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:
|Sampling||6 and 7|
|Dry Rubber Content||9|
|Copper and Manganese||17|
|Volatile Fatty Acids||31-35|
|Precision for All Test Methods||38|
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.
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
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 Number Code 83.040.10 (Latex and raw rubber)
ASTM International is a member of CrossRef.
Citing ASTM Standards
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