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ASTM International, 07/01/2014
Publisher: ASTM
File Format: PDF
$32.00$65.00
Published:01/07/2014
Pages:13
File Size:1 file , 150 KB
Note:This product is unavailable in Russia, Ukraine, Belarus
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 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
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