ASTM D1076 - 14

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

    Active Standard ASTM D1076 | Developed by Subcommittee: D11.22

    Book of Standards Volume: 09.01


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    Abstract

    This specification establishes the requirements for first grade concentrated natural rubber latex 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; and Category 4, centrifuged, or centrifuged and creamed, guayule latex, or other natural rubber latex, containing a specified dry weight amount of latex, with ammonia or other hydroxide, with other necessary preservatives and stabilizers. This specification applies to natural latex sources other than Hevea brasiliensis but does not apply to compounded latex concentrates. Materials shall be tested by analytical procedures that determine the following chemical properties an substances: total solids; dry rubber content; protein content; total alkalinity; viscosity; sludge content; coagulum content; KOH number; pH; mechanical stability; copper and manganese; density; volatile fatty acids; boric acid; and dry films.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    Significance and Use

    4.1 This specification denotes limits on the 4 categories of latex as defined in the scope and defines the test methods to use for the specified properties. These test methods may be used for production control or for referee purposes.

    1. Scope

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

    (A) Dry rubber content by definition and use is the acid coagulable portion of latex after washing and drying.
    (B) It is accepted that KOH numbers for boric acid preserved latices will be higher than normal, equivalent to the amount of boric acid in the latex.
    (C) Blue or gray color usually denotes iron contamination caused by improper storage in containers.

    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 µg total protein per gram dry weight of latex, with ammonia or other hydroxide, with other necessary preservatives and stabilizers.

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

    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:

     

    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.


    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


    ICS Code

    ICS Number Code 83.040.10 (Latex and raw rubber)

    UNSPSC Code

    UNSPSC Code 13101501(Latex rubber)


    Referencing This Standard

    DOI: 10.1520/D1076-14

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D1076-14, Standard Specification for Rubber—Concentrated, Ammonia Preserved, Creamed, and Centrifuged Natural Latex, ASTM International, West Conshohocken, PA, 2014, www.astm.org

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