Eagle Metal Cores?
- Thread starter LukeMaff
- Start date
felinaferoz
The name is Margaret
somewhat, most likely.
felinaferoz
The name is Margaret
Netherlands.
you wheel people and your secrets!
But anyhow........wheel base is a prepolymer.
Can be: a TDI polyester (for for example printing rolls), a MDI polyester (for for example poly sheets, scrapers), a TDI polyether or MDI polyether.
Wheels mostly are made out of the MDI part of the polymers.
the polyurethane systems are noted according to the chemical nature of their constituents: isocyanate and polyol:
The First letter = nature of the diisocyanate
The Second letter = nature of the basic polyol
The Third letter (optional) = according to processing method or type of technology
Then Three to five numbers, according to:
the group (one or two first numbers)
the indicative percentage of NCO multiplied by 10 (two or three last figures)
Offcourse you also need chain extenders and hardeners, colorants, curing agents, degassing agents etc etc.
Wanna know more????????
Can be: a TDI polyester (for for example printing rolls), a MDI polyester (for for example poly sheets, scrapers), a TDI polyether or MDI polyether.
Wheels mostly are made out of the MDI part of the polymers.
the polyurethane systems are noted according to the chemical nature of their constituents: isocyanate and polyol:
The First letter = nature of the diisocyanate
The Second letter = nature of the basic polyol
The Third letter (optional) = according to processing method or type of technology
Then Three to five numbers, according to:
the group (one or two first numbers)
the indicative percentage of NCO multiplied by 10 (two or three last figures)
Offcourse you also need chain extenders and hardeners, colorants, curing agents, degassing agents etc etc.
Wanna know more????????
JonnyJonDogg
Member
whoaaaaaa
felinaferoz
The name is Margaret
do you use MDI because it is a solid? and is it already abrasion resistant or do you have to make it that way.
and i dont really understand what you mean by letters and number are you talking about the chemical make up?
and i read the hardness is just measured with a meter of how bouncy it is or isnt so could you make your wheels with different amounts of w/e or is there really only one particular way to reach a specific hardness. that cant be true because there are shitty wheels.
or is that you have to find a specific hardness and make it more abrasion resistant with out it being to... hard? soft? meh?
and your wheels always seem soft but lets say clear wheels would they be made of tdi or a different base that is clear liquid?
and im terrible at chemistry so its hard for me to understand.
and i dont really understand what you mean by letters and number are you talking about the chemical make up?
and i read the hardness is just measured with a meter of how bouncy it is or isnt so could you make your wheels with different amounts of w/e or is there really only one particular way to reach a specific hardness. that cant be true because there are shitty wheels.
or is that you have to find a specific hardness and make it more abrasion resistant with out it being to... hard? soft? meh?
and your wheels always seem soft but lets say clear wheels would they be made of tdi or a different base that is clear liquid?
and im terrible at chemistry so its hard for me to understand.
The MDI is solid when it come in but will be heated to make it fluid for production.
Its absolute NOT abrasion resistant, for that you need to add different polyols, agents etc etc. (and thats one of the secrets)...
BUT making wheels more abrasion resistant will also implicate that they get maybe lower rebounds and so also lower speed......so its searching for the right combinations etc etc.
Yepp, those letters and numbers tells what blend the prepolymer is and whats needed to add etc etc.
The hardness is messured with a "Shore"-meter, BUT Shore A will tell you NOTHING about the quality of the Urethane (put a shoremeter on a soft piece of wood and you also can messure lets say 86A, but wooden wheels will not work at all............) So the Shore grade tells you the hardness of a product, nothing more, nothing less......
The quality of the prepolymer in basic and the type of blends and mixtures will make the wheels more better, more rebound, or/and more abrasion resistent etc etc, Its just for what you need the polymer for.
Clear wheels are mostly made out of TDI witch is a less higher quality then the type of MDI blends we use.
To make it simpler: Clear PU is allways a less quality then Milky PU. Then its also so that HAND POURED wheels are much better then machined poured wheels........SOME BLENDS are IMPOSSIBLE to pour with machines (read: our blends...).....
felinaferoz
The name is Margaret
gooottt it.
could you say that hardness in wheels doesnt mean anything to how good the wheel might be?
could you say that hardness in wheels doesnt mean anything to how good the wheel might be?
TristanVesely
TristanVesely
well yea cuz u can get like 85a wheels at your local big 5, but the urethane is obviously shit. So i guess its based on the balance of the polyols and stuff right?
JonnyJonDogg
Member
whoa this threads so confusing lol
