1.1This 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.
1.2This 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.
1.3The analytical procedures applicable to the specifications are included and appear in the following order:
Section Sampling 6 and 7 Total Solids 8 – 17 Dry Rubber Content 18 Protein Content 19 Total Alkalinity 20 Viscosity 21 Sludge Content 22 Coagulum Content 23 KOH Number 24 pH 25 Mechanical Stability 26 Copper and Manganese 27 Density 28 – 40 Volatile Fatty Acids 41 – 45 Boric Acid 46 Dry Films 47 Precision for All Test Methods 48
1.4The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
