteristics...but I doubt this is going to help your application.
RE: Rubber Info
RE: Rubber Info
High performance R/C tire manufacturers use it.
Excellent high energy absorption (good traction)
Michael Chou, Mykin Inc
www.mykinonline.com
RE: Rubber Info
I am a bit confused by some of the informations - the company uses (per)oxide curing systems, but the sulfur is already in the compound? Sounds strange, due to the fact that you do put just one of them in your compound, never both.
RE: Rubber Info
RE: Rubber Info
http://
you can find some information of the manufacture of tyres.
I hope that is will give you a help
regards
G.L. Volontà
www.ebonite.it