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ASTM International, 06/01/2021
Publisher: ASTM
File Format: PDF
$38.00$76.00
Published:01/06/2021
Pages:13
File Size:1 file , 190 KB
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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 stabilized with ammonia only.
Category 2'''Creamed Hevea natural latex stabilized with ammonia only.
Category 3'''Centrifuged Hevea natural latex stabilized with low ammonia.
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.
Category 5'''Centrifuged Hevea natural latex treated with aluminum hydroxide or by other means, stabilized with ammonia only containing less than 0.5 % non-rubber content.
1.2''This specification is not necessarily applicable to latices prepared, stabilized, 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.
1.5''This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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