
Standard Specification for Rubber-Concentrated, Ammonia Preserved, Creamed, and Centrifuged Natural Latex
出版:American Society for Testing and Materials

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CONTAINED IN VOL. 09.01, 2006Describes requirements for first grade concentrated natural rubber latex of the following categories:Category 1 - Centrifuged Hevea natural latex preservedwith ammonia only or by formaldehyde followed by ammonia.Category 2 - Creamed Hevea natural latex preserved withammonia only or by formaldehyde followed by ammonia.Category 3 - Centrifuged Hevea natural latex preservedwith low ammonia with other necessary preservatives.Category 4 - Centrifuged, or centrifuged and creamed, guayulelatex, or other natural rubber latex, containing less than200 [mu]g total protein per gram dry weight of latex, withammonia or other hydroxide, with other necessary preservativesand stabilizers.
Supersedes ASTM D 640.
(02/2002)