Difference between revisions of "Rubber (synthetic)"
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Revision as of 07:48, 2 July 2020
Description
Any man-made Elastomer. The development of synthetic rubbers was stimulated when rubber imports ceased in 1941 due to Japanese occupation in southeast Asia. Within 3 years, US manufacturers had developed over nine types of elastomers. Most age better than natural rubber but are still susceptible to degradation by Ozone and ultraviolet light. All rubbers must be chemically vulcanized to form an stable product. The unsaturated materials are vulcanized with Sulfur while others are vulcanized with peroxide, metallic oxide, or diisocyanates.
Synonyms and Related Terms
synthetic rubber; caucho sintético (Esp.); caoutchouc synthétique (Fr.); gomma sintetica (It.); borracha sintética (Port.)
Examples of Synthetic Rubbers
Table of Selected polymers belonging to this polymer class (links are for CAMEO pages)
| Polymer name | Properties of Concern |
|---|---|
| Rubber, Natural | Vulcanized rubber may emit sulfur fumes that will tarnish metals and stain organic materials |
| Polybutadiene (Buna) | Compounded with a wide variety of materials |
| Polystyrene | Compounded with a wide variety of materials |
| Nitrile rubber (NBR) | Some NBR are blended with PVC and contain chloride |
| Styrene-butadiene rubber (SBR) | Tendency to crawl; Compounded with a wide variety of materials |
| Acrylonitrile butadiene styrene (ABS) | Compounded with a wide variety of materials |
| Ethylene propylene rubber (EPR) | |
| Ethylene propylene diene (EPDM) | May be crosslinked with other products with sulfur vulcanization |
| Butyl rubber (Isoprene) | |
| Neoprene (Polychloroprene) | Chlorinated, may off-gas acids |
| Polysulfide | May contain PCB’s, can cause damage to metals when in contact with stainless and carbon steels |
| Polyurethane (Spandex) | Problematic class of materials |
| Silicone Rubber | Off-gassing depends on the initial curing system, platinum based cures have no offgassing; condensation cures can produce acid, neutral or basic chemicals during curing; peroxide cures can produce ketones or chlorinated aromatic chemicals as the material ages and breaks down. |
Sources Checked for Data in Record
- Contribution: Molly McGrath
- Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988
- M.Kaufman, The First Century of Plastics, The Plastics and Rubber Institute, London, 1963
- Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002