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Description of ASTM-D1076 2014ASTM D1076-14Historical Standard: Standard Specification for Rubber—Concentrated, Ammonia Preserved, Creamed, and Centrifuged Natural LatexASTM D1076Scope 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:
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. Keywords ICS Code ICS Number Code 83.040.10 (Latex and raw rubber) DOI: 10.1520/D1076-14 The following editions for this book are also available...
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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