Answers.Body: <p>I cannot be certain about this, but I think it could be one of these two material options, 
  (1) Urethane: i.e. it's not rubber at all, and it is moulded, and not extruded. That's probably also why they have colour options. 
  (2) Butyl rubber: this is the rubber used in tyre tubes. I've used cut sections from inner bicycle tubes, and they stretch and seem to last forever. I'd be mildly surprised if I saw them in round section, or in colour, though.</p>
  
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Answers.CreationDate: 2020-10-24T20:21:17.380Z
Answers.Text: You do not need to answer, if you are just guessing.
Answers.UserDisplayName: Jonas Stein
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Answers.CreationDate: 2016-07-04T07:30:01.773Z
Answers.LastActivityDate: 2016-07-04T07:30:01.773Z
Answers.UserDisplayName: wizardofid
Body: <p>I have noticed that LEGO rubber bands (along with just about everything else LEGO) are fantastically durable.  They last ages without getting crusty and dying like most commonly available rubber bands.  They can even be held in stretched positions for extended lengths of time without showing any signs of wear, or even any noticeable hysteresis.</p>
  
  <p>So anyhow, what are they made of to make them so superior to common rubber bands?</p>
  
  <p>Clarifications:</p>
  
  <ul>
  <li>By "standard"/"common" rubber bands I mean those which are commonly available to purchase at the store, <a href="http://www.officedepot.com/a/products/855946/Office-Depot-Brand-Rubber-Bands-64/">like these</a>.</li>
  <li>I am talking about the newer "round cross section" type, not the old "square cross section" type which are more similar to standard rubber bands.  Part #'s <a href="http://www.bricklink.com/v2/catalog/catalogitem.page?P=x1106">x1106</a>, <a href="http://www.bricklink.com/v2/catalog/catalogitem.page?P=x90">x90</a>, <a href="http://www.bricklink.com/v2/catalog/catalogitem.page?P=x89">x89</a>, <a href="http://www.bricklink.com/v2/catalog/catalogitem.page?P=x37">x37</a>, and <a href="http://www.bricklink.com/v2/catalog/catalogitem.page?P=x71">x71</a>.</li>
  </ul>
  
Comments.ContentLicense: CC BY-SA 3.0
Comments.CreationDate: 2016-07-04T13:01:31.427Z
Comments.Text: http://bricks.stackexchange.com/questions/191/what-kind-of-plastic-are-lego-bricks-made-of quoted LEGO Group "Tires and elastic materials found in some LEGO sets are manufactured from Styrene-Butadiene Styrene (SBS), a material commonly found in vehicle mud guards and shoe soles."
Comments.UserDisplayName: chicks
Tags: <piece-information><rubber-bands>
Title: What are LEGO rubber bands made of?
UserDisplayName: PGmath
ThreadText: # What are LEGO rubber bands made of?
  
  (Asked by: username_0 on 2016-07-02)
  
  I have noticed that LEGO rubber bands (along with just about everything else LEGO) are fantastically durable. They last ages without getting crusty and dying like most commonly available rubber bands. They can even be held in stretched positions for extended lengths of time without showing any signs of wear, or even any noticeable hysteresis.
  
  So anyhow, what are they made of to make them so superior to common rubber bands?
  
  Clarifications:
  
  * By "standard"/"common" rubber bands I mean those which are commonly available to purchase at the store, [like these](http://www.officedepot.com/a/products/855946/Office-Depot-Brand-Rubber-Bands-64/).
  * I am talking about the newer "round cross section" type, not the old "square cross section" type which are more similar to standard rubber bands. Part #'s [x1106](http://www.bricklink.com/v2/catalog/catalogitem.page?P=x1106), [x90](http://www.bricklink.com/v2/catalog/catalogitem.page?P=x90), [x89](http://www.bricklink.com/v2/catalog/catalogitem.page?P=x89), [x37](http://www.bricklink.com/v2/catalog/catalogitem.page?P=x37), and [x71](http://www.bricklink.com/v2/catalog/catalogitem.page?P=x71).
  
  **Tags:** piece-information, rubber-bands
  
  > **Comments:**
  > **username_1**: http://bricks.stackexchange.com/questions/191/what-kind-of-plastic-are-lego-bricks-made-of quoted LEGO Group "Tires and elastic materials found in some LEGO sets are manufactured from Styrene-Butadiene Styrene (SBS), a material commonly found in vehicle mud guards and shoe soles."  
  
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  ## 1 answers
  
  ### Answer by username_2 on 2016-07-04. Score: 0
  
  I cannot be certain about this, but I think it could be one of these two material options,
  (1) Urethane: i.e. it's not rubber at all, and it is moulded, and not extruded. That's probably also why they have colour options.
  (2) Butyl rubber: this is the rubber used in tyre tubes. I've used cut sections from inner bicycle tubes, and they stretch and seem to last forever. I'd be mildly surprised if I saw them in round section, or in colour, though.
  
  > **Comments:**
  > **username_3**: You do not need to answer, if you are just guessing.  
  
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