Revisions for Rubber Bands
| 1 CURRENT | mathew |
January 20, 2012 23:10
| about 12 years ago
Size NumbersRubber bands come in a variety of sizes. A comprehensive chart is here.
We've found for making rubber band harnesses, size 64 is both extremely common and just the right size. A size 82 can replace a doubled size 64 in the harness, but 84's are generally only found around broccoli, not at the office supply store. ThicknessSize numbers don't give all the size info, as they don't account for thickness. Thickness can be judged based on the number of bands in a given pound of rubber bands. For instance, Alliance sells three types of size 64 bands-- the cheapest has 425 bands per pound, the mid range 320, and the high end 275 per pound Office Max and Staples sell size 64 rubber bands with 380 per pound MaterialRubber bands are generally made out of natural rubber mixed with a certain percentage of synthetic rubber, usually EPDM (ethylene propylene diene monomer), which is more durable through a range of temperatures, as well as resistant to UV and oxidization. Synthetic rubber bands aren't significantly stronger than natural rubber, but they do last longer. Less expensive rubber bands tend to have a higher natural rubber content. Pure EPDM bands are sold as 100% latex free, for those with latex allergies. I have not found black EPDM size 64 industrial-grade EPDM bands for sale, but those would be ideal for harnesses. Strength Testingsize 64 rubber bands were tested with a 15lb weight attached. Wear occurs mainly where rubber rubs against rubber. Rubber bands were also tested cold, after placement in a freezer. No performance difference was noted. However, I have noticed rubber bands weakening after exposure to temperatures below freezing. |
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| 0 | mathew |
January 19, 2012 04:08
| about 12 years ago
Size NumbersRubber bands come in a variety of sizes. A comprehensive chart is here.
We've found for making rubber band harnesses, size 64 is both extremely common and just the right size. A size 82 can replace a doubled size 64 in the harness, but 84's are generally only found around broccoli, not at the office supply store. ThicknessSize numbers don't give all the size info, as they don't account for thickness. Thickness can be judged based on the number of bands in a given pound of rubber bands. For instance, Alliance sells three types of size 64 bands-- the cheapest has 425 bands per pound, the mid range 320, and the high end 275 per pound Office Max and Staples sell size 64 rubber bands with 380 per pound MaterialRubber bands are generally made out of natural rubber mixed with a certain percentage of synthetic rubber, usually EPDM (ethylene propylene diene monomer), which is more durable through a range of temperatures, as well as resistant to UV and oxidization. Synthetic rubber bands aren't significantly stronger than natural rubber, but they do last longer. Less expensive rubber bands tend to have a higher natural rubber content. Pure EPDM bands are sold as 100% latex free, for those with latex allergies. I have not found black EPDM size 64 industrial-grade EPDM bands for sale, but those would be ideal for harnesses. Strength Testingsize 64 rubber bands were tested with a 15lb weight attached. Wear occurs mainly where rubber rubs against rubber. Rubber bands were also tested cold, after placement in a freezer. No performance difference was noted. However, I have noticed rubber bands weakening after exposure to temperatures below freezing. |
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