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

Type 1-Centrifuged natural latex preserved with ammonia only or by formaldehyde followed by ammonia.

Type 2-Creamed natural latex preserved with ammonia only or by formaldehyde followed by ammonia.

Type 3-Centrifuged natural latex preserved with low ammonia with other necessary preservatives.

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

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

SectionSampling6 and 7Total Solids8Dry Rubber Content9Total Alkalinity10Viscosity11Sludge Content12Coagulum Content13KOH Number14pH15Mechanical Stability16Copper and Manganese17Density18-30Volatile Fatty Acids31-35Boric Acid36Dry Films37Precision for All Test Methods38

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