1. Scope

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 preserved with ammonia only or by formaldehyde followed by ammonia.

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

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

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

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 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:

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

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1278 Test Methods for Rubber from Natural Sources--Chemical Analysis

D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries

D5712 Test Method for Analysis of Aqueous Extractable Protein in Natural Rubber and Its Products Using the Modified Lowry Method

D6499 Test Method for The Immunological Measurement of Antigenic Protein in Natural Rubber and its Products

E70 Test Method for pH of Aqueous Solutions With the Glass Electrode

Keywords

Acidity, alkalinity, pH--rubber materials/applications; Boric acid content; Coagulum content; Density--rubber; Dry rubber content; Fatty acids content; KOH number; Mechanical stability; Natural rubber (NR) latex--specifications; Rubber--specifications; Sludge; Solids content; Viscosity--rubber; Volatile fatty acids content ;

ICS Code

ICS Number Code 83.040.10 (Latex and raw rubber)

DOI: 10.1520/D1076-06

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