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ASTM D 1076 : 2015 : REDLINE

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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

Available format(s)

PDF

Superseded date

30-06-2021

Language(s)

English

Published date

15-12-2015

CONTAINED IN VOL. 09.01, 2016 Describes 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. Category 4 - Centrifuged, or centrifuged and creamed, guayule latex, or other natural rubber latex, containing less than 200 [mu]g total protein per gram dry weight of latex, with ammonia or other hydroxide, with other necessary preservatives and stabilizers.

1.1This 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.

1.2This 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.

1.3The 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

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

Committee
D 11
DevelopmentNote
Supersedes ASTM D 640. (02/2002)
DocumentType
Redline
Pages
16
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy

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