International Organization for Standardization (ISO)
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ISO 7664:2000
Scope
This International Standard provides information on the most suitable conditions for the storage of raw natural and raw synthetic rubber delivered in the form of bales.
For rubber delivered in the form of powder, loose crumb or pellets, extra care should be taken because of the far greater exposed surface area. In addition, "particulate" rubber can agglomerate under the influence of elevated temperature and/or pressure.
ISO 7664:2000 history
2000ISO 7664:2000 Rubber, raw, natural and raw synthetic - General guidance on storage