ASTM D1076 : 21

Standard Specification for Rubber—Concentrated, Ammonia Stabilized, Creamed, and Centrifuged Natural Latex

Standard Details

1.1 This specification covers requirements for first grade concentrated natural rubber latex (see Table 1) of the following categories:

Category 1—Centrifuged Hevea natural latex stabilized with ammonia only.

Category 2—Creamed Hevea natural latex stabilized with ammonia only.

Category 3—Centrifuged Hevea natural latex stabilized with low ammonia.

Category 4—Centrifuged, or centrifuged and creamed, guayule latex, or other natural rubber latex, containing less than 200 µg total protein per gram dry weight of latex, with ammonia or other hydroxide.

Category 5—Centrifuged Hevea natural latex treated with aluminum hydroxide or by other means, stabilized with ammonia only containing less than 0.5 % non-rubber content.

1.2 This specification is not necessarily applicable to latices prepared, stabilized, or preserved by other methods, and shall not be construed as limiting the desirability or usefulness of other categories of latices. It does apply to natural latex sources other than Hevea brasiliensis but does not apply to compounded latex concentrates.

1.3 The analytical procedures applicable to the specifications are included and appear in the following order:

	Section
Sampling	6 and 7
Total Solids	8
Dry Rubber Content	9
Protein Content	10
Total Alkalinity	11
Viscosity	12
Sludge Content	13
Coagulum Content	14
KOH Number	15
pH	16
Mechanical Stability	17
Copper and Manganese	18
Density	19 – 31
Volatile Fatty Acids	32 – 36
Boric Acid	37
Dry Films	38
Precision for All Test Methods	39

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International StandardDetails, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.