$8.24
DESCRIPTION-> Click "Learn more about this item" for article & instructions!
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This is a large tire regrind crumb. The particle sizes are mixed between approximately 500 micron to approximately 3500 micron. We have 4 particle sizes (mesh or micron sizes) of crumb rubber: 150-500 micron (approx), 20-100 micron (approx), and 150-750 micron (approx). The 150-500 and 20-100 are soft and flexible. The 150-750 is a higher durometer (harder) rubber. This is fairly soft and pretty clean. There's not much cord and no metal.
This makes a very good general purpose crumb for latex mold making because of the mixed particle sizes. Get the first coat of pure latex (no crumb added) against your positive to get a smooth mold surface and then used this with succeeding coats. It lowers latex costs, and also helps cut down on the shrinkage that natural latex mold making rubber undergoes. Using just this 500-3500 grade does have the advantage of being the only grade you need to buy, but you really need some smaller particles. If you're planning on making many latex molds, you might want to get small quantities of each of the available grades for testing to determine what works best for the types of things you're molding.
People who use latex for molds also use materials other than crumb rubber to save money and alter the properties of the latex mold. Layers of cheesecloth applied and "wetted" (like fiberglass in a polyester part) in layers along with the latex is a well known technique.
One of the reasons that "crumb rubber" (tire regrind) works well with natural latex is that tires themselves are made with natural latex (plus large amounts of carbon black, metal and nylon cord, and some synthetic rubber) and so crumb rubber is very compatible. You can also get away with using it to extend some urethane mold making rubber (you should test a small quantity mix using your particular urethane first). The cost savings when you use it with urethanes are much more than with latex. Urethane rubber is very expensive these days. You should not use crumb rubber with silicone mold making rubber. Platinum cured silicone is very sensitive to sulfur containing materials (amongst other materials). Tin cured silicone is less sensitive but I still think it's very unlikely you'd find a tin cured silicone that would accept it. (I have used old silicone molds ground up by a meat grinder as an extender "crumb" for new silicone molds- it works for tin cured silicones but not platinum).
Crumb rubber is being used these days to make anti-skid surfaces and protective coatings. This is a good grade to use for that purpose because of the mixed particle sizes. There are many sources on the internet for how to do this. Tire regrind crumb is also added to new rubber made into new tires, as a recycling measure to reuse some of the millions of waste tires that are generated each year. Crumb rubber is black but it's also "green" to recycle all those tires we use. One major use for it is in asphalt that is rubberized with crumb.
Wikipedia has articles on crumb rubber, tire regrinding, rubberized asphalt, and the higher quality micronized crumb rubber (which I also sell):
https://en.wikipedia.org/wiki/Crumb_rubber
https://en.wikipedia.org/wiki/Tire_recycling
https://en.wikipedia.org/wiki/Rubberized_asphalt
https://en.wikipedia.org/wiki/Micronized_rubber_powder
Just a short excerpt:
"Rubberized asphalt is the largest market for crumb rubber in the United States, consuming an estimated 220 million pounds (100 kt), or approximately 12 million tires annually. Crumb rubber is also used as ground cover under playground equipment, and as a surface material for running tracks and athletic fields."
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Nov 5, 2024
Great Customer Service. Nice product.
Azure Hover
Apr 18, 2024
Perfect for soles on my shoes I'm making
Robin Draper
Apr 18, 2024
Just what I needed to pit on my viking shoes I'm making, to protect the soles and extend their life.
Robin Draper
Feb 3, 2024
Works great for what i need! Thanks!! Ill be back
Nate
Sep 22, 2023
Great, worked great for my project.
Carol Murphy
