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| ABS plastic degradation (brittle) - HP34401A (circa 1992) |
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| tooki:
--- Quote from: kosine on June 14, 2022, 02:11:39 pm ---ABS doesn't actually contain plasticisers. It's a terpolymer made from three monomers. The acrylonitrile is basically a cyanide group, the styrene is a large benzene ring (you can see why they changed the names!) A copolymer of just those two is known as SAN, and it's commonly used as clear plastic in a lot of kitchenware. The drawers in your freezer are probably SAN. --- End quote --- Are there any common plastics beside PVC that rely on plasticizers for flexibility? I don’t think I’ve ever heard of plasticizers used in any other plastic. (Though I am aware of plasticizer migration damaging other plastics, I’m only wondering about the deliberate use.) |
| bicycleguy:
Got tired of loosing screws on a fold-up plastic camping table. Decided to 'Lock-Tight' the metal screws to their corresponding nuts. Left it overnight in the garage and the next day it lay on the floor in hundreds of pieces. There was concentric circular cracks 1 to ~6 inches from every bolt with radial cracks about 45degrees around each, so lots of pie slice pieces and large chunks with 6 inch arcs or holes. But the lock tight didn't fail ^-^. All the nuts and bolts were laying on the floor by themselves or attached to some aluminum struts. |
| jfiresto:
--- Quote ---Approximately 90% of all plasticizers are used in polyvinyl chloride, or PVC.... Plasticizers are also used in other polymers like acrylics, PET, polyolefins, and polyurethanes. --- End quote --- From https://www.osborneindustries.com/news/what-do-plasticizers-do/ |
| james_s:
--- Quote from: bicycleguy on June 14, 2022, 06:47:25 pm ---Got tired of loosing screws on a fold-up plastic camping table. Decided to 'Lock-Tight' the metal screws to their corresponding nuts. Left it overnight in the garage and the next day it lay on the floor in hundreds of pieces. There was concentric circular cracks 1 to ~6 inches from every bolt with radial cracks about 45degrees around each, so lots of pie slice pieces and large chunks with 6 inch arcs or holes. But the lock tight didn't fail ^-^. All the nuts and bolts were laying on the floor by themselves or attached to some aluminum struts. --- End quote --- Yikes, I wonder what happened there, and what it was made of. Wish you had a picture of that. |
| lugaw:
--- Quote from: bicycleguy on June 14, 2022, 06:47:25 pm ---Got tired of loosing screws on a fold-up plastic camping table. Decided to 'Lock-Tight' the metal screws to their corresponding nuts. Left it overnight in the garage and the next day it lay on the floor in hundreds of pieces. There was concentric circular cracks 1 to ~6 inches from every bolt with radial cracks about 45degrees around each, so lots of pie slice pieces and large chunks with 6 inch arcs or holes. But the lock tight didn't fail ^-^. All the nuts and bolts were laying on the floor by themselves or attached to some aluminum struts. --- End quote --- My experience on plastic degrading like that is when I collected tootbrush when checking in to hotels so I can use it in the shop for cleaning. They are so cheap ( probably handles are made from acrylic) they crumble to pieces when exposed to any kind of solvent. The more expensive toothbrush dont crumble like it. |
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